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  • Ecology  (127)
  • Chemistry  (27)
  • Fisheries  (27)
  • Analytical Chemistry and Spectroscopy
  • Industrial Chemistry
  • Man/System Technology and Life Support
  • Ambleside, UK  (162)
  • 2020-2022  (162)
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  • 1
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    Institute of Freshwater Ecology | Ambleside, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10997 | 1256 | 2013-03-26 13:47:47 | 10997 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: This is the report on the Cheshire Meres: a Water Quality Enigma by the Institute of Freshwater Ecology from June 1993. The aim of the proposal is to use a well-tested condition-check on key Cheshire Meres, looking at the present nutrient-state and the seasonal structure and relative species-abundances of the phytoplankton. This information will enable the NRA to make some overall appraisal of the advance or otherwise, in trophic condition and its impact upon the perception, use and management of these nationally important sites. The report contains section on the objectives, strategy, timescale, staff and financial of the proposal, plus an appendix with information about the Windermere Profiler and the CV of the Project Leader.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: +2 appendices
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Cheshire Meres ; Survey ; Sampling methodology ; Nutrient state ; Seasonal Structure ; Phytoplankton
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 2
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    Institute of Freshwater Ecology | Ambleside, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10996 | 1256 | 2013-10-27 12:00:31 | 10996 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-26
    Beschreibung: This is a report on the Analysis of Data and a Prioritisation of Sites at the Cheshire Meres by the Institute of Freshwater Ecology.The report addresses data collected by the Agency for 24 basin sites in Cheshire. At least two samples were collected from each site, though not simultaneously. Sites were visited in May/June and in November. The determinands are standard and they included: water, temperature, conductivity, pH, DO, fractional white light penetration, TSS, chlorophyll, TP, ortho-phosphate, nitrate-, nitrite-, ammonium and silicate. Though concentrations were often higher than for other lakes in the region, rather exceeding criteria for classification as eutrophic lakes, the results confirmed that the series of lakes is, naturally, highly eutrophic and nothing in the present data differs so far from expectation that is persuasive that the ecosystems are reacting adversely to environmental stress. The data set is review and summarised, site-by-site, in an appendix. The grounds for prioritisation are discussed. Whether or not this preferred prioritised option is adopted, the Agency is recommended to review the way it carries out monitoring. The determinands and the sampling frequency need to be geared to the information that is required.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Cheshire Meres ; Ecological monitoring ; Eutrophic lake ; Prioritisation ; Strategies ; Water quality ; Environmental stress
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 27
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  • 3
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    Institute of Freshwater Ecology | Ambleside, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10970 | 1256 | 2013-03-26 13:54:01 | 10970 | Environment Agency, UK (Freshwater Biological Association)
    Publikationsdatum: 2021-06-25
    Beschreibung: This is the report on the Effects of Water Quality in the Bassenthwaite Lake on Anglers Catches of Salmon and Sea-trout in the River Derwent April 1993 by the Institute of Freshwater Ecology. An analysis of the catch statistics for salmon and sea-trout in the Rivers Derwent and Cocker was undertaken in relation to available information on the algal water quality in Bassenthwaite Lake to test the hypothesis that poor catch returns were associated with a deterioration of water quality within the lake. Analysis of the catch statistics failed to reveal any correlation between water quality and catch returns for either species of fish and it is concluded that any water deterioration in Bassenthwaite Lake has not caused any major damage to the salmon and sea trout fisheries of the Derwent/Cocker system. This conclusion is supported by the analysis of the Windermere/Leven and Crake system, where no correlation could be found between lake water quality and downstream catches of migratory salmonid fish. However, the possibility still exists and such an effect might be detected by further field work on the macroinvertebrates and on the composition of potential salmonid spawning in the area.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Bassenthwaite Lake ; River Derwent ; River Cocker ; Water quality ; Fish catch statistics ; Pollution effects ; Environmental monitoring
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 46
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  • 4
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5096 | 1256 | 2011-09-29 15:24:47 | 5096 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: At high stream discharges salmonid eggs can he displaced from the gravel and may drift downstream. It has been suggested that developing salmonid eggs may be killed by ”physical shock”, especially during the period before ”eyeing”. Similarly, a progress report by the International Pacific Salmon Fisheries Commission (1966) states that salmonid eggs are most sensitive during the period between fertilisation and blastopore closure. However, it would seem unlikely that this sensitivity actually begins at the time of fertilisation because, in nature, a period, perhaps measured in hours, must occur during which the newly-fertilised eggs are exposed to physical shock during the deposition of gravel over them as a result of the cutting activity of the female fish. The present report describes simple channel experiments designed to answer the two questions: 1. After release of eggs from the gravel, does the process of drifting downstream, which implies some physical shock through movement and impact, decrease the survival of salmonid eggs? 2. Is the survival rate-influenced by the stage of development of the eggs?
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Freshwater ecology ; Rivers ; Freshwater fish ; Life cycle ; Channels ; Experimental research ; Fish eggs ; England ; Grassholme
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 33
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  • 5
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5092 | 1256 | 2011-09-29 15:25:26 | 5092 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: Aspects of reported nutrient levels and their ecological implications for Malham Tarn are discussed. Discussion centres upon the data given here as appendices, involving possible evidence of a long-term increase in the concentrations of some nutrients (especially nitrate) of significance for the Tarn's ecology and conservation. Further comparative tests of some methods of chemical analysis employed in obtaining those data are reported.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater ecology ; Freshwater lakes ; Nutrients (mineral) ; Nitrates ; Phosphorus ; Alkalinity ; Methodology ; Ultraviolet radiation ; Hydrology ; England ; Malham Tarn
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 42
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  • 6
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5097 | 1256 | 2011-09-29 15:24:43 | 5097 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: It is of value to know the approximate distance of travel at different stream discharges and/or water velocities, of salmonid eggs which have been displaced from redds by spates. This report describes studies in 20 m of stream channel upstream of the fish trap in Dubby Sike. Observations were made on the relation- ships between discharge and water depth and velocity and also on the relationships between water velocity and the settlement of artificial trout eggs. The main aim was to test the hypothesis that, at any given water velocity, eggs would drift smaller distances in a natural stream than in the experimental channels.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Freshwater ecology ; Rivers ; Freshwater fish ; Channels ; Experimental research ; Fish eggs ; England ; Grassholme
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 7
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5110 | 3949 | 2011-09-29 15:23:55 | 5110 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: An article detailing some of the conclusions of the salmon investigation undertaken by the author, on the River Eden and its tributaries, for the previous few years. It is proposed that seasonal changes in young salmon growth are related to water temperature variation. A figure is included showing length of fish compared to the average temperature of water in the River Eden over a two year duration. The article describes comparative work undertaken to date between three streams within the Thurso watershed and the River Eden. A table is included showing the average size of fish in each of the watercourses compared. Laboratory experiments on the effects of temperature on young salmon are outlined, as well as investigative work undertaken into the realtionship between fish scales and fish length.
    Schlagwort(e): Biology ; Ecology ; Fisheries ; Water temperature ; Freshwater fish ; Length ; Scales ; Seasonal variations ; Feeding ; Temperature effects ; Annual reports ; Salmo salar ; England ; Scotland
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 51-55
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  • 8
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5109 | 3949 | 2011-09-29 15:23:53 | 5109 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater molluscs ; Aquatic insects ; Invertebrate larvae ; Aquatic organisms ; Annual reports ; Corixidae ; Coleoptera ; England ; Lake District
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 47-51
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  • 9
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5124 | 3949 | 2011-09-29 15:23:13 | 5124 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: A review article looking at the type of information requirements commonly shared by scientists and their use of traditional information services. Areas covered include primary requirements of IFE (Institute of Freshwater Ecology) staff, pure versus applied research, informal and personal sources of information, and traditional library and information services. It goes on to describe how research into information systems and technology may improve the wider accessibility and use of information to the scientific community. Technologies covered include online databases, telecommunications, gateways, expert systems, optical technology and applications of CDROM.
    Schlagwort(e): Ecology ; Environment ; Information Management ; Freshwater ecology ; Research institutions ; Research ; Information scientists ; Information services ; Annual reports ; England ; Lake District
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 55-67
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  • 10
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5237 | 1256 | 2011-09-29 15:13:37 | 5237 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This report covers the period April to September, 1989. During this period sampling of invertebrates has concentrated on planktonic animals and those associated with one of the dominant macrophytes in the system, Nuphar lutea, the yellow water lily, since these are particularly important in the diets of larval and juvenile cyprinid fish. A proportion of samples has been partly analysed and some preliminary data are presented here.
    Schlagwort(e): Ecology ; Environment ; Limnology ; Aquatic plants ; Plankton ; Biological sampling ; Invertebrate larvae ; Pesticides ; England ; Godmanchester
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 11
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5238 | 1256 | 2011-09-29 15:13:42 | 5238 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This report presents five batches of data which have been despatched to the Joint Research Centre, Ispra. The data as been allocated to various ECDIN (Environmental Chemicals Data and Information Network) files. The data comprises environmental chemicals in the freshwater environment, taking in paricular consideration: aquatic toxicity, bioaccumulation, metabolism and elimination biodegradation.
    Schlagwort(e): Chemistry ; Ecology ; Limnology ; Data ; Data processing ; Data collections ; Chemical compounds ; Toxicity ; Bioaccumulation ; Biodegradation ; Metabolism
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 8
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  • 12
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5236 | 1256 | 2011-09-29 15:13:22 | 5236 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The plant Crassula helmsii (Kirk) Cochayne, was likely to become widely distributed and to dominate many damp and wet areas of nature reserves, recreational waters and agricultural drainage of Britain. The aim of this report was to study Australian Swamp Stonecrop in its natural habitat where it is in balance with its environment. This contrasts with its rapid and widespread distribution in the U.K. where its growth interferes with the use of fisheries and amenity lakes but also reduces the value of nature reserves and sites of special scientific interest by suppressing native flora. It was proposed to observe its growth at a variety of sites over its natural distribution and to include some environmental factors, e.g. water-level, water-chemistry (nutrients, acidity and alkalinity), frost-tolerance, salinity, with the help of portable sensors, locally-available services or data. 8 weeks of travel in Australia allowed time to study the plant in its natural habitat including the coastal areas of the southern half of the continent i.e . Western Australia, South Australia, New South Wales, Victoria, Tasmania and southern Queensland. The overall objective was to determine the environmental range by visits to selected sites of Crassula helmsii over its geographic range.
    Schlagwort(e): Conservation ; Ecology ; Limnology ; Plant control ; Plant populations ; Aquatic plants ; Introduced species ; Australia ; Crassula helmsii
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 33
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  • 13
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5275 | 1256 | 2011-09-29 15:10:37 | 5275 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This annotated bibliography covers literature to the end of November 1977, and includes references to samplers that could be used for the rapid removal of benthic invertebrates from natural substrata of rivers and streams. Marine samplers which have been, or could be, used in freshwater. Coverage of Russian literature is incomplete, although a selection of recent and important references are included. The references are arranged under the following headings, Reviews; Nets and quadrat samplers; Scoops, shovels and dredges; Grabs; Corers; Suction and air-lift samplers; Electroshocking samplers; Efficiencies and comparisons; and Samplers from catalogues. There is an index to samplers (by the common name) and an author index.
