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  • 1
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two workers drilling on Hindburn Force, North West England, UK, making it more accesible for passing fish. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
    Type: Image , NonPeerReviewed
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  • 2
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Photo of Hindburn Force Dam, North West of England, UK, including a fish pass. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
    Type: Image , NonPeerReviewed
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  • 3
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Three men electrofishing in an unknown a dry stream in North West England, UK, in the 50's. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 4
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Three men walking through the Stockdale Beck, North West England, UK, waiting for spawners in 1954. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 5
    Publication Date: 2011-09-29
    Description: Production measurements at different times of the year indicate a linear relationship of light intensity and overall production at about 8% of the visible light energy reaching plant level. Measurements of a coral reef at Eniwetok indicate 6%. Further evidence of breeding at all seasons but with a quantitative pulse in the seasons of maximum light indicates that the seasonal fluctuation in primary production is routed through reproduction rather than through major changes in populations. The succession of plants and anmals of the aufwuchs has been shown with glass slides and counts from Sagittaria blades. Losss of oxygen bubbles during the day and emergence of aquatic insects at night have been measured with funnels. Bell jar measurements are reported for bacterial metabolism on mud surfaces. pH determined CO2 uptake agrees with titration determinations. A few rough estimates of herbivore production have been made from caged snails, aufwuchs succession, and fish tagging. Nitrate uptake a night by aufwuchs communities has been confirmed in a circulating microcosm experiment as well as in bell jars in the springs. Distributions of oxygen and organisms have been used to criticize the saprobe stream classification system. Theoretical consideration of maximum photosynthetic rates in teh literature data indicates logarithmic rate variation inversely with organismal size just as for respiratory metabolism. Extreme pyramid shapes are thus shown for communities in which organismal size decreases up the food chain and for other communities with the same energy influx but with organismal size increasing up the food chain. Literature data is used to further demonstrate the validity of the optimum efficiency-maximum power principle for photosynthesis. Work on plants by Dr. Delle Natelson indicates essential stability of aquatic plant communities after 3 years and about 10-20% reproducibility in previous biomass estimates by Davis. Work on an animal picture of the fishery characteristics by Caldwell, Barry, and Odum is half completed. The study of aquatic insects in relationship to spring gradients by W.C. Sloan has been completed an an M.S. thesis. J. Yount has begun a study of affect of total productivity on community composition using aufwuchs organisms on glass slides placed in different current and light conditions in Silver Springs. (49pp.)
    Keywords: Ecology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 6
    Publication Date: 2011-09-29
    Description: Salt-water encroachment is undoubtedly the problem of most concern to users of ground water in Florida. This is a problem in many coastal areas where water levels are lowered excessively by heavy pumping. It is a problem also in some inland areas where the water-bearing formations contain salty water at relatively shallow depths. Among the coastal areas where wells have become contaminated with salt water are Pinellas County and the Miami area of Dade County. Inland areas where wells are likely to become contaminated with salt water include Seminole County and the southwestern part of Volusia County. The purpose of the investigation is to make a detailed study of the geology and ground-water resources of the county with special emphasis on the problems associated with declining water levels and salt-water contamination. This report reviews briefly the progress of the investigation through February 1954. (PDF contains 43 pages.)
    Keywords: Oceanography ; Limnology ; Earth Sciences
    Repository Name: Aquatic Commons
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  • 7
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Five fishermen pulling net in Black Moss Tarn. This photo is part of a photo album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology ; Management
    Repository Name: Aquatic Commons
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  • 8
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Five men electrofishing in Gleaston Beck, Cumbria, UK. This photo is part of a photo album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology ; Management
    Repository Name: Aquatic Commons
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  • 9
    Publication Date: 2011-09-29
    Description: Three ponds were chosen for this study. The two lower ones were of 2 - 4 hectares in area, the depth of the littoral zone was 2.5 - 3 metres at the time of maximum flooding and the mud which covered the floor of the ponds was homogeneous and autochthonous in nature with very few vegetable remnants. The ponds which were originally set up in 1950. were intended for water supply and populated with Crucian Carp (for human consumption). A survey was done in the ponds in order to establish number and biomass of Tendipes semireductus. The author concludes that in these ponds T.semireductus has 2-3 generations per year.
