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  • Articles  (437)
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  • Articles: DFG German National Licenses  (437)
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  • Biology  (350)
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  • 1
    Electronic Resource
    Electronic Resource
    Lake Chivero: A management case study (2003)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 8 (2003), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Lake Chivero in Zimbabwe was shown to be hypereutrophic. Historical data showed that the eutrophication process had been arrested in the late 1970s. However, a combination of poor planning, multiplicity of jurisdiction, mismatch between rate of urbanization and waste management investment, recent changes in the local climate and a permissive, immature political system that called for no public accountability resulted in environmental management breakdown leading to hypereutrophication of the lake. The case of Lake Chivero is presented as an example of a wider global issue regarding the status of environmental management in competition with other priorities in emerging democracies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1320-5331.2003.00214.x
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  • 2
    Electronic Resource
    Electronic Resource
    Management criteria for lake ecosystems applied to case studies of changes in nutrient loading and climate change (2003)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 8 (2003), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: The aim of this paper is twofold: to present and discuss practically useful management criteria from different perspectives of lake management (fishery, recreation, conservation, monitoring of water quality and use of water for irrigation and drinking), and to put these criteria into the context of a holistic lake ecosystem model, LakeWeb, which accounts for production, biomasses, predation and abiotic/biotic feedbacks related to nine key functional groups of organisms constituting the lake ecosystem. These are phytoplankton, benthic algae, macrophytes, bacterioplankton, herbivorous zooplankton, predatory zooplankton, zoobenthos, prey fish and predatory fish. The LakeWeb model also includes a mass-balance model for phosphorus and calculates bio-uptake and retention of phosphorus in these groups of organisms. It also includes submodels for the depth of the photic zone and lake temperature. The LakeWeb model is driven by few and readily accessible driving variables and it has been extensively tested and shown to capture fundamental lake foodweb interactions very well, which should lend credibility to the scenarios discussed in this paper regarding the conditions in Lake Batorino, Belarus. The LakeWeb model offers a tool to address important, often very complex, scientific problems in a realistic manner. The first scenario describes the changes after 1990 when there was a drastic reduction in the use of fertilizers in agriculture because of political changes and the corresponding changes in lake characteristics and foodweb structures utilizing the given management criteria. The second scenario describes, for comparative purposes, the probable alterations in the lake foodweb related to global climatic changes; in this case, warming and increased temperature variations. This study indicates that there are several similarities between eutrophication and increases in temperatures, which are discussed in this paper along with the mechanistic reasons related to such changes by using a set of general management criteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1320-5331.2003.00216.x
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  • 3
    Electronic Resource
    Electronic Resource
    The impact of tourism on dune lakes on Fraser Island, Australia (2003)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 8 (2003), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: In view of the increasing tourism to Fraser Island, Queensland, a tourist pressure index (TPI) was developed to assess the potential threat of tourism to 15 of the most accessible dune lakes on the island. Tourist pressure index scores indicated that the two clear lakes on the island, Lake McKenzie and Lake Birrabeen, are most threatened by tourist activities owing to their accessibility, facilities and prominence in advertising campaigns. In addition, limnological investigations of the same 15 lakes were conducted in February 1999 to determine their current trophic status and potential susceptibility to adverse impacts from tourism, particularly with reference to eutrophication. On the basis of nutrient and chlorophyll a concentrations, the two water table window lakes, Ocean Lake and Lake Wabby, were classed as mesotrophic and oligo-mesotrophic, while all of the perched dune lakes were oligotrophic. Lake McKenzie and Lake Birrabeen, the two most threatened lakes according to TPI scores, had the lowest nutrient concentrations of all of the lakes examined and, consequently, we suggest that nutrient additions might elicit rapid algal growth responses in these systems. Comparisons between current data and historical data from Arthington et al. (1990) indicate that increases in planktonic chlorophyll a concentrations were not always directly mirrored by increases in total phosphorus concentrations. We found that while chlorophyll a concentrations were significantly higher in the 1999 samples than in the 1990 samples for all lakes, total phosphorus concentrations were higher in Ocean Lake, lower in Lake Jennings and similar in lakes McKenzie, Birrabeen and Wabby.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2003.00205.x
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  • 4
    Electronic Resource
    Electronic Resource
    The spatio-temporal characteristics of water transparency and temperature in shallow reservoirs in Kenya (2003)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 8 (2003), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Water transparency and temperature in eight small reservoirs, ranging from 0.065–0.249 km2, in a rugged escarpment landscape and stepped plateau in the Eastern Rift Valley of Kenya were investigated between 1998 and 2000. Water transparency and temperature were measured with a 20-cm Secchi disk and a portable Jenway probe, respectively. The water transparency ranged from 0.02–0.8 m, which was low, but still similar to some larger reservoirs in the country (such as Masinga Dam). Reservoirs in the rugged escarpment had more water transparency than those in the high altitude plateau. The mean temperature ranged from 15–21°C. The reservoirs were either hypertrophic or oligo-mesotrophic, and mostly polytrophic, based on their water transparency in accordance with the trophic status classification of the Organization for Economic Cooperation and Development. Most of the reservoirs experienced short-lived stratification during the transition from the dry to rainy seasons. The results did not illustrate large spatio-temporal variability in water transparency or temperature, mainly because of physiographic and ecohydrological uniformity. All the reservoirs were considered to be in a poor state of domestic water quality, based on their water transparency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1770.2003.00226.x
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  • 5