    Beschreibung: Supplement to this Bibliography held as http://aquaticcommons.org/5410/
    Schlagwort(e): Ecology ; Limnology ; Samplers ; Invertebrates ; Bibliographies
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 61
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  • 14
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5282 | 1256 | 2011-09-29 15:11:34 | 5282 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Distribution maps were included in the second edition of the F.B.A. Scientific Publication on British freshwater leeches (Mann 1964). When that publication was extensively revised and enlarged to include a review of the literature on the ecology of leeches (Elliott & Mann 1979), it was decided that new maps should be published separately. The original maps were based on 1097 records whereas 4198 records were used for the new maps. The total British Isles list comprises sixteen species, thirteen genera and four families of leeches.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Distribution records ; Ecological distribution ; Maps ; Freshwater organisms ; Hirudinea
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 15
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5284 | 1256 | 2011-09-29 15:11:41 | 5284 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: A new listing of published scientific contributions from the Freshwater Biological Association (FBA) and its later Research Council associates – the Institute of Freshwater Ecology (1989–2000) and the Centre for Ecology and Hydrology (2000+) is provided. The period 1929–2006 is covered. The compilation extends an earlier list assembled by in 1979.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Bibliographies ; Freshwater sciences ; Hydrobiology ; Hydrology ; Limnology
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 161
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  • 16
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5287 | 1256 | 2011-09-29 15:12:00 | 5287 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Restoration of water-bodies from eutrophication has proved to be extremely difficult. Mathematical models have been used extensively to provide guidance for management decisions. The aim of this paper is to elucidate important problems of using models for predicting environmental changes. First, the necessity for a proper uncertainty assessment of the model, upon calibration, has not been widely recognized. Predictions must not be a single time trajectory; they should be a band, expressing system uncertainty and natural variability. Availability of this information may alter the decision to be taken. Second, even with well-calibrated models, there is no guarantee they will give correct projections in situations where the model is used to predict the effects of measures designed to bring the system into an entirely different ”operating point”, as is typically the case in eutrophication abatement. The concept of educated speculation is introduced to partially overcome this difficulty. Lake Veluwe is used as a case to illustrate the point. Third, as questions become more detailed, such as ”what about expected algal composition”, there is a greater probability of running into fundamental problems that are associated with predicting the behaviour of complex non-linear systems. Some of these systems show extreme initial condition sensitivity and even, perhaps, chaotic behaviour, and are therefore fundamentally unpredictable.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Phytoplankton ; Freshwater lakes ; Models ; Growth ; Modelling ; Equations ; Bacteria ; Prediction ; Netherlands ; Veluwemeer Lake
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 44-58
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  • 17
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5285 | 1256 | 2011-09-29 15:11:44 | 5285 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The ”Vollenweider model” is a sophisticated mathematical statement about the long-range behaviour of (mainly temperate) lakes and their ability to support phytoplankton chlorophyll. Misapplication of the model, against which Vollenweider himself warned, has led to many misconceptions about the dynamics of plankton in lakes and reservoirs and about how best to manage systems subject to eutrophication. This contribution intends to frame the most important issues in context of the phosphorus- loading and phosphorus-limitation concepts. Emphasis is placed on the need to distinguish rate-limitation from capacity-limitation, to understand which is more manageable and why, to discern the mechanisms of internal recycling and their importance, and to appreciate the respective roles of physical and biotic components in local control of algal dynamics. Some general approaches to the management of water quality in lakes and reservoirs to eutrophication are outlined.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Phytoplankton ; Models ; Phosphorus ; Ecosystem management ; Nutrients (mineral) ; Plant growth ; Growth regulators ; Freshwater lakes
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 4-29
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  • 18
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5289 | 1256 | 2011-09-29 15:08:12 | 5289 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Results from long-term investigations on biomanipulation show that indirect effects are at least as important as direct effects are for the stability of biomanipulation. Three types of indirect effects can be distinguished: (1) a change in quantity or quality of the resource base, (2) behavioural change of the prey, and (3) development of anti-predator traits. Although indirect effects of type (2), (e.g. a change in the pattern of vertical migration of zooplankton), and type (3), (e.g. development of helmets and neck teeth in Daphnia), are important mechanisms, the most essential indirect effects regarding biomanipulation belong to type (1). An example of the latter will be demonstrated: the complex of indirect effects of enhanced grazing by large herbivores on the phosphorus metabolism of the lake. It is concluded that control of the indirect effects is absolutely necessary to stabilize biomanipulation measures, but this is much more difficult than the control of direct effects and needs deeper insights into the structuring mechanisms of food webs. Proper management of fish stocks, in combination with the control of phosphorus load and/or the physical conditions, seems to be the most promising way of controlling the indirect effects of biomanipulation.
    Schlagwort(e): Ecology ; Limnology ; Eutrophication ; Freshwater lakes ; Biomanipulation ; Water quality control ; Food webs ; Phosphorus
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 82-93
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  • 19
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5290 | 1256 | 2011-09-29 15:08:14 | 5290 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: In the mesotrophic-eutrophic Saidenbach Reservoir in Saxony, the nanoplankton and cyanobacteria have increased at the expense of diatom dominance, due to a doubling of the external phosphorus load in the last 15 years. However, the phosphorus sedimentation flux is still very high (up to 80% of the input), corresponding to more than 2 g m2 d-1 in terms of dry weight. There is a strong correlation between the abundance of diatoms in the euphotic zone and their sedimentation flux (with a delay of about 2 weeks). Only about 25% of the deposited material could be clearly attributed to plankton biomass; the remainder resulted from flocculation and precipitation processes or directly from the inflow of clay minerals. The ash content of the deposited material was high (73%). Thus the sedimentation flux can be considered to operate as an internal water-treatment/oligotrophication process within the lake. The neighbouring Neunzehnhain Reservoir still has a very clear water with a transparency up to 18 m depth. Though the sediment was not much lower than Saidenbach sediment in total phosphorus and total numbers of bacteria, sulphide was always absent and the ratio of Fe 2+ to Fe 3+ was very low in the upper (0- 5 cm) layer. Thus the external and internal phosphorus loads do not attain the critical level necessary to induce a ”phosphorus - phytoplankton” feedback loop.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Freshwater lakes ; Water quality control ; Phosphorus ; Water reservoirs ; Phytoplankton ; Growth ; Sedimentation ; Sediment composition ; Germany
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 94-106
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  • 20
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5295 | 1256 | 2011-09-29 15:07:49 | 5295 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: In a small lake, intermittent destratification was installed after several other physico-chemical and physical in-lake therapy measures (phosphorus immobilization, permanent destratification) had been tested without great success. If an aerobic sediment-water interface can be maintained, intermittent destratification removes cyanobacteria and prevents optimal development of other members of the photoautotrophic plankton. During growing seasons, increasing abundances of small-bodied herbivores (Bosmina) and Daphnia may have accounted for relatively low phytoplankton biomass as well. Intermittent destratification is a very fast-working in-lake measure and seems to be applicable even in relatively shallow lakes (〈 15 m), in which permanent destratification seems to be risky.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Destratification ; Ecosystem management ; Water quality control ; Phosphorus ; Eutrophic lakes ; Inhibitors ; Phytoplankton ; Zooplankton ; Biomass ; Germany ; Fischkaltersee
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 163-184
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  • 21
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5298 | 1256 | 2011-09-29 15:07:47 | 5298 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This chapter summarises the meeting, entitled ”Eutrophication: Research and Application to Water Supply”. The general feeling was that academic research on the process of eutrophication had progressed significantly over the past decade, but there had been little contact with the water managers, i.e. those whose work was at the sharp end of dealing with the associated problems. This chapter summarises the sessions held by experts in the field.
    Schlagwort(e): Ecology ; Limnology ; Eutrophication ; Algal blooms ; Inland waters ; Water management ; Phytoplankton ; Conferences
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 214-217
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  • 22
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5292 | 1256 | 2011-09-29 15:08:07 | 5292 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Since 1989, intensive studies have been made on a relatively new (1983-84) oligotrophic reservoir and its pre-reservoir in the Black Forest. This paper briefly reports on the hydrochemistry, especially annual variations in phosphorus loadings, and the seasonal development of phytoplankton in 1989 and 1990.
    Schlagwort(e): Ecology ; Limnology ; Eutrophication ; Freshwater lakes ; Water reservoirs ; Limnological surveys ; Phosphorus ; Biomass ; Phytoplankton ; Oligotrophic lakes ; Germany ; Kleine Kinzig Reservoir
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 112-118
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  • 23
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5291 | 1256 | 2011-09-29 15:07:52 | 5291 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Natural calcite precipitation in lakes is a well-known control mechanism of eutrophication. In hard-water lakes, calcite deposits on the flat bottoms of shallow lakes and near the shores of deeper lakes resulted from biogenic decalcification during the millenia after the last glacial period. The objective of a new restoration technology is to intensify the natural process of precipitation by utilizing the different qualities of calcareous mud layers. In a pilot experiment in Lake Rudower See, East Germany, phosphorus-poor deeper layers of the sediments were flushed out and spread over the phosphorus-rich uppermost sediments, to promote the co- precipitation of calcite with phosphorus from the water-column.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Freshwater lakes ; Phosphorus ; Calcitization ; Algal blooms ; Calcite ; Sedimentation ; Germany
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 107-111
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  • 24
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5301 | 1256 | 2011-09-29 15:07:11 | 5301 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The cyanobacteria that cause problems in water supply are principally the colonial forms that are buoyed up by gas vesicles. The success of these organisms is due, in part, to their gas vesicles, which enable them to perform vertical migrations or to maintain themselves in the euphotic zone. The gas vesicles are also the root cause of the problems. In calm periods they cause the cyanobacteria to float to the water surface forming noxious scums, and they may prevent the colonies from sedimenting in water treatment plants. Gas vesicles are hollow, gas-filled structures; they are rigid but can be collapsed by the application of pressure. Their critical collapse pressure is influenced by their dimensions, which vary in different organisms. Gas vesicles are formed by the assembly of two types of protein, which determine their mechanical and physical properties. Methods for collapsing gas vesicles in natural populations of cyanobacteria will be considered. They may have application to the control of cyanobacteria in water supply.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Gases ; Buoyancy ; Algae ; Bacteria ; Photosynthesis ; Growth ; Competition
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 150-162
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  • 25
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5293 | 1256 | 2011-09-29 15:08:09 | 5293 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Esthwaite Water is the most productive or eutrophic lake in the English Lake District. Since 1945 its water quality has been determined from weekly or biweekly measurements of temperature, oxygen, plant nutrients and phytoplankton abundance. The lake receives phosphorus from its largely lowland-pasture catchment, sewage effluent from the villages of Hawkshead and Near Sawrey, and from a cage-culture fish farm. From 1986 phosphorus has been removed from the sewage effluent of Hawkshead which was considered to contribute between 47% and 67% of the total phosphorus loading to the lake. At the commencement of phosphorus removal regular measurements of phosphorus in the superficial 0-4 cm layer of lake sediment were made from cores collected at random sites. Since 1986 the mean annual concentration of alkali-extractable sediment phosphorus has decreased by 23%. This change is not significant at the 5% level but nearly so. There has been no marked change in water quality over this period. Summer dominance of blue-green algae which arose in the early 1980s after decline of the previous summer forms, Ceratium spp., has been maintained. Improvement in water quality is unlikely to be achieved at the present phosphorus loading.