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 10
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two men in a small motor boat. The photo is called "Helm and Beaver" which is probably a location in the North West of England, UK. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 11
    Publication Date: 2011-09-29
    Description: By means of new methods it has been possible to measure the overall community metabolism as well as the standing state community in Silver Springs. Photosynthetic rates have been determined by downstream gradient methods, transplantation growth plots, and bell jars diurnally and annually. Respiration rates have been estimated with bell jars. The downstream losses of particulate, and dissolved organic matter have been found to balance, the excess of photosynthesis over respiration. The community has thus been demonstrated to be in a constant temperature, steady state, somewhat comparable to a climax on land. Nitrate, phosphate, and major chemical constituents are essentially constant. There is an approximate constancy of standing crop of organisms although the production rates in summer are three times those in the winter. Some evidence suggests that there, are photoperiodic changes in reproduction rates in spite of constant temperature. Rates of protein syntehsis estimated from nitrate uptake downstream agree (1) with photosynthetic quotients obtained from carbon dioxide and oxygen uptake downstream and (2) with the nitrogen content of the community. The overall annual production of 50,000 lbs/acre is the greatest productivity we know of on land or sea. Such high figures seem reasonable with the flow of high nutrient, warm water and high light intensity over a dense periphyton community. Theoretical concepts of steady state thermodynamics have been applied to show that self maintaining open systems tend to adjust to high power and low efficiency output. The 3% photosynthetic efficiency observed in Silver Springs is in agreement with this principle. Pyramids of weight and pyramids of number have been determined including bacteria. These pyramids are similar to some in the literature. The contribution of an acre of a fertile stream annually is readily inferred from data obtained on downstream increase of bacteria, chlorophyll, and organic matter. In other springs, Mr. Sloan has related stability of insect populations to chlorinity and to gradients of stability of environmental factors. Dr. L.S. Whitford during the summer made an ecological and taxonomic study of the distribution of algae in 26 contrasting springs. From this lists and from analytical data on the chemostatic water in these springs one can infer culture conditions necessary for many species. (27 pages)
    Keywords: Ecology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 12
    Publication Date: 2011-09-29
    Description: Work has begun on studying the factors responsible for productivity in the Florida springs, which are nearly constant temperature, constant chemical, steady state giant laboratories. Progress has been made on five aspects: qualitative description, quantitative description, completion of knowledge of chemical factors, measurement of productivity , development of productivity theory. Measurement of the primary productivity in Silver Springs and Green Cove Springs by two new methods: the raising of organisms in cages, and the measurement of night & day differences in oxygen downstream agree roughly. Production in these springs is greater than previous production figures reported for marine, fresh water, and land areas. Instantaneous measures of production show large variations with season, time of day, cloud cover. Production estimates range from 11,000 lbs per acre per year to 70,000 lbs. glucose per acre per year during daylight hours. Essential stability of the springs environment has been shown with respect to temperature, phosphorus, and plant cover. A correlation of species number with lack of stability has been shown with insects. Quantitative studies have shown very large plant base to pyramids of mass. Correlation of marine invasion with chlorinity has been shown. The essential aspects of pH regulated phosphorus geochemistry in Florida have been outlined. Some theoretical ideas on productivity have been evolved. Mapping of sessile organisms in springs and taxonomic identification of dominants are half completed. Plans for second six months include measurement of herbivore and carnivore production rates and completion of food chain efficiency determinations in Silver Springs as a preparation for subsequent comparisons between springs. (34pp.)
    Keywords: Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 13
    Publication Date: 2011-09-29
    Description: (PDF tiene 5 paginas.)