    Electronic Resource
    Electronic Resource
    Contents Volume 8, 2003 (2003)
    Melbourne, Australia : Blackwell Science Pty
    Lakes & reservoirs 8 (2003), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1770.2003.220_4.x
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  • 6
    Electronic Resource
    Electronic Resource
    Bacterioplankton production in a water column of Lake Biwa (2002)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 7 (2002), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Seasonal production of bacterioplankton in a water column of Lake Biwa was examined based on cell-specific growth rates at above (surface layer) and below the thermocline (deep layer). The growth rates were estimated by incubating bacterioplankton in situ with a dilution technique. The rates ranged from 0.05 per day in winter to 0.89 per day in summer, generally with much higher rates in the surface layer than in the deep layer. In an entire water column, bacterial production (in terms of carbon [C]) ranged from 0.217 to 0.811 gC/m2 per day with a mean of 0.451 gC/m2 per day, which, on average corresponded to 43% of primary production. However, no significant correlation was detected between bacterial production and primary production rates. Although the bacterial production rate correlated positively to water temperature, surface and deep layer rates were comparative for some dates because the deep layer shared a large fraction of the water column. These results suggest that, although specific bacterial activity was low in the deep layer due to the low temperature, bacteria in that layer play substantial roles in consumption of organic matter and material flows in Lake Biwa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2002.00197.x
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  • 7
    Electronic Resource
    Electronic Resource
    Referees (2002)
    Melbourne, Australia : Blackwell Science Pty
    Lakes & reservoirs 7 (2002), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2002.t01-1-00202.x
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  • 8
    Electronic Resource
    Electronic Resource
    Using bald eagles to indicate the health of the Great Lakes' environment (2002)
    Oxford, UK : Blackwell Science Pty
    Lakes & reservoirs 7 (2002), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: The bald eagle (Haliaeetus leucocephalus) is one of the most studied birds of North America, and a great amount of natural life-history information, including the response of various stressors on the eagles' ability to reproduce, are well known. In Michigan, the eagle has been chosen to track the trends of bioaccumulative compounds of concern across watersheds in the state. The state has been divided into major watersheds, and 20% of these are surveyed each year. A control area in northern Minnesota, Voyageurs National Park, is also sampled annually. We report here on the methods used, the preliminary results of the 1999 field season, and how differences in mercury concentrations varied over a 10-year period. Mercury in feathers of nestling eagles declined over time only in Lakes Michigan and Huron, but have not decreased among other subpopulations in Michigan. Concentrations of polychlorinated biphenyls (PCBs) and 4,4′-DDE in blood plasma from nestling eagles have declined over time for most subpopulations; however, they remain greater for breeding areas associated with the Great Lakes' food web. Sea eagles of the genus Haliaeetus are a good sentinel species to track trends in bioaccumulative compounds in aquatic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2002.00186.x
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  • 9
    Electronic Resource
    Electronic Resource
    Water use (and abuse) and its effects on the crater-lakes of Valle de Santiago, Mexico (2000)
    Melbourne, Australia : Blackwell Science Pty
    Lakes & reservoirs 5 (2000), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Most Mexicans live in the arid and semiarid regions that represent two-thirds of the Mexican territory, where water is scarce. Natural, as well as human, causes are favouring the degradation of Mexican lakes. There is a clear need to develop and implement sustainable water-use programmes at a catchment scale. However, the accelerated degradation rate of the Mexican lakes means that there will not be enough time to perform whole-basin evaluations to establish sustainable water-use programmes before the lakes dry up. The case of the Valle de Santiago crater-lakes clearly illustrates the declining trend that Mexican inland aquatic resources follow. Vegetation clearance, overgrazing, abatement of phreatic waters and salinization have induced severe erosion and overall desertification (land degradation) in the basin for what, it seems, a long time (i.e. prehispanic times). In this way, human activities could be provoking at least the following negative consequences: a hotter and drier local climate, water scarcity, dust storms and soil salinization. The aquatic (surface and groundwater) resources of the Valle de Santiago basin have been seriously threatened. Two of the four crater-lakes have already dried up and phreatic mantle abatement reaches up to 2.5 m per year. In spite of these facts, no sustainable water-use programme has been established yet. The future scenery of this Mexican basin looks alarmingly like many other basins in the central and northern Mexican territories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2000.00113.x
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  • 10
    Electronic Resource
    Electronic Resource
    Top-down biological controls on tropical lake productivity (2000)
    Melbourne, Australia : Blackwell Science Pty
    Lakes & reservoirs 5 (2000), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: Although productivity is primarily controlled by bottom-up factors (nutrient levels), there are secondary effects caused by biological factors such as zooplankton grazing and algal self-shading. The measurement of grazing effects and determination of the contributions of different nutrient pools should elucidate the roles of nutrient levels and biotic effects and also infer the relative importance of classical and microbial food webs. To produce a series of grazing intensity, after initial screening to remove macrozooplankton, lake water was filtered to remove remaining zooplankton. This was used to dilute whole lake water in a filtered : unfiltered ratios from 0:1 to 1:0, which was then incubated with nutrient enrichment. Results show an increase of up to 20% in productivity for surface midlake waters. To investigate grazing by nutrient dilution/deletion, grazing dilutions were again prepared; however, nutrients were added to produce three different conditions,+N +P (all nutrients), –N (nitrogen omitted) and –P (phosphorus omitted). From productivity measurements, the contributions of internal, external and recycled nitrogen and phosphorus nutrient pools were calculated. Sites at Hippo Point (HP) (midlake) and Malewa River inflow (MR) (near the mouth of the River Malewa) show little difference in the contribution of external nutrients, but remaining productivity is mostly fuelled by recycled nutrients at the MR site. Little difference was found between nitrogen and phosphorus-limited conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2000.00112.x
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