    Schlagwort(e): Chemistry ; Limnology ; Pollution ; Eutrophication ; Freshwater lakes ; Limnological surveys ; Phosphorus ; Phytoplankton ; Primary production ; Sediment analysis ; Water quality ; England ; Esthwaite Water
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 119-131
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  • 26
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5288 | 1256 | 2011-09-29 15:08:15 | 5288 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Biomanipulation is a form of biological engineering in which organisms are selectively removed or encouraged to alleviate the symptoms of eutrophication. Most examples involve fish and grazer zooplankton though mussels have also been used. The technique involves continuous management in many deeper lakes and is not a substitute for nutrient control. In some lakes, alterations to the lake environment have given longer-term positive effects. And in some shallow lakes, biomanipulation may be essential, alongside nutrient control, in re- establishing former aquatic-plant-dominated ecosystems which have been lost through severe eutrophication. The emergence of biomanipulation techniques emphasises that lake systems are not simply chemical reactors which respond simply to engineered chemical changes, but very complex and still very imperfectly understood ecosystems which require a yet profounder understanding before they can be restored with certainty.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Freshwater lakes ; Biomanipulation ; Water quality control
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 73-81
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  • 27
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5299 | 1256 | 2011-09-29 15:07:19 | 5299 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This article discusses problems of modelling the seasonal succession of algal species in lakes and reservoirs, and the adaptive selection of certain groups of algae in response to changes in the inputs and relative concentrations of nutrients and other environmental variables. A new generation of quantitative models is being developed which attempts to translate some important biological properties of species (survival, variation, inheritance, reproductive rates and population growth) into predictions about the survival of the fittest, where ”fitness” is measured or estimated in thermodynamic terms. The concept of ”exergy” and its calculation is explored to examine maximal exergy as a measure of fitness in ecosystems, and its use for calculating changes in species composition by means of structural dynamic models. These models accomodate short-term changes in parameters that affect the adaptive responses (species selection) of algae.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Phytoplankton ; Freshwater lakes ; Models ; Growth ; Modelling ; Energy ; Inland water environment ; Thermodynamics
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 59-72
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  • 28
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5300 | 1256 | 2011-09-29 15:07:17 | 5300 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Like other rivers in the Paris area, the Oise is subject to important seasonal algal blooms. This eutrophication generates notable problems for the production of drinking-water from a treatment plant on the river at Méry. A mathematical model has been developed to simulate variation in water quality in a pre-treatment storage basin, and another model is currently being adapted to model the River Oise. Integration of the two models should provide a comprehensive tool for predicting variations of phytoplankton and water-quality parameters associated with algal blooms. This will be a decision-aid for optimizing control of the treatment process for providing potable water.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Eutrophication ; Algal blooms ; Water treatment ; Water supply ; Modelling ; Models ; Phytoplankton ; Water management ; France ; Oise River
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 143-149
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  • 29
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5306 | 1256 | 2011-09-29 15:06:38 | 5306 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Ecosystem level models are motivated by some combination of scientific and practical concerns. Those models motivated by practical concerns are likely to bear little historical relation to previous models. Mechanisms of interaction between particular species and their ecosystems vary enormously. Some species literally construct their own ecosystems. Others have more or less complex and important interactions with other species so that their presence or absence may alter the ecosystem. Prior information about the natural history of particular species can make ecosystem investigations quicker, cheaper, and more effective. The optimal resource for preparing to deal with the unlimited diversity of questions asked of ecologists would be a large' computerized databank of natural history observations for as many species as possible.
    Schlagwort(e): Ecology ; Limnology ; Oceanography ; Ecosystems ; Aquatic environment ; Species ; Interspecific relationships ; Biology ; Models
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 75-87
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  • 30
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5309 | 1256 | 2011-09-29 15:06:43 | 5309 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The effects of stress on the immune system of various fish species including dab Limanda limanda, flounder Platichthys flesus, sea bass Dicentrarchus labrax and gobies Zosterisessor ophiocephalus, were investigated from laboratory and field experiments, using various assays to measure immunocompetence, correlated with histological and ultrastructural observations. Modulation of the immune system was demonstrated at tissue, cellular and biochemical levels following exposure to various stressors. The spleen somatic index was depressed in dab stressed in the laboratory and gobies collected from polluted sites in the Venice Lagoon. Differential blood cell counts consistently showed an increase in phagocytes and decrease in thrombocytes in fish exposed to various stressors. Phagocytic activity from spleen and kidney adherent cells was stimulated in dab stressed by transportation but depressed in fish exposed to chemical pollutants. Respiratory burst activity in phagocytic cells was also stimulated in stressed dab but depressed in sea bass exposed to cadmium. The results are discussed in relation to current concepts on stress in fish and the regulation of the immune system.
    Schlagwort(e): Biology ; Fisheries ; Limnology ; Bioassays ; Nervous system ; Immunity ; Biological stress ; Marine fish ; Pollution effects ; Kidneys ; Phagocytosis ; Italy ; Porto Marghera
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 111-123
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  • 31
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5310 | 3949 | 2011-09-29 15:07:00 | 5310 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: A comparison of some different European methods of estimating the numbers of fish in a lake using different fishing gear is described. The different gears used were 1. surface trawl used by night 2. bottom trawl used by day 3. trammel nets, set in the evening and lifted in the morning 4. surface seine net used by night 5. bottom seine net used by day 6. Fyke nets, emptied each morning and evening 7. gill nets, set in the evening and lifted in the morning. The most variable catches were from those gears used by day on the bottom and the least variable were those used by night at the surface. The work continued by examining the use of acoustic systems for pelagic fish stock assessment. This gear gave reasonable population estimates for pelagic fish 10m and more below the surface. The advantage of the accoustic method is that it is quick and requires little labour. Its disadvantage is that it is not possible to identify the species and so it must be supplemented by another, conventional method.
    Schlagwort(e): Fisheries ; Management ; Acoustic equipment ; Entangling nets ; Experimental fishing ; Fishery surveys ; Fishery resources ; Fishing gear ; Gillnets ; Population number ; Seine nets ; Trap nets ; Trawl nets ; Europe ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
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  • 32
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5318 | 1256 | 2011-09-29 15:05:37 | 5318 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: It is widely recognised that conventional culture techniques may underestimate true viable bacterial numbers by several orders of magnitude. The basis of this discrepancy is that a culture in or on media of high nutrient concentration is highly selective (either through ”nutrient shock” or failure to provide vital co-factors) and decreases apparent diversity; thus it is unrepresentative of the natural community. In addition, the non-culturable but viable state (NCBV) is a strategy adopted by some bacteria as a response to environmental stress. The basis for the non-culturable state is that cells placed in conditions present in the environment cannot be recultured but can be shown to maintain their viability. Consequently, these cells would not be detected by standard water quality techniques that are based on culture. In the case of pathogens, it may explain outbreaks of disease in populations that have not come into contact with the pathogen. However, the NCBV state is difficult to attribute, due to the failure to distinguish between NCBV and non-viable cells. This article will describe experiences with the fish pathogen Aeromonas salmonicida subsp. salmonicida and the application of molecular techniques for its detection and physiological analysis.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Bacteria ; Bacterial diseases ; Detection ; Methodology ; Molecular biology ; Microbiological culture
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 28-34
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  • 33
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5312 | 3949 | 2020-08-23 05:42:57 | 5312 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This review considers three general aspects of research on zooplankton patchiness: the detection of patchiness, the description of patchiness and the causes of patchiness.
    Schlagwort(e): Ecology ; Limnology ; Freshwater lakes ; Horizontal distribution ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 32-44
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  • 34
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5333 | 1256 | 2011-09-29 15:04:52 | 5333 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Interest in the identification and characterisation of cyanobacteria and dinoflagellates in aquatic environments is increasing rapidly due to the perceived roles of these organisms in primary production and nuisance aspects in terms of water treatment and public health. Techniques for the identification and quantification of these organisms currently are limited, and the application of molecular approaches provides fundamental taxonomic information and techniques of practical value. Antigenic properties of algal cells may be useful taxonomic markers. Immunodetection techniques utilise the specificity of the antibody/antigen association as a probe for recognising and distinguishing between microorganisms according to their cell- surface chemistry. Immunofluorescent detection of unicellular cyanobacteria and dinoflagellates has been studied with success in marine and freshwater ecosystems and a range of techniques and results are presented and discussed. The most recent advances in the study of planktonic algae have come with the application of continuous flow cytometric methods (CFC). Flow cytometry makes use of the autofluorescence properties of the algal cells, which alone can be used to demonstrate their presence and permit their quantification in natural water samples. When used in conjunction with immunolabelling techniques, the potential of CFC analysis is broadened to study the serological/strain composition of plankters in natural populations. Changes in algal strains represented within and between waters over periods of time are reported and discussed, along with the ecological issues thus raised.
    Schlagwort(e): Ecology ; Limnology ; Bacteria ; Methodology ; Algae ; Plankton ; Immunology ; Detection ; Toxicity tests ; Immunofluorescence ; Synechococcus ; Alexandrium tamarens ; Prorocentrum micans
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 92-103
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  • 35
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5338 | 1256 | 2011-09-29 15:04:07 | 5338 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Protozoa feed on and regulate the abundance of most types of aquatic microorganisms, and they are an integral part of all aquatic microbial food webs. Being so small, aerobic protozoa thrive at low oxygen tensions, where they feed (largely unaffected by metazoan grazing) on the abundance of other microorganisms. In anaerobic environments, they are the only phagotrophic organisms, and they live in unique symbiotic consortia with methanogens, sulphate reducers and non-sulphur purple bacteria. The number of extant species of protozoa may be quite modest (the global number of ciliate species is estimated at 3000), and most of them probably have cosmopolitan distributions. This will undoubtedly make it easier to carry out further tasks, e.g. understanding the role of protozoan species diversity in the natural environment.
    Schlagwort(e): Ecology ; Limnology ; Oxygen depletion ; Distribution ; Species diversity ; Inland water environment ; Freshwater ecology ; Food webs ; Filter feeders ; Metabolism ; Protists
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 113-125
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  • 36
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5344 | 1256 | 2011-09-29 15:02:55 | 5344 | Freshwater Biological Association
    Publikationsdatum: 2021-07-10
    Beschreibung: Remarkably little has been published on the feeding habits of the non-salmonid fishes of British fresh waters. The following report briefly summarizes the results obtained from the examination of the stomach contents of some 2,700 fish, belonging to 19 species, which were obtained during 1939. The results of all examinations of gut contents were analysed, species by species, upon a simple basis of the presence of different types of food. Foodstuffs were divided up into six main categories— fish, molluscs, insects, crustaceans, higher plants together with filamentous algae, and diatoms—and the occurrence of members of any of these categories was recorded for each fish.