    Keywords: Oceanography ; Biology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 14
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Five men working in the reinforcement of the Sprint Mill weir in Cumbria, UK. This photo is part of a photo album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology ; Management
    Repository Name: Aquatic Commons
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  • 15
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: A worker drilling in Colton Beck,, North West England, UK, trying to make it more accessible for fish passing in 1953. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Engineering ; Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 16
    Publication Date: 2011-09-29
    Description: During this second six months emphasis has been laid on developing a complete understanding of the metabolism of the Silver Springs ecosystem as an example of a community apparently in a steady state. Variation in phosphates, uptake of nitrates, and importance of boron have been estimated. Fluctuation of some major elements has been estimated. Examination of stomach contents has permitted trophic classifications of dominant species and the standing crops have been estimated for these species by number and by dry weight. From these a pyramid of mass has been constructed. Special attention has been paid to bacteria using 3 methods for comparison of Silver Springs with lakes and estimation of the standing crop. The oxygen gradient method has been repeated at half hourly intervals. A carbon-dioxide gradient method has also been used to check the oxygen and to obtain a photosynthetic quotient. Black and light Bell jar experiments have been initiated to obtain checks on the other production measurement and to obtain a community respiration rate. An approximate balance has resulted from estimates of production , respiration , and downstream loss. A flow rate diagram has been constructed to clarify definitions of efficiency and their relationship to a steady state system. Mr. Sloan has statistically verified the increase of insect number and variety away from the boils and demonstrated the reliability of quantitative dipping for aquatic insects. Plans for the third half year include detained and comparative study of the dominant algae and further estimates of rates of growth of all community components. (29pp.)
    Keywords: Ecology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 17
    Publication Date: 2011-09-29
    Description: The purpose of the investigation is to make a detailed study of the geology and ground water in the Ruskin area, especially as related to the problem of salt-water encroachment. The major objectives of the program includes: (1) An inventory of wells to determine their number and distribution, their depths and diameters, and other pertinent information. (2) A study of artesian pressures. (3) Analyses of water from selected wells to determine the location and extent of any areas in which the artesian water is salty. (4) A study of the surface and subsurface geology as related to the occurrence and movement of ground water. (5) An estimate of the quantity of ground water withdrawn. (PDF contains 24 pages.)
    Keywords: Oceanography ; Limnology ; Earth Sciences
    Repository Name: Aquatic Commons
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  • 18
    Publication Date: 2011-09-29
    Description: Cases of mutual exclusion of two species of organisms in nature are known in large numbers. In the majority, they make different demands on the environ- ment which makes co-occurrence impossible. Less frequent are those cases in which a definite activity of one species prevents the occurrence of the other in the same region. An experiment was carried out n order to establish if Chydorus sphaericus can co-occur with water-snails. It emerged that a substance soluble in water which is given off by snails is responsible for the negative effect on small crustacea.
    Keywords: Biology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 19
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Three men planting out Sea trout ova in a beck in North West England, UK, in 1952. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
    Type: Image , NonPeerReviewed
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  • 20
    Publication Date: 2011-09-29
    Description: This study focusses on the plants in the open parts of the lake - mostly aquatic charophytes and mosses, in what are called in Lake Sevan (Armenia), the ”zones of chara and moss”. Distribution and other ecological conditions are reviewed. Quantity of chara in the littoral zone of lake Sevan is provided
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 21
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two men working in a weir and fish pass at Whitendale, North West England, UK. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Engineering ; Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 22
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Fish trap at Garstang weir in the River Wyre, North West of England, UK. This photo shows pollution in River Lune in July 1949. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 23
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: A fisherman with a hen pike caught on the 7.3.1950 at Baines Pool, North West of England, UK. This photo is part of a photo album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
    Repository Name: Aquatic Commons
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  • 24
    Publication Date: 2011-09-29
    Description: Cyclopids, exactly in the same way as daphnids, significant component in the nutrition of plankton-f and the young of the majority of fishes. It is established that the food spectrum of cyclopids is extremely broad: daphnids, planarians, Copepodite stages of copepods (cannibalism), rotifers, protists, bacteria, phytoplankton and so on. It is clear that the problem of studying these or other components of feeding in the general food spectrum can be definitely resolved only after obtaining exact quantitative data on the feeding of cyclopids. This article attempts to fill the gap in the study of the quantitative side of the feeding of cyclopias; in it is investigated the size of the 24-hour ration of cyclopids feeding on protists, the dependence of the ration on some factors of the external medium, and the difference of 24-hour consumption per unit weight of tody with two species of cyclopids (Cyclops strenuus and Cyclops viridis).
