Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Freshwater lakes"”.
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Effects of water color on food web structure in freshwater lakes
Water color has multiple effects on freshwater lakes, changing the vertical profiles of light, temperature, and oxygen. Therefore, increased water color should reduce planktivory by visually guided fish, but invertebrate predators such as Chaoborus should become more important. Since fish prefer …
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Using Hplc and Pcr-Dgge for the Assessment of Phytoplankton and Bacterioplankton Communities in Scottish Freshwater Lakes
… assessment of the plankton community in Scottish freshwater lakes. Phytoplankton composition and biomass were determined using microscopy and HPLC, while bacterioplankton density and diversity were assessed using flow cytometry (FC), epifluorescence microscopy (EPM), and PCR-DGGE respectively. …
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Forbidden (sacred) lakes and conservation: the role of indigenous beliefs in the management of wetland resources in the Niger Delta, Nigeria
… studies of the belief systems and use of four freshwater lakes, one sacred and one non-sacred, in each of two communities, Biseni and Osiama in Bayelsa State, were conducted. A combination of in-depth interviews, focus group discussions, participant observation, structured questionnaires and …
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What lies beneath? Fungal diversity at the bottom of the Great Lakes
… Even less is known about fungi inhabiting freshwater lakes, particularly the benthic zone that may serve as an untapped resource for fungal biodiversity. This study aimed towards understanding the diversity of fungi in one of the largest freshwater systems on Earth, the North American …
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An improved geography of surface water abundance in lakes and reservoirs
… and social importance. The great mass of liquid freshwater, which is readily accessible to human beings, resides in major surface stocks such as lakes, ponds, and reservoirs. Unfortunately, because of the extensive distribution and dynamic nature of global surface water bodies, our knowledge of …
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Magnitude and spatio-temporal variability of methane emissions from a eutrophic freshwater lake
… methane can be released to the atmosphere from freshwater lakes, particularly through bubbling. However, spatial and temporal heterogeneity in ebullition has complicated efforts to accurately measure such methane emissions. This thesis presents the results from a two-year study of methane …
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Hypolimnetic Oxygenation Mitigates the Effects of Nutrient Loading on Water Quality in a Eutrophic Reservoir
… is predicted to have many diverse effects on freshwater lakes and reservoirs by increasing both hypolimnetic hypoxia and runoff, which will increase nutrient concentrations and degrade water quality. Hypoxic conditions can trigger the release of metals and nutrients from the sediments, i.e., …
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The Effects of Hypoxia on Zooplankton Communities in Lakes and Reservoirs
… Because of climate change and eutrophication, freshwater lakes and reservoirs are experiencing an increase in low dissolved oxygen concentrations (hypoxia) in their bottom waters (hypolimnion), which can disrupt ecological communities. Zooplankton, important aquatic organisms for regulating …
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Empirical Relationships between Water Quality and Agricultural Land Use in Rural Maine
Anthropogenic eutrophication of freshwater lakes due to land use change is a growing global problem with economic consequences, such as a reduction in shoreline property value. Managing eutrophication is of utmost importance in Maine, USA due to the large number of inland fresh waterbodies and …
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The Archaeology of Travel in Greater Nicoya (500 BC – AD 1250)
… land and canoeing or rafting over the large freshwater lakes and rivers, these peoples voyaged for many hours to trade goods and maintain social and political ties with their neighbors. The range and frequency of these interactions within this region is demonstrated by geochemically sourced …
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The use of image processing techniques for the automated detection of blue-green algae
The determination of water quality in freshwater lakes and reservoirs is an important task, which must be carried out on a regular basis. Information about long term water quality must be provided by the existence of particular organisms, for example blue-green algae. Currently the detection of …
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Identifying ecological differentiation in microbial communities across taxonomic scales
… was distributed within and between a set of freshwater lakes and also identified the ecological processes dictating this spatial distribution of diversity. Finally, at the highest resolution, I employed a comparative genomics approach to identify genomic signals of adaptive evolution in a …
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Computational study of hydro-environmental processes of Poyang Lake, China
Poyang Lake, the largest freshwater lake in China, plays a key role in regulating the hydrology, water quality and ecosystem in the middle reaches of the Yangtze River. Recent industrial development and urbanization in Jiangxi province have driven rapid increase in water consumption and …
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Dynamic chamber system for determining equilibrium phosphorus concentration (EPC0) in sediments
Eutrophication of lakes is a major driver promoting algal blooms which have presented significant social, economic and ecological challenges to humanity. Phosphorus (P) is a common limiting nutrient in North American freshwater lakes including the Laurentian Great Lakes that is transported to …
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Using high resolution satellite imagery to map aquatic macropyhtes on multiple lakes in northern Indiana
… to quickly and accurately map aquatic plants in freshwater lakes and ponds for regulatory purposes, to monitor the health of native species and to monitor the spread of invasive species. Site surveys and transects are expensive and time consuming, and low resolution imagery is not detailed enough …
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The Response of Discostella Species to Climate Change at the Experimental Lakes Area, Canada
… Specifically, the influence of climate change on freshwater lakes includes decreased water availability, increased evapotranspiration, changes in nutrient availability, and shifts in species composition. Understanding the changes that are occurring to our freshwater ecosystems is imperative to …
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Effects of Low Bioavailable Nitrogen and Phosphorus on Cyanobacteria Dynamics in Eutrophic Lake Erie
The growth and abundance of phytoplankton in freshwater lakes has long been attributed to the concentration of phosphorus (P), and this idea of P-limitation has been a paradigm accepted by limnologists. Hence, lake managers have relied on the strategy of reducing P to restore water quality of …
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Building, applying, and communicating ecosystem understanding via freshwater forecasts over time and space
… predictions of future ecological conditions. Freshwater lakes and reservoirs, which provide numerous ecosystem services, are particularly threatened by global change stressors and have already exhibited substantial changes to their physical, chemical, and biological functioning. Thus, to …
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The Mzingazi gauging weir and its effects on the fish and macrocrustacean communities of Lake Mzingazi
Lake Mzingazi is a freshwater coastal lake in Richards Bay, KwaZulu-Natal. Because of ongoing industrial and residential developments in the Richards Bay area, the need for potable water increased and led to the construction of a weir across the outlet of Lake Mzingazi. The first weir on this …
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Space Use by Piscivorous Birds, Fish, and Humans on a Multi-Use Lake in Southern Saskatchewan
On the Great Plains of North America, freshwater lakes are a critical resource in a dry landscape. Recreational development and use of lakes, as well as industrial and agricultural uses, may alter habitat and water quality. Consequently, it is important to understand how economically important fish …
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