    Schlagwort(e): Biology ; Fisheries ; Limnology ; Coarse fish ; Feeding ; Feeding behaviour ; Fishery surveys ; Food organisms ; Gutting ; England
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 315-322
    Format: 33
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  • 37
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5410 | 9 | 2011-09-29 14:59:49 | 5410 | Freshwater Biological Association
    Publikationsdatum: 2021-07-10
    Beschreibung: A supplement to the earlier bibliography compiled by Elliott and Tullett 1978 (FBA Occas. Publ. No. 4) covering literature from December 1977 - December 1982 on samplers that could be used for the rapid removal of benthic intertebrates from the natural substrata of rivers and streams. In addition it includes papers on marine samplers that have been or could be used in freshwater.
    Beschreibung: Original bibliography held as http://aquaticcommons.org/5275/
    Schlagwort(e): Ecology ; Limnology ; Benthos collecting devices ; Biological sampling ; Limnological equipment ; Samplers ; Invertebrate larvae ; Benthos ; Bibliographies
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 61
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  • 38
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    Freshwater Biological Association | Ambleside, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/9627 | 1256 | 2013-10-27 12:24:04 | 9627 | Freshwater Biological Association
    Publikationsdatum: 2021-07-07
    Beschreibung: Booklet telling the story of the FBA from its founding in 1929 until its Golden Jubilee in 1979. The booklet aimed to produce a readable account of those aspects of freshwater biology that have been among the main themes of the Association's research, as well as some aspects of its history and the philosophy guiding its foundation. The publication includes many images of the FBA's work and history as well as images and illustrations on lake ecology and applied science.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater scientists ; Freshwater sciences ; Limnology ; Organisations
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 39
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  • 39
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5161 | 3949 | 2011-09-29 15:17:51 | 5161 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: Actinomycetes are a group of micro-organisms which lie, in classification, half-way between the fungi and the bacteria. They may be isolated from the plating of leaf washings, water samples and mud dilutions on to nutrient agar (with incorporated actidione to eliminate fungi). The predominant genus varied with the source of the sample. An attempt was also made to isolate the phages of some Actinomycetes. A search was made in the typical environments of the host, for the virus. In this way actinophage were also isolated; and shown to be capable of being transmitted from one host strain to another host strain within 1 sp or from one host to another within 1 genus; i.e. polyvalent.
    Schlagwort(e): Biology ; Ecology ; Environment ; Bacteria ; Fungi ; Microbiological culture ; Viruses ; Actinomycetes ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
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  • 40
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5160 | 3949 | 2011-09-29 15:19:35 | 5160 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: Epilithic algae, ie that growing on the surface of stones, was studied as part of the work on the energy flow of the chalk-stream ecosystem, by the River Laboratory. The study area was on Bere Stream and 2 neighbouring streams. The algal biomass was estimated from analysis of chlorophyll a. In Bere Stream the peak chlorophyll a cover occurred in April, while in the neighbouring streams, which have considerably lower nutrient levels, there was on peak. Assuming that 2% of a diatoms dry wt is chlorophyll a, then even in mid-April the biomass of epilithic algae amounted to no more than 15 g dry wt m Super(-2) of exposed gravel. Annual production was calculated to be 〉 15 times greater than biomass. The estimation of net primary production is always difficult for benthic floras and comparisons are especially difficult when different methods are used. But these figures contrast sharply with those for Ranunculus (water crowfoot) which has a ratio of annual production to maximal seasonal biomass of 1:16. The accumulation of algal biomass is apparently being prevented. Some organic matter may be excreted; some algae will be washed off the bed of the stream by current and grazing by herbivorous invertebrates will also tend to prevent algal accumulation.
    Schlagwort(e): Biology ; Ecology ; Environment ; Phytoplankton ; Algae ; England ; Dorset ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
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  • 41
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5158 | 3949 | 2011-09-29 15:19:31 | 5158 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: The pike (Esox lucius) year classes are more stable than those of the perch (Perca fluviatilis), and have been shown to be closely correlated with temp conditions during the first few months of life. The perch year class strengths have been more variable; for success they require the presence of several positive conditions and the absence of many adverse conditions which could cause failure, a favourable combination of circumstances rarely occurs. The conclusions refer only to Windermere from 1941-1964.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Age composition ; Esox lucius ; Perca fluviatilis ; England ; Lake District ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
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  • 42
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5159 | 3949 | 2011-09-29 15:19:33 | 5159 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: This review summarizes the findings of 5 years' research (June 1970-June 1975) on the meres of the Shropshire-Cheshire Plain. A mere is a small, shallow lake; supplied principally by ground water, whose chemical composition is infkuenced by the glacial frift through which it is percolating. The seasonal periodicity of the phytoplankton in the meres involved work mainly in the Grose Mere. Here diatoms were typically dominant in Feb & March, green algae in April & May, blue-green algae in early summer and dinoflagellates in late summer. This pattern is broadly similar from year to year, and has been suggested to be representative of a 'regional type'; it is also similar to that described for many of the world's mildly eutrophic temperate lakes. Vertical distribution of phytoplankton is influenced by their buoyancy (or lack of it) of by their ability to swim. A stylized depth-time distribution of 4 major phytoplankton components in Crose Mere is given diagrammatically.
    Schlagwort(e): Ecology ; Environment ; Limnology ; Freshwater ecology ; phytoplankton ; England ; Cheshire ; Shropshire ; Annual Report
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5165 | 3949 | 2011-09-29 15:18:21 | 5165 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: The Gussage, a Dorset winterhourne (intermittent chalk stream), has been used to convey water from a compensation borehole to the River Allen to supplement its flow to meet demand for water. Sections of the Gussage have been lined with chalk, butyl sheeting or polythene sheeting to prevent water loss through the porous bed. The effects of this major environmental modification associated with these abstraction practices in the winterbourne catchments have been studied in the Gussage system since 1973. To compensate for the lack of adequate pre-lining data, comparative studies have been made on 3 small unlined chalk streams of varying flow regimes, ie. the Crichel (a winterbourne), the North Winterbourne and the Tarrant (permanent discharge in the reaches studies). The distribution of macrophytes and invertebrates in winterbournes are compared with that in natural and artificial permanent streams. Statistical analysis showed samples from the winterbourne sites and the unmodified permanent stream sites are quite distinct, despite the fact that no samples were taken from winterbourne sites during the dry phase. This emphasizes the differences between the fauna of an intermittent and a permanent stream and suggests that alteration of the flow regime could be a significant factor. Where flow regime has been altered, as in the Gussage downstream of the borehole, the samples occupy an intermediate position. Within this group of modified sites there is no apparent gross difference between the invertebrates of lined or unlined reaches.
    Schlagwort(e): Biology ; Ecology ; Environment ; Ecological distribution ; Ecology ; Watersheds ; England ; Dorset ; Annual report
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  • 44
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5172 | 3949 | 2011-09-29 15:18:50 | 5172 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: The life cycle of the river lamprey, L. fluviatilis, is reviewed. The larval lamprey, or ammocoete, is a blind, filter-feeding animal, which normally lies concealed in the silt deposits of streams and rivers. After a period of 3-5 years in fresh water the ammocoete undergoes a metamorphosis in the summer months into a sexually immature, non-feeding stage known as the macrophthalia, which is active. This stage migrates downstream in late winter. It adopts a parasitic existence, in intertidal areas. After 18 months it returns to spawn in fresh water, after a final freshwater stage lasting up to 9 months. The river lamprey dies within a few days after the spawning period of 3-4 weeks, and none survive to spawn the following year.
    Schlagwort(e): Biology ; Ecology ; Fisheries ; Life cycle ; Physiology ; Lampetra fluviatilis ; Annual report
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: 40-46
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  • 45
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5175 | 3949 | 2011-09-29 15:19:19 | 5175 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Limnetic crustaceans (i.e. those which live in the open water of lakes and ponds) were investigated in Esthwaite water and adjacent lakes. These are represented by two groups, Copepoda and Cladocera.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater crustaceans ; Zooplankton ; Lakes ; Cladocera ; England ; Esthwaite Water ; Annual report
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    Format: application/pdf
    Format: 70-73
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  • 46
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5126 | 1256 | 2011-09-29 15:23:16 | 5126 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: This short interim progress report builds on previous progress reports which have described the quantification of the process both within and between lakes of different degrees of eutrophication. These data indicated that slight changes in methodology, particularly when investigating sediment deposits, could grossly affect the measured activity. The aim of the present research was an attempt to rationalize these differences. If this could be achieved it would enable meaningful interpretation of published data obtained using different methods and therefore enlarge the available database. In addition some observations have been made on the production of nitrite by Grasmere profundal sediment slurries sampled during the circulation period.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater lakes ; Nitrification ; Sedimentation ; Ammonia ; Slurries ; England ; Grasmere Lake
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 47
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5157 | 3949 | 2011-09-29 15:19:58 | 5157 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: The area studied was the River Frome system below Dorchester. The main river has its origins mainly in chalk springs, although some of its tributaries have surface run-off from farm lands and heath-lands. Thus the chemistry of the river is affected by changes in land practice and differences in the geology of the catchment area. Regular chemical analysis of chalk waters started at the River Laboratory in 1964, Regular weekly analyses have been carried out since 1965 at Bere Stream (a small chalk stream) and the River Frome (a large chalk stream); also single samples have been analysed to provide preliminary information. In 1970-71 an attempt was made to discover the contribution each main source made to the flow and chemical composition of the River Frome. Results of these investigations are presented in the paper.
    Schlagwort(e): Chemistry ; Environment ; Chemical analysis ; Chemical composition ; Rivers ; Stream flow ; Annual report ; England ; Dorset
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  • 48
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5164 | 3949 | 2011-09-29 15:18:18 | 5164 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: For conservations of nature to be effective. there must be an understanding of what is present to be conserved. Thus in order to conserve the communites of the Cumbrian rivers, there must first be surveys to determine the spp present and their relative numbers. This has been carried out for many years, by a number of workers. It has been shown that the communities present are influenced by the substratum, the flow, the chemicals present, water temp and predation. Findings of the work on the River Lune were given at a seminar on the rivers of north-west Europe, held at Amiens in November, 1975. The proceedings of the seminar are to appear in special numbers of Bulletin francais de Pisciculure.
    Schlagwort(e): Ecology ; Environment ; Aquatic communities ; Rivers ; England ; Cumbria ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
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    Format: application/pdf
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  • 49
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5170 | 3949 | 2011-09-29 15:18:46 | 5170 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: A short review of the work carried out by the FBA on feeding and growth of brown trout is presented in this article. Since the amount of work done on this subject is quite extensive, this review has to be very selective. The work has been previously described in 10 papers, 9 of which were written by the author (J.M.Elliott) and 1 written by the author and W.Davison- references for these, and the pioneer work of M.E.Brown and F.T.K.Pentelow, are supplied at the end of the article.