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 25
    Publication Date: 2011-09-29
    Description: The winter eggs of Daphnia pulex, after passing safely through the winter , develop and hatch in the spring, multiplying by themselves, while some males emerging among them with the changes in environment produce fertile eggs, which are universally known as winter eggs . This study researches the factors governing the development of winter eggs through experiments.
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 26
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two men working in a weir and fish pass at Whitendale, North West England, UK. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Engineering ; Fisheries ; Limnology
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  • 27
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    Universidad Nacional de la Plata
    Publication Date: 2015-06-01
    Keywords: Oceanography ; Biology ; Limnology
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    Type: Book Section , PeerReviewed
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  • 28
    Publication Date: 2011-09-29
    Description: A great deal has been written on the part which birds play in the dispersal of freshwater fauna. This article summarises literature on the dispersal of aquatic animals by birds and aquatic insects.
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 29
    Publication Date: 2011-09-29
    Description: This short paper summarises findings of experiments that were carried out using copepod eggs taken from guts of Coregonus which breeds in various Ural lakes. The study showed that copepod eggs can pass through the gut of Coregonus unharmed.
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 30
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Photo of a hatching cage in Tower Mill, an unidentified location in the North West of England, UK. The image was taken in 1950. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
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  • 31
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    Facultad de Ciencias Naturales, Universidad Nacional de La Plata
    Publication Date: 2010-12-09
    Description: Este trabajo surge de la monografía realizada por el autor para optar al título de Doctor en Ciencias Naturales de la Facultad de Ciencias Naturales y Museo, UNLP y trata sobre el pez sudamericano Salminus maxillosus Cuv. y Val., conocido popularmente bajo el nombre de "Dorado", (PDF tiene 72 paginas.)
    Keywords: Biology ; Limnology
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  • 32
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    Florida Geological Survey
    Publication Date: 2011-09-29
    Description: lGround water in Florida is the principal source of supply for industrial, municipal, agricultural, and domestic uses. During the last half century large developments of ground water have been made, and new developments are currently being addedi However, although problems of supply, some of them critical, have arisen in certain areas, vast quantities of ground water are:yet available for development over a major part of the State. It is quite conceivable that the availability of large developed water resources in Florida, in contrast with the shortages of supply in many other parts of the country, may play a dominant role in the agricultural and industrial growth of the State. (PDF has 15 pages.)
    Keywords: Limnology
    Repository Name: Aquatic Commons
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  • 33
    Publication Date: 2011-09-29
    Description: The caddisfly (Trichoptera) Sericostoma siculum was found in the Marche region in Italy. The article summarises biology and ecology of the caddisfly, focusing on the larvae stage.
    Keywords: Biology ; Ecology ; Limnology
    Repository Name: Aquatic Commons
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  • 34
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two fishermen and a boy transfering pike with a cylindrical keep net to Lancaster Canal, North West England, UK. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology
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  • 35
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    Environment Agency North West
    Publication Date: 2013-03-30
    Description: Two fishermen transfering pike using metal containers to the Lancaster Canal, North West of England, UK. This photo is part of a Photo Album that includes pictures from 1935 to 1954.
    Keywords: Fisheries ; Limnology ; Management
    Repository Name: Aquatic Commons
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  • 36
    Publication Date: 2011-09-29
    Description: The consumption of oxygen in Asellus aquaticus was measured to find if there existed a periodicity in the consumption of oxygen and how this showed itself during the course of the day, year and in various experimental conditions. From the figures obtained comparative values were calculated and from these curves were plotted of the changes in the consumption of oxygen during the day and year.
    Keywords: Biology ; Limnology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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