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 30 for “"trophic state"”.
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Landsat Trophic State Assessment of Fellows Lake
… LANDSAT remote sensing techniques for monitoring trophic state at Fellows Lake is examined. Data is obtained for ten individual scene days (thrity sample sites) covering a two year period. Models are derived for trophic state prediction based on trophic state indexes computed for chlorophyll a …
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An Examination of Trophic State Indices For Some Missouri Reservoirs
A variety of possible trophic state indicators is critically examined for applicability to nine Missouri reservoirs. Data presented are representative of collections made during the summer of 1978. Relationships between several physical, chemical, and biological properties are considered and the …
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Trophic State Monitoring Of Lakes And Reservoirs Using Remote Sensing
… there is increasing concern that anthropogenic eutrophication threatens the usability of these natural resources. Therefore, this research investigates these complex hydrologic ecosystems and recommends a methodology for monitoring the trophic state of lakes and reservoirs using remote sensing …
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Hydrothermal and water quality modelng for evaluation of Ashumet Pond trophic state
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Effects of lake trophic state and seasonal cycling on production and bioaccumulation of methylmercury in Te Arawa Lakes
… webs, leading to increased toxicity in higher trophic organisms. Given that fish constitute a significant component of the local diet, comprehensive monitoring of Hg and MeHg concentrations is essential for developing effective mitigation strategies. Such efforts are critical to controlling Hg …
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Sediment-Pore Water Chemistry of Taupo Volcanic Zone Lakes and the Effect Trophic State has on Exchange with the Water Column
… mixing regime (monomictic and polymictic), and trophic status (oligotrophic to supertrophic). The purpose of this study is to develop an understanding of the sediment-pore water interactions over a range of trophic conditions and how the biogeochemical cycles influence the lake ecosystem and the …
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Occoquan Reservoir and Watershed: A Water Quality Assessment 1973–2019
… indirect potable reuse systems in the United States. It in an important water supply source for the Northern Virginia area, as well as, an ecological and recreational area. Furthermore, the Occoquan Reservoir protects the water quality of the Chesapeake Bay because it acts as a trap for …
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The distribution and dynamics of planktonic rotifera in the North Island, New Zealand
… four central North Island lakes of contrasting trophic state and mixing regime: Lakes Tikitapu, Rotoiti, Okaro and Ngaroto. Total rotifer abundances were consistently lowest in winter. The temporal occurrence of species assemblages within lakes related to mixing pattern, with different …
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A quantitative study of the water quality and plankton of Upper Blue Lake, Lower Blue Lake, and the Oaks Arm of Clear Lake in Lake County, California
… collectively, are important indicators of the trophic state or nutrient condition of the waters of the three lakes from February through October 1972.
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Vergleichende Untersuchungen über den potentiellen Eintrag von Nährstoffen in den Wasserkörper von Talsperren durch Freisetzung aus dem Sediment
… influence on the release of nutrients and the trophic state. Due to the strong interactions between sediment and water body and the storage of materials sediments can be consulted as an important additional source of information for the evaluation of the trophic state and for the estimation of …
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The dynamics of ¹³C in several New Zealand lakes
… fresh water lakes varies with productivity and trophic state. (ii) Determine if such variations can be used for the investigation of lake palaeoenvironment. (iii) Quantify the effect of anthropogenic activity on the productivity of Hamilton Basin lakes. The viability of this project was assessed …
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Climate impact on phytoplankton blooms in shallow lakes
… subject to a simultaneous change in climate and trophic state during the past three decades. Data analysis included constructing a dynamic simulation model, implementing a genetic algorithm to parameterize models, and applying statistical techniques of classification tree and time-series …
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The Development and Evaluation of an Index of Biotic Integrity for Small Lakes in Western and Central New York
… and watershed data and a modification of the Trophic State Index (TSI). Results showed that neither the 181 or TSI could accurately assess the level of anthropogenic impact completely. Although the 181 was unable to correctly assess the level of impact on all study lakes, the results were …
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Nutrient dynamics in the Lake Manassas (Virginia) watershed
… less than had been previously thought. Trophic state indices indicated that Lake Manassas is eutrophic, and water column chemistry suggested phosphorus to be the limiting nutrient. The Vollenweider model was applied to illucidate the relative impacts of South Run and Broad Run on the …
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Assessing the spatiotemporal variation of phytoplankton biomass in Nandoni reservoir in the Vhembe District (South Africa) using LANDSAT satellite imagery
… proxy for phytoplankton biomass to determine the trophic state of the aquatic ecosystem. Traditional approaches for monitoring aquatic system are time consuming, expensive, and non–continuous, therefore, Remote Sensing technologies are qualitative for monitoring the status for water quality in …
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Influence of Food Web Structure and Environmental Conditions on Walleye Stocking Success in Two South Dakota Impoundments
… research at Mina Lake has shown increased trophic state, large proportions of benthic invertebrates consumed by stocked Walleye, and increased abundance of Freshwater Drum Aplodinotus grunniens, a benthic insectivore. The purpose of this study was to address several objectives related to …
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Modeling lake ecosystem change within coupled human-natural systems to improve water resources management
… serve as robust indicators of slowly-changing trophic state. I found that higher rates of near-shore GPP and R were partially due to stream-related variables, providing insight into how inflowing streams connect to in-lake processes. These two ecosystem assessment studies indicate fast-changing …
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Nano- e microfitoplâncton da Baía de Guanabara (RJ, Brasil) em condições tróficas distintas: aspectos estruturais e pré-funcionais
… abundance) and pre-functional (auto and heterotrophic components, biomass) aspects of the community. Sampling strategy included intensive sampling (weekly) for two and a half years (July/1998 - December/2000), at 0.5 m, at two sites with different water qualities: Urca (close to the entrance) e …
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Interactive effects of temperature, nutrient level and sandprawns (Kraussillichirus kraussi) ecosystem engineering on microplankton community structure
Global warming and eutrophication are leading global change stressors that threatened coastal environments. Water quality degradation has gained scientific attention in particular, especially from the perspective of finding nature-based solutions (NBS) to microbiological proliferation. Endobenthic …
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The effects of common carp on zooplankton communities using morphological and molecular techniques
… ecosystems are under threat from increased eutrophication, and in the Waikato region this is intensified with the presence of common carp (Cyprinus carpio). The overall aim of this thesis was to capture the environmental and biological changes of a natural pond environment when carp were …
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