    Schlagwort(e): Biology ; Ecology ; Feeding ; Taxonomy ; Metabolism ; Salmo trutta ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
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    Format: application/pdf
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  • 50
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5171 | 3949 | 2011-09-29 15:18:48 | 5171 | Freshwater Biological Association
    Publikationsdatum: 2021-07-08
    Beschreibung: An explanation of the basic premises of the subject and its terminology is given. The article then outlines aspects of research on the organic material found in lacustrine sediments, and the analytical methods involved.
    Schlagwort(e): Chemistry ; Earth Sciences ; Diagenesis ; Freshwater lakes ; Geochemistry ; Lipids ; Sediment analysis ; Annual report
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: application/pdf
    Format: 45-56
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  • 51
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5178 | 3949 | 2011-09-29 15:16:57 | 5178 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Some of the results from an investigation of five species of coarse fish, in the Stour River, carried out from 1968-1978 are presented in this article. The species involved were: Rutilus rutilis, Leuciscus leuciscus, L. cephalus, Esox lucius and Perca fluviatilis : which are of particular interest to anglers. Although these species show some similarities, as in the shape of the annual and seasonal growth curves, in most other respects each species occupies a distinct niche in the ecosystem and has a life-history strategy peculiar to itself. In this study only 5 species were investigated. When all the species present are considered the relationships or diversities suggested here will therefore be made far more complex.
    Schlagwort(e): Biology ; Ecology ; Life history ; Coarse fish ; Rutilus rutilus ; Leuciscus leuciscus ; Leuciscus cephalus ; Esox lucius ; Perca fluviatilis ; England ; River Stour ; Annual report
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: application/pdf
    Format: 51-59
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  • 52
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5182 | 3949 | 2011-09-29 15:17:19 | 5182 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Information on fecundity, oviposition behaviour, egg hatching, and parthenogenetic development of Ephemeroptera is reviewed and summarized.
    Schlagwort(e): Biology ; Ecology ; Reproduction (biology) ; Ephemeroptera ; Annual report
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: application/pdf
    Format: 41-52
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  • 53
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5190 | 3949 | 2011-09-29 15:14:57 | 5190 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Research into the production ecology of chalk streams using a large artificial recirculating stream is described. Physical chemical processes including calcium and inorganic phosphate levels, and exchange of gaseous carbon dioxide in both a simple closed system and a circulating system with gravel substrate have been monitored in both light and dark conditions. Further experiments were concerned with the seasonal changes in algal growth over the gravel substrate with constant water velocities and replenishment. The algal population, composed mainly of the diatoms Achnanthes minutissima, Meridion circulare, Nitzschia fonticola and Synedra ulna reached a peak in mid May and declined rapidly during June. Concentrations of phosphate phosphorus fell as the diatoms grew but was not thought to limit growth. Silicate concentrations followed the diatom cycle closely but never fell below 0.8 mg/l Si. It is possible that one of the nutrients may have been limiting the rate of growth due to steep diffusion gradients through the algal mat. In the last summer and autumn a hard calcareous crust composed of the green alga Gongrosira incrustans and the blue green alga Homeothrix varians , developed. The channel stream is compared with the natural conditions found in chalk streams.
    Schlagwort(e): Biology ; Ecology ; Algae ; Fresh water ; Growth ; Phosphates ; Population dynamics ; Seasonal variations ; Silicates ; Achnanthes minutissima ; Meridion circulare ; Synedra ulna ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 63-75
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  • 54
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5206 | 1256 | 2011-09-29 15:16:23 | 5206 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The current situation of regional, rather' than national, problems of eutrophication in standing waters has been widely aired in recent reports. A reliable, quantitative data base is a prerequisite to future trend monitoring, a concensus view of those reports. The objective of this report is to establish requirements, methodology and a minimal data set for nutrient and algae status in water supply reservoirs in England which may be used as a protocol for future trend monitoring.A pilot study has been carried out to assess the relative merits of different sampling strategies, the choice of which has major implications for the cost of sample collection. This short report suggests that consider the possibility of designating a few sites as ”baseline sites” at which detailed changes in trophic status as monitored by the more labour-intensive parameters would be collected on a regular, long term basis to help in the interpretation of the low cost survey results.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater lakes ; Eutrophication ; Monitoring ; Surveying ; England ; Grasmere Lake
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 55
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5208 | 1256 | 2011-09-29 15:16:34 | 5208 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This project investigated the production of nitrate (nitrification) by bacteria in lakes. The work was undertaken as nitrification is a key process in the nitrogen cycle and previous estimates of rates of nitrification were unreliable. When different methods were used to estimate rates of nitrification within sediment deposits different results were obtained. Investigation' of specific aspects of these methodologies has allowed some rationalization of these observations and also enabled comparisons of previously published data which, beforehand, was not possible. However, it was not clear which methods gave the most reliable rate estimates. Calculation of a nitrate budget for Grasmere lake indicated that the use of methods which involved the mixing of surface sediments (and therefore disrupted preformed nutrient gradients) overestimated the rate of nitrification. The study concludes that slight changes in the method used to prepare sediment slurries can result in large changes, in the measured nitrifying activity. This makes comparisons between studies, using different methods, extremely difficult. Methods to study sediment nitrification processes which do not disrupt preformed substrate gradients within the sediment provide the most reliable rate estimates.
    Schlagwort(e): Ecology ; Limnology ; Bacteria ; Nitrification ; Freshwater lakes ; Sediment samples ; Slurries ; Seasonal variations ; Methodology ; England ; Grasmere Lake
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 47
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  • 56
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5210 | 1256 | 2011-09-29 15:16:44 | 5210 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The objective of this short project progress report is to investigate the possible water quality implications of modern watercress growing practices. Chalk receiving watercourses are usually of high supply, amenity, game fishing and fish farming value. Any headwater pollution load, therefore, needs characterising and quantifying. Two sites of watercress farming were studied in 1986-87 and nutrient levels examined. Different approaches of watercress farmers in Dorset and Hampshire are summarised.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Rivers ; Aquaculture ; Aquaculture enterprises ; Aquaculture techniques ; Nutrients (mineral) ; England
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 3
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  • 57
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5212 | 1256 | 2011-09-29 15:14:35 | 5212 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Changes in management practices and agricultural productivity over the past twenty years have lead to nitrate pollution and eutrophication of lakes and rivers. Information on nitrate concentrations and discharge has been collected on the River Frome at East Stoke since 1965, using the same analytical nitrate method so that the results are comparable. These records of weekly spot values of nitrate concentration and daily mean discharges have been analysed for trends and seasonal patterns in both concentration and nitrate loadings. In this extension of our nitrate contract, a new automated method of intensive sampling has been used to monitor short-term variability and to assess how well similar routine (weekly) sampling schemes can represent the true nitrate record.
    Schlagwort(e): Ecology ; Limnology ; River discharge ; Rivers ; Automated recording ; Nitrates ; Modelling ; England ; Frome River
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 53
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  • 58
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5213 | 1256 | 2011-09-29 15:14:36 | 5213 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Sampling was concentrated on the North Moor region and the series of ditches which drained this area to the Bristol Channel. Although most ditches were not deep the mud substratum precluded sampling from within the habitat. All samples were taken with a pond net from the banks. Efforts were made to sample each part of the habitat although in some ditches the macrophyte growth was so intense as to make sampling difficult particularly of the sediments. Organisms were identified on the 10 sampling sites.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Trenching ; Biological sampling ; Identification ; Biological surveys ; England ; Somerset
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 53
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  • 59
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5209 | 1256 | 2011-09-29 15:16:40 | 5209 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The objective of this short project progress report is to investigate, in a catchment on which earlier nitrate data are available for comparison, seasonality and budgets, in relation to land use, of nitrate inputs, concentrations and loads. Sampling was undertaken from 1984-87 in the River Frome catchment and data on nitrate concentrations analysed.
    Schlagwort(e): Ecology ; Limnology ; Rivers ; Catchment area ; Nitrates ; Nitrification ; Nitrites ; Environmental monitoring ; England ; Frome Lake
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 60
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5207 | 1256 | 2011-09-29 15:16:29 | 5207 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: A good understanding of the population dynamics of algal communities is vital in many ecological and pollution studies of freshwater and oceanic systems. Present methods require manual counting and identification of algae and can take up to 90 min to obtain a statistically reliable count on a complex population. Several alternative techniques to accelerate the process have been tried on marine samples but none have been completely successful because insufficient effort has been put into verifying the technique before field trials. The objective of the present study has been to assess the potential of in vivo fluorescence of algal pigments as a means of automatically identifying algae. For this work total fluorescence spectroscopy was chosen as the observation technique.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Algae ; Identification ; Methodology ; Fluorescence ; Fluorescence spectroscopy ; England
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 61
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5215 | 1256 | 2011-09-29 15:14:31 | 5215 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The paper reviews the methodology of attempts to assess the importance of washout as a cause of loss of salmonid eggs and alevins. The results of this study are presented of various small-scale field trials using buried artificial salmonid eggs and tethered table tennis balls. The results suggested that, even when few eggs were actually lost by washout, some downstream movement of the upper layers of gravel and of artificial eggs might have taken place.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Fish eggs ; Spawning ; Gravel ; Freshwater fish ; Biological drift ; Redds ; Induced breeding ; England ; Great Eggleshope Beck
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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  • 62
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5214 | 1256 | 2011-09-29 15:14:29 | 5214 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Sampling was concentrated on the North Moor region and the series of ditches which drained this area to the Bristol Channel. Although most ditches were not deep the mud substratum precluded sampling from within the habitat. All samples were taken with a pond net from the banks. Efforts were made to sample each part of the habitat although in some ditches the macrophyte growth was so intense as to make sampling difficult particularly of the sediments. Organisms were identified on the 10 sampling sites.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Redds ; Spawning grounds ; Rivers ; Fish eggs ; Spawning ; Gravel ; Freshwater fish ; England
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 36
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  • 63
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5211 | 1256 | 2011-09-29 15:14:56 | 5211 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: There is little doubt that both mammalian and teleost growth hormones can accelerate growth and increase food conversion efficiency in all commonly-reared species of salmonid fish. In those vertebrates that have been closely studied (predominantly mammals), the pituitary hormone somatotropin (GH or growth hormone) is a prime determinant of somatic growth. The hormone stimulates protein biosynthesis and tissue growth, enhances lipid utilization and lipid release from the adipose tissues (a protein-sparing effect) and suppresses the peripheral utilization of glucose. The present study is a prerequisite for future work on growth hormone physiology in salmonids and should contribute to our understanding of the mechanisms of growth suppression in stressed fish. Plasma growth hormone (GH) levels were measured in rainbow trout using a radioimmunoassay developed against chinook salmon growth hormone.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Salmon fisheries ; Freshwater fish ; Hormones ; Blood ; Growth ; England ; Oncorhynchus mykiss
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 47
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  • 64
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5217 | 1256 | 2011-09-29 15:14:13 | 5217 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The main British salmonid species spawn in clean gravel in streams and rivers, many of them in the upland areas of Britain. The earliest stages of the life cycle (eggs and alevins) spend some months within the gravel of the river bed. During this period their survival rate can be strongly influenced by flow regime and by related phenomena such as movement of coarse river bed material, changes in water level and the deposition of silt. In recent years human influence upon the flow regimes of upland water courses and upon the sediment inputs to them has increased. In order to conserve and, if possible, enhance the populations of salmonid fishes a deeper understanding of the interrelationships between survival of young salmonids and flow-related phenomena is needed. The acquisition of appropriate information is the main aim of the present project, which included: Studies on silt movement and the infilling of gravel voids by fine sediments, together with initial studies on the relationship between intragravel oxygen supply rate and the survival of intragravel stages of salmonids; studies in the general field of egg washout. The latter investigated the physical background to gravel bed disruption, the examination of the physical characteristics of sites chosen for redds, dimensions of redds and burial depth of eggs relative to the size of the fish constructing the redd and a series of smaller studies on other aspects of egg washout.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Fish eggs ; Freshwater fish ; Experimental data ; Silting ; Gravel ; Survival ; England ; Grassholme Reservoir
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    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 32
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  • 65
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5216 | 1256 | 2011-09-29 15:14:33 | 5216 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: It is generally accepted by fish culturists that salmonid eggs are sensitive to mechanical shock and that the sensitivity varies with the stage of development of the eggs. In general, the period of greatest sensitivity is thought to occur between fertilization and ”eyeing”. However, it is reasonable to expect that, during a period (perhaps of several hours) following fertilization, sensitivity will be low because in nature during this period the eggs may be subject to some mechanical shock caused by the parent fish covering them with gravel. In 1983-4 and 1984-5 experiments were performed on brown trout (Salmo trutta L.) eggs to examine the effect of a standard mechanical shock (c. 2,500 eggs in 1983-4 and c. 8,400 eggs in 1984-5) at various stages of development upon survival to hatching and time of hatching.The results of these experiments are reported in this study.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Fish eggs ; Spawning ; Freshwater fish ; Experimental data ; Survival ; Mechanical stimuli ; England ; Cow Green Reservoir
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 23
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  • 66
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5220 | 1256 | 2011-09-29 15:12:05 | 5220 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Laboratory and field studies have shown that the survival of salmonid fish eggs and alevins is dependent upon the supply rate or flux of dissolved oxygen through gravel beds used for spawning. Although there have been a number of studies concerned with North American species there are few data for Atlantic salmon (Salmo salar) and the brown trout (S. trutta). For this study intragravel seepage velocities and dissolved oxygen concentrations have been measured throughout the incubation period in spawning gravels utilized by brown trout (Salmo trutta). Variation in the hatching success of batches of trout and salmon (Salmo salar) can, in part, be attributed to a critical threshold of oxygen flux through the gravels.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Freshwater fish ; Gravel ; River beds ; Rivers ; Dissolved oxygen ; Survival ; Fish eggs ; England ; Black Brows Beck
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 34
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  • 67
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5219 | 1256 | 2011-09-29 15:12:03 | 5219 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: High suspended sediment loads may be deleterious to adult salmonids and invertebrates in gravel-bedded streams. Further, the accumulation of fine material in the interstices of the gravel may have an adverse impact on the recruitment of the young stages of salmonids. It is important therefore not only to quantify the rates and degrees of silting but also to identify sediment sources and to determine both, the frequency of sediment inputs to the system and the duration of high sediment concentrations. This report explores the application of variance spectrum analysis to the isolation of sediment periodicities. For the particular river chosen for examination the method demonstrated the essentially undisturbed nature of the catchment. The regulated river chosen for examination is the River Tees in Northern England. Variance spectrum analysis was applied to a series of over 4000 paired daily turbidity and discharge readings.
    Schlagwort(e): Ecology ; Limnology ; Freshwater fish ; Resuspended sediments ; River beds ; River discharge ; Rivers ; Variance analysis ; Turbidity ; England ; Tees River
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 20
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  • 68
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5218 | 1256 | 2011-09-29 15:12:02 | 5218 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: A number of authors have described the manner in which young salmonids, soon after emergence from the gravel, set up and defend territories. This leads to mortality or downstream displacement of the individuals which are unable to acquire territories and is widely accepted as the main method of population regulation amongst young salmonids. In some field experiments the fish were constrained in screened reaches and the option of downstream dispersal for the surplus fry was thus excluded. In order to explore some aspects of downstream dispersal more closely under conditions which gave more control than is obtained in a natural stream, four experimental channels were set up at Grassholme reservoir in Teesdale. The report describes the results of investigations on the timing and rate of downstream movement of young brown trout (Salmo trutta L.) and Atlantic salmon (Salmo salar L.) out of experimental channels, with special reference to the effect of water velocity on the rate of ”emigration”.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Freshwater fish ; Experimental data ; Survival ; Juveniles ; Territoriality ; Catadromous migrations ; Current velocity ; England ; Grassholme Reservoir
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 37
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  • 69
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5222 | 1256 | 2011-09-29 15:12:09 | 5222 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Because of the widespread concern over increasing nitrate concentrations in river water , the Freshwater Biological Association has undertaken a study to investigate seasonality, nitrate concentrations and loads in the River Frome catchment in relation to land use and compare the results for 1984/86 with data obtained in 1970/71. Information on land use changes and fertiliser applications were obtained both from MAFF and individual farmers. The study concludes that input of nitrogen from rainfall to the River Frome catchment had not significantly changed between 1970/71 and 1984/86.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Rivers ; Nitrogen ; Rain ; River discharge ; Monitoring ; Sewage ; Nitrates ; Fertilizers ; England ; Frome River
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 67
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  • 70
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5223 | 1256 | 2011-09-29 15:12:10 | 5223 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: There are two main ways in which gravel composition and changes therein arising from siltation, can influence the survival of young salmonids. First, the composition of the gravel will affect its permeability and, hence, may influence the survival of eggs and alevins through its effect upon the rate of supply of oxygen and the rate of removal of metabolic products. Second, the composition of the gravel may affect the ease, or otherwise, of emergence at the time of swim-up and alevins may become trapped in the gravel and perish. This aspect is the main concern of the present report. Experiments were conducted to examine the effects upon fry emergence of a sand layer deposited on the gravel surface. The study concludes that fry of brown trout and Atlantic salmon emerged through layers of sand up to 8 cm thick but the percentage emergence, even from the controls with no sand, was relatively low (5 - 68%). There was no firm evidence that the experimental treatments influenced percentage emergence, timing of emergence or weight of fry at the time of emergence.
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; Rivers ; Fry ; Experimental data ; Water currents ; Fish ; Developmental stages ; Dissolved oxygen ; England ; Kielder Water Reservoir ; Salmo trutta ; Salmo salar
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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  • 71
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5225 | 1256 | 2011-09-29 15:12:36 | 5225 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The overall goal of the joint research project is to relate the chemical reactions involved in the formation of organo-aluminium complexes under acid conditions to their toxic effects on the physiology of aquatic organisms. Finally, this research is intended to predict toxic effects arising from acidity and aluminium under varying environmental conditions. This interim report examines the chemical modelling of ion-binding by humic substances where a computer model has been developed and is being tested using field data, and conditions required for the precipitation of aluminium in surface waters.
    Schlagwort(e): Chemistry ; Limnology ; Pollution ; Modelling ; Models ; Humic acids ; Surface water ; Aluminium compounds ; Aluminium ; Ions ; Toxicity ; England ; Duddon River
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 26
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  • 72
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5224 | 1256 | 2011-09-29 15:12:34 | 5224 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: 20 samples of soil or sediment (7 of which were predominantly sand) from various locations were received for analysis of their content of organic pollutants. These analyses were performed using a capillary column gas chromatograph equipped with an electron impact (E.I.) mass spectrometer as detector and using computerised data storage. In addition to the target compounds, the full scan data were examined to determine the composition of natural organic products and a series of diagnostic fragment ions was used to search for additional anthropogenic products. Organic-rich environmental samples are notoriously difficult to analyse for pollutant organics owing to the presence of high concentrations of many natural organic compounds. A single procedure for extraction and clean-up was adopted. It was designed for chlorinated aliphatic and aromatic hydrocarbons and other pesticides containing acidic functional groups and was based on published methods for the determination of organic pollutants in soils and sediments. 4 soils and 2 sands showed levels of one or two groups of PCBs slightly in excess of the detection limit, one sample showed a similar level of 2,4-D and 3 samples contained dieldrin at or just above the detection limit.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Organic matter ; Methodology ; Dioxins ; Sediment sampling ; Hydrocarbon analysis ; Hydrocarbons ; England
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 13
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  • 73
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5239 | 3949 | 2011-09-29 15:13:47 | 5239 | Freshwater Biological Association
    Publikationsdatum: 2021-06-24
    Beschreibung: This review discusses the processes involved in the decomposition of organic carbon derived initially from structural components of algae and other primary producers. It describes how groups of bacteria interact in time and space in a eutrophic lake. The relative importance of anaerobic and aerobic processes are discussed. The bulk of decomposition occurs within the sediment. The role of bacteria in the nitrogen cycle and the iron cycle, and in sulphate reduction and methanogenesis as the terminal metabolism of organic carbon are described.
    Schlagwort(e): Biology ; Chemistry ; Anaerobic bacteria ; Bacteria ; Biodegradation ; Carbon cycle ; Eutrophic lakes ; Fresh water ; Geochemical cycle ; Iron ; Manganese ; Nitrates ; Nitrogen cycle ; Organic carbon ; Oxygen consumption ; Partical size ; Sedimentation ; Sulphates ; Sulphur ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 31-44
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  • 74
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5240 | 3949 | 2011-09-29 15:13:51 | 5240 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The majority of water mites found in freshwater belong to the Hydrachnellae, a group which exhibit striking morphological diversity. This paper reviews work on the structure, morphology and taxonomy. The role of water mites as predators, their life history and their parasitic associations with aquatic insect or freshwater mollusc hosts is discussed along with the distribution of water mites in the British Isles.
    Schlagwort(e): Biology ; Ecology ; Animal morphology ; Distribution records ; Fresh water ; Hosts ; Larvae ; Life cycle ; Parasites ; Predators ; Taxonomy ; Acari ; Arachnida ; Hydrachnellae ; British Isles ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 45-59
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  • 75
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5242 | 3949 | 2011-09-29 15:13:57 | 5242 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This article describes the progress of the River Communities Project which commenced in 1977. This project aimed to develop a sensitive and practical system for river site classification using macroinvertebrates as an objective means of appraising the status of British rivers. The relationship between physical and chemical features of sites and their biological communities were examined. Sampling was undertaken on 41 British rivers. Ordination techniques were used to analyze data and the sites were classified into 16 groups using multiple discrimination analysis. The potential for using the environmental data to predict to which group a site belonged and the fauna likely to be present was investigated.
    Schlagwort(e): Biology ; Ecology ; Aquatic communities ; Check lists ; Classification Systems ; Environmental factors ; Fresh water ; Rivers ; Sampling ; Invertebrata ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 80-93
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  • 76
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5245 | 1256 | 2011-09-29 15:14:09 | 5245 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The River Great Ouse is a highly managed large lowland river in eastern England. It drains rich arable land in the Midlands and Eastern England and over the years nutrient concentrations have increased and there is a general perception that the clarity of the water has decreased. The main river channels have been dredged a number of times partly for flood control reasons but also for recreational boating and navigation activities. The period covered by this first report has been used to develop specific methodology and instrumentation for measuring turbidity, suspended solids and underwater irradiance for conditions found in the middle abd lower reaches of the River Great Ouse. Sampling strategies have been developed and an extensive sampling programme is now underway covering phytoplankton, suspended solids and turbidity in relation to algal epiphyte growth on underwater macrophytes. Preliminary data are presented relating light levels on the river bed to the river bed profile, turbidity levels and phytoplankton chlorophyll a concentrations. Studies are underway concerning the extent of macrophyte cover and periphyton densities.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Rivers ; Seasonal variations ; Turbidity ; Aquatic pl ; England ; Great Ouse River ; Periphyton ; Phytoplankton ; Chlorophylls
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 12
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  • 77
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5246 | 3949 | 2011-09-29 15:08:18 | 5246 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Since its inception in the 1930's the Freshwater Biological Association at Windermere, England has been involved in research on African lakes and rivers. Research has included general and multidisciplinary surveys of many lakes including Lake Victoria, Lake Tanganyika, Lake Nyasa (Lake Malawi) and Lake George. The hydrobiology of the River Nile has also been studied. Research into physical and chemical limnology, phytoplankton ecology and primary productivity, invertebrate biology, freshwater fish and fisheries.
    Schlagwort(e): Biology ; Fisheries ; Limnology ; Algae ; Chemical limnology ; Fisheries ; Freshwater fish ; Freshwater lakes ; Hydrobiology ; Invertebrate zoology ; Parasitology ; Physical limnology ; Phytoplankton ; Primary production ; Research programs ; Rivers ; Tropical lakes ; Cichlidae ; Crustacea ; Invertebrata ; Mollusca ; Pisces ; Africa ; River Nile ; Lake Victoria ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 57-82
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  • 78
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5244 | 3949 | 2011-09-29 15:14:07 | 5244 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Loxodes faces special problems in living close to the oxic-anoxic boundary. In tightly-stratified ponds like Priest Pot its optimum environment may be quite narrow and it can be displaced by the slightest turbulence. Loxodes cannot sense an O sub(2) gradient directly but its ability to perceive gravity allows it to make relatively long vertical migrations. It is also sensitive to light and oxygen and it uses these environmental cues to modulate the parameters of its random motility: in the dark, it aggregates at a low O sub(2) tension and in bright light it aggregates in anoxic water. The oxic-anoxic boundary is also a zone where O sub(2) may be a scarce and transient resource, but Loxodes) can switch to nitrate respiration and exploit the pool of nitrate that often exists close to the base of the oxycline.
    Schlagwort(e): Biology ; Ecology ; Anoxic conditions ; Dissolved oxygen ; Ecophysiology ; Freshwater lakes ; Light effects ; Physiochemical properties ; Turbulence ; Vertical migrations ; Loxodes ; England ; Cumbria ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 33-56
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  • 79
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5247 | 3949 | 2011-09-29 15:08:19 | 5247 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The dace, Leuciscus leuciscus (L.) is an important cyprinid in terms of population biomass in chalk streams of southern England. Dace recruitment has been shown to vary widely from year to year and it is thought that this variation is largely as a result of the influence of abiotic factors, chiefly water temperature. From 1968 to 1981 there was a thirteen-fold difference in the year class structure index between the minimum index (0.25 in 1972) and the maximum (3.21 in 1976). The problems of such variation, especially those that could ensue from a succession of poor year-classes, are offset by the spread of reproductive effort by each female over several years.
    Schlagwort(e): Biology ; Chemistry ; Fisheries ; Abiotic factors ; Age composition ; Annual variations ; Climate ; Fecundity ; Fish eggs ; Fish larvae ; Freshwater fish ; Life history ; Mortality ; Population dynamics ; Predation ; Recruitment ; Sexual reproduction ; Survivial ; Water temperature ; Cyprinidae ; Leuciscus leuciscus ; England ; Dorset ; Chalk streams ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 83-96
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  • 80
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5257 | 1256 | 2011-09-29 15:09:23 | 5257 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Phosalone is a non systematic, wide spectrum organophosphate pesticide which was discovered in 1961 in the laboratories of the Societe des Usines Chimique Rhone-Poulenc in France. It has been approved for commercial use since 1964 in France, in Australia since 1966, in the United Kingdom in 1967 and in many other countries including Japan, Egypt, USSR and the USA. This study provides a full literature review on all aspects of phosalone including its physical, biological and chemical characteristics, and analytical methods of analysis with particular reference to soils/sediments. Furthermore, it aims to develop a method for the determintion of phosalone in aquatic sediments and to determine the adsorption of phosalone onto kaolinite.
    Schlagwort(e): Chemistry ; Limnology ; Pollution ; Insecticides ; Metabolism ; Toxicity ; Biodegradation ; Adsorption
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 54
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  • 81
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5249 | 3949 | 2011-09-29 15:08:57 | 5249 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The segregation of habitats of fish assemblages found in the chalk streams and rivers within the Wessex, South West and Southern Water Authority boundaries in southern England have been examined. Habitat segregation is the most frequent type of resource partitioning in natural communities. The habitat of individual fish species will be defined in order to determine the following: (1) the requirements of each species in terms of depth, current velocity, substrate, cover etc.; (2) identify the essential habitat variables in the segregation of species; (3) whether species in an assemblage demonstrate resource partitioning with reference to habitat, and (4) the mechanisms behind such resource partitioning.
    Schlagwort(e): Ecology ; Fisheries ; Freshwater fish ; Research proposals ; Rivers ; Species diversity ; England ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 88-90
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  • 82
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5260 | 1256 | 2011-09-29 15:09:28 | 5260 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: As one part of an on-going programme concerned with environmental protection as provided for under the terms of a UK/USSR Joint Environmental Protection Agreement signed in London, 21 May 1974, a seminar — ”The elaboration of the scientific basis for monitoring the quality of surface water by hydrobiological indices” was held at Valdai in Russia 12—14 July, 1976. As a continuation of this theme it was agreed that delegations of hydrobiologists from each side should carry out reciprocal visits to carry out comparative field tests on selected systems of biological surveillance in use in the respective countries. In May 1978 a team of British hydrobiologists visited the USSR, under the auspices of the Department of Environment, to carry out joint exercises on the River Dnieper and some tributaries. This paper reports the results of selected methods used by the British side when applied to the conditions found in the River Dnieper.
    Beschreibung: UK Hydrobiologists' Report - Pollution Report No.8
    Schlagwort(e): Biology ; Ecology ; Limnology ; Sampling ; Samplers ; Methodology ; Rivers ; International cooperation ; Water reservoirs ; Ukraine ; Dnieper River
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 21
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  • 83
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5258 | 1256 | 2011-09-29 15:09:25 | 5258 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The first bilateral study of methods of biological sampling and biological methods of water quality assessment took place during June 1977 on selected sampling sites in the catchment of the River Trent (UK). The study was arranged in accordance with the protocol established by the joint working group responsible for the Anglo-Soviet Environmental Agreement. The main purpose of the bilateral study in Nottingham was for some of the methods of sampling and biological assessment used by UK biologists to be demonstrated to their Soviet counterparts and for the Soviet biologists to have the opportunity to test these methods at first hand in order to judge the potential of any of these methods for use within the Soviet Union. This paper is concerned with the nine river stations in the Trent catchment.
    Beschreibung: Bilateral study of methods 1 - Pollution Report No.8
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Sampling ; Statistical sampling ; Samplers ; International cooperation ; Methodology ; England ; Trent River
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 65
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  • 84
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5262 | 1256 | 2011-09-29 15:09:47 | 5262 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The processes which control the growth, composition, succession and loss from suspension of phytoplankton algae are briefly reviewed, with special reference to function in eutrophic reservoir systems. The ecology of larger algal biomasses supported by high nutrient loading rates are more likely to be subject to physical (wash-out, underwater light penetration, thermal stability and mixing) than to chemical constraints. Sudden changes in the interactions between physical factors temporarily impair the growth of dominant algal species, and advance the succession. Certain algae may be cropped heavily, but selectively, by zooplankton feeding, but they are rarely the species which cause problems in waterworks practice. Grazing, however, does influence succession. A deeper understanding of the operation of loss control mechanism is urgently required. Potentially, manipulation of the physical environment provides an important means of alleviating day-to-day algal problems in eutrophic reservoirs; in terms of cost effectiveness these may prove to be more attractive than reducing nutrient loads at source.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Freshwater lakes ; Eutrophication ; Algae ; Algal blooms ; Phytoplankton
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 85
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5256 | 1256 | 2011-09-29 15:09:21 | 5256 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This is the final report on the research project to develop predictive models to quantify algal blooms in relation to environmental variables. The project's objectives were to develop models simulating the impact of vertical structure and mass transfer upon the dynamics of planktonic algae, including cyanobacteria, in lakes and reservoirs, to assess the potential of sedimentary phosphorus to sustain algal growth following reduction in external loading and to expand and enhance formulations to predict behaviour of blue-green algal populations and to incorporate these into a model software package. As part of the project a strategy for the production of a user-friendly packaging for the modelling software PROTEC-2 adaptable to particular sites was developed.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Modelling ; Algae ; Algal blooms ; Computer programs ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 93
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  • 86
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5254 | 1256 | 2011-09-29 15:09:03 | 5254 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Bassenthwaite (Lake) is one of the larger Cumbrian lakes, certainly one of the most distinctive, and of considerable conservation and amenity value. Although its shores lack sizeable settlements, its main inflow receives sewage effluent from a major tourist centre (Keswick) and is subject to episodic floods. These influences, the growing development of leisure activities at the lake (e.g. sailing, time-share units), and recent road-construction, have led to past appraisals of ecological impacts and lake management. The lake has not been the subject of intense and long-term ecological study, but much scattered information exists that is relevant to future management decisions. In the present Report, commissioned by North West Water, such information - published and unpublished - is surveyed. Especial attention is given to evidence bearing on susceptibility to change, affecting the lake environment and its biota or species of conservation interest. Extensive use has been made of the results of a recent (1986-7) seasonal survey by the FBA.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater lakes ; Freshwater ecology ; Limnology ; Hydrology ; Phytoplankton ; Zooplankton ; Freshwater fish ; Benthos ; England ; Bassenthwaite Lake
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 93
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  • 87
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5250 | 3949 | 2020-08-23 05:42:00 | 5250 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Genetic engineering now makes possible the insertion of DNA from many organisms into other prokaryotic, eukaryotic and viral hosts. This technology has been used to construct a variety of such genetically engineered microorganisms (GEMs). The possibility of accidental or deliberate release of GEMs into the natural environment has recently raised much public concern. The prospect of deliberate release of these microorganisms has prompted an increased need to understand the processes of survival, expression, transfer and rearrangement of recombinant DNA molecules in microbial communities. The methodology which is being developed to investigate these processes will greatly enhance our ability to study microbial population ecology.
    Schlagwort(e): Biology ; Ecology ; Environment ; Aquatic environment ; Genetics ; Microorganisms ; England ; Annual report
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 91-107
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  • 88
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5261 | 1256 | 2011-09-29 15:09:45 | 5261 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Both chemical and biological methods are used to assess the water quality of rivers. Many standard physical and chemical methods are now established, but biological procedures of comparable accuracy and versatility are still lacking. This is unfortunate because the biological assessment of water quality has several advantages over physical and chemical analyses. Several groups of organisms have been used to assess water quality in rivers and these include Bacteria, Protozoa, Algae, macrophytes, macroinvertebrates and fish. Hellawell (1978) provides an excellent review of the advantages and disadvantages of these groups, and concludes that macroinvertebrates are the most useful for monitoring water quality. Although macroinvertebrates are relatively easy to sample in shallow water (depth 〈 1m), quantitative sampling poses more problems than qualitative sampling because a large number of replicate sampling units are usually required for accurate estimates of numbers or biomass per unit area. Both qualitative and quantitative sampling are difficult in deep water (depth 〉 1m). The present paper first considers different types of samplers with emphasis on immediate samplers, and then discusses some problems in choosing a suitable sampler for benthic macroinvertebrates in deep rivers.
    Schlagwort(e): Ecology ; Engineering ; Limnology ; Sampling ; Samplers ; Methodology ; Rivers ; Invertebrate larvae ; Benthos ; Benthic environment
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 15
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  • 89
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5255 | 1256 | 2011-09-29 15:09:19 | 5255 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Bassenthwaite (Lake) is one of the larger Cumbrian lakes, certainly one of the most distinctive, and of considerable conservation and amenity value. Although its shores lack sizeable settlements, its main inflow receives sewage effluent from a major tourist centre (Keswick) and is subject to episodic floods. These influences, the growing development of leisure activities at the lake (e.g. sailing, time-share units), and recent road-construction, have led to past appraisals of ecological impacts and lake management. The lake has not been the subject of intense and long-term ecological study, but much scattered information exists that is relevant to future management decisions. In the present Report, commissioned by North West Water, such information - published and unpublished - is surveyed. Especial attention is given to evidence bearing on susceptibility to change, affecting the lake environment and its biota or species of conservation interest. Extensive use has been made of the results of a recent (1986-7) seasonal survey by the FBA.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater lakes ; Freshwater ecology ; Limnology ; Hydrology ; Phytoplankton ; Zooplankton ; Freshwater fish ; Sediments ; England ; Windermere Lake
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 150
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  • 90
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5263 | 1256 | 2011-09-29 15:09:49 | 5263 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The word ”Broads” is used to describe a series of relatively shallow lakes resulting from the flooding of medieval peat diggings. Broadland is essentially freshwater, but because the rivers have such low gradients the lower reaches are brackish. The influence of tide is particularly apparent on the River Yare; in Norwich 40 km from the sea there is a vertical movement of half a metre at spring tide. This study examines the problems that the broadlands are facing. The problems are basically the progressive loss of aquatic plants, in particular the macro- phytes, animal life, outbreaks of avian botulism, occasional fish kills due to a toxin produced by the blue-green alga Prymesium parvum and the emergence of very heavy algal blooms. The main factor for the deteriation of the Broaslands is the eutrophication resulting from enhanced nutrient inputs, in particular of nitrates and phosphates, from a variety of sources. The most important of these are sewage effluents, agricultural drainage, which includes fertilisers and nutrient rich effluents from piggeries and dairy un
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Freshwater lakes ; Eutrophication ; Algae ; Algal blooms ; Phytoplankton ; Pollution effects ; Water quality ; England
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 91
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5264 | 1256 | 2011-09-29 15:10:04 | 5264 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Technological progress, having reached in our time an unprecedented speed, is still increasing the rate of mineral extraction, industrial construction, and the mastering of new kinds of energy is growing. Correspondingly the anthropogenic load on the biosphere is increased and that requires the comprehensive development of monitoring the anthropogenic changes in the natural environment. Among problems resulting from the scientific-technological development, a noticeable place is given to the problem of pure water. Surface land waters proved to be a sensitive link in the natural environment. The hydrobiological service for observations and control of the surface waters is one of the subsystems of the State/Federal Service for Observations and Control of pollution levels in environmental objects, conducted by the USSR State Committee for Hydrometeor- ology and Control of the Natural Environment. This paper summarises the the main principles of the organisation and goals of the national system of monitoring of the state of the natural environment in the USSR.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Monitoring ; Water policy ; Water bodies ; Pollution control ; Water quality control ; Russia ; USSR
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 7
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  • 92
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5267 | 1256 | 2011-09-29 15:10:12 | 5267 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: In the study of questions relating to the quality of raw water and the biological produc- tivity of water bodies algal indicators have an important place. Despite the importance of these functional indicators in determining the quality of water and the nature of the production processes as a basis for preserving the ecological equilibrium of aquatic ecosystems, their use in the system of hydrobiological methods of monitoring the quality of surface water has not received proper consideration. This paper aims to analyse the matter and the possibl use of functional algal criteria in the system for the biological monitoring of aquatic objects and also to give some results in using these criteria.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Methodology ; Ecosystem management ; Water quality control ; Algal culture ; Tests ; Test organisms
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 13
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  • 93
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5265 | 1256 | 2011-09-29 15:10:07 | 5265 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: In accordance with the plan for joint Anglo-Soviet scientific and technical collaboration on environmental problems, the comparative evaluation of systems of hydrobiological analysis of the surface water quality started in 1977 at the Regional Laboratory of the Severn-Trent Water Authority in Nottingham were continued in the spring of 1978. The investigations were carried out under the auspices of the Institute of Hydrobiology of the Academy of Sciences of the Ukrainian SSR. Hydrobiological and hydrochemical samples were collected by Soviet and British specialists from the Kiev reservoir and the rivers Dnieper, Sozh, Desna and Snov. The samples were processed on the expedition ships and in the Laboratory for the Hydrobiology of Small Water Bodies of the Institute of Hydrobiology of the Academy of Sciences of the Ukrainian SSR. The possible approved methods to be adopted were evaluated from the samples using the phytoperiphyton, phytoplankton, zooplankton and zoobenthos against a background of hydrochemical characteristics. The study concludes that weather conditions complicated the work on testing the systems of biological indication of water quality and made it inadvisable to use those methods of comparison which were used when similar work was carried out in Nottingham.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Sampling ; Methodology ; Rivers ; International cooperation ; Water reservoirs ; Indicators ; Surveys ; Ukraine ; USSR
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 29
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  • 94
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    Freshwater Biological Association | Ambleside, UK
    In:  info@fba.co.uk | http://aquaticcommons.org/id/eprint/5273 | 1256 | 2011-09-29 15:10:33 | 5273 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: The surface temperature of Windermere has been recorded by the staff of the Freshwater Biological Association on every weekday (with a few minor exceptions) since 11 January 1933. This publication presents this information in a form which can easily be used by individual research workers. There are 43 tables (1 for each year, 1933-1975) which give the data, expressed as degree-days centigrade. The tables show for each month the number of degree-days above each temperature from 0 degree C to the highest recorded, at 1 degree C intervals. Mean temperatures are obtained by dividing the number of degree-days over 0 degree C by the relevant number of days. The advantage of degree-days rather than mean temperatures is that degree-days are additive so data for any desired periods may be combined quickly and simply. Seasonal results for spring, summer, autumn and winter are presented in tabular form, as are selected totals for comparisons between years. Further tables give the mean temperature in each month of the year, and the frequency distributions of monthly mean temperatures.
    Schlagwort(e): Ecology ; Limnology ; temperature measurement ; annual variations
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 60
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  • 95
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5266 | 1256 | 2011-09-29 15:10:09 | 5266 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: Guided by experience and the theoretical development of hydrobiology, it can be considered that the main aim of water quality control should be the establishment of the rates of the self-purification process of water bodies which are capable of maintaining communities in a state of dynamic balance without changing the integrity of the ecosystem. Hence, general approaches in the elaboration of methods for hydrobiological control are based on the following principles: a. the balance of matter and energy in water bodies; b. the integrity of the ecosystem structure and of its separate components at all levels. Ecosystem analysis makes possible a revelation of the whole totality of factors which determine the anthropogenic evolution of a water body. This is necessary for the study of long-term changes in water bodies. The principles of ecosystem analysis of water bodies, together with the creation of their mathematical models, are important because, in future, with the transition of water demanding production into closed cycles of water supply, changes in water bodies will arise in the main through the influence of 'diffuse' pollution (from the atmosphere, with utilisation in transport etc.).
    Schlagwort(e): Ecology ; Limnology ; Pollution ; Methodology ; Ecosystem management ; Ecosystems ; Water quality control ; Modelling ; Hydrobiology ; Water bodies
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 96
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5280 | 1256 | 2011-09-29 15:11:13 | 5280 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: C. pseudogracilis , was first seen in the South Basin of Windermere in 1960. The colonization of the lake from South to North is described (1961 to 1964). The relationship with Asellus and Gammarus is mentioned. Possible reasons for its successful colonization are discused as are the methods by which it may have been transported to the lake.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Malacostraca ; colonization ; Freshwater crustaceans ; England ; Lake Windermere
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 13
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  • 97
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5274 | 1256 | 2011-09-29 15:10:35 | 5274 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This bibliography covers published and unpublished work on the freshwater sections of the rivers North Tyne, Wear, Tees and Swale, their catchment areas and their tributaries. 393 references are included in the bibliography.
    Schlagwort(e): Ecology ; Limnology ; Rivers ; Bibliography ; England
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 54
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  • 98
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5276 | 1256 | 2011-09-29 15:10:59 | 5276 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This bibliography covers the literature up to the end of 1978. The criteria used in the selection of references were that they should aid identification of invertebrates directly; thus, works solely concerned with the taxonomy of a particular group are in general omitted unless they contain a key. Some check-lists are however included where they give current nomenclature. The references are arranged alphabetically within each group and deal mainly with macro-invertebrates but include available keys to some microscopic invertebrates. Internal parasites and hymenopterous parasitoids are omitted. For insects the life stages to which the key applies are given where this is not clear in the reference. A number of keys to non-aquatic stages have been included in the hope that they may prove useful in certain circumstances. In addition, under a general head, latest check-lists are referred to together with bibliographies of algal keys and a guide for the identification of British water plants.
    Schlagwort(e): Biology ; Ecology ; Limnology ; freshwater crustaceans ; freshwater molluscs ; invertebrate zoology ; literature reviews ; aquatic animals
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 99
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5279 | 1256 | 2011-09-29 15:11:11 | 5279 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This annotated bibliography is intended to give as reasonably complete a review of the existing literature as possible, and to offer some practical guidance in the selection and operation of sediment traps in future monitoring programmes.
    Schlagwort(e): Biology ; Ecology ; Limnology ; literature reviews ; particle settling ; collecting devices
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 54
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  • 100
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    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5277 | 1256 | 2011-09-29 15:11:01 | 5277 | Freshwater Biological Association
    Publikationsdatum: 2021-07-09
    Beschreibung: This bibliography covers the literature published by the Freshwater Biological Association between the years 1929-1978.
    Schlagwort(e): Biology ; Ecology ; Limnology ; Freshwater biology ; Bibliographies
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 133
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