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 15 of 15 for “"eutrophic lakes"”.
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Carbon gains, losses, and feedbacks in shallow, eutrophic lakes of phytoplankton and macrophyte dominance
Lakes are increasingly being recognized as an important component of the global carbon cycle, yet anthropogenic activities that alter their community structure may change the way they transport and process carbon. This research focuses on the relationship between carbon cycling and community …
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Carbon dioxide and methane emissions from the Te Arawa lakes of Rotorua, New Zealand
… strategy. So far, inland waters, including lakes and reservoirs, have not been included in the global carbon cycle. However, the contribution of inland waters to global CO₂ and CH₄ emissions has been identified to be important. Inland waters are also known to be a major sink for GHG …
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Land Use Effects On Lake Water Quality In Central Florida
Land use affects the water quality of lakes. Different land use types yield different effects due to varying amounts and constituents of runoff. In this study, the effects of surrounding land use on the water quality of 50 lakes in Seminole County, Florida was assessed. Using GIS, I placed buffers …
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Assessing the use of Viviparus georgianus snails as a means for biomanipulation of cyanobacterial species Microcystis aeruginosa
… and can live at high densities in eutrophic lakes. The aim of this thesis is to assess the potential use of this snail species as a potential means for biomanipulation of the cyanobacterial species Microcystis aeruginosa. We assessed this by using chlorophyll a (chl-a) as a measure …
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Prediction of temporal and spatial phytoplankton change in Rutland Water
… succession was found to be similar to other eutrophic lakes although total annual biomass appeared to be suppressed as a result of the destratification equipment which caused high mixed depth (Zm) to euphotic depth (Zeu) ratios. Spring was dominated by diatoms, usually nutrient limited, with …
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The roles of secondary metabolites in microcystis inter-strain interactions
… Microcystis colonies are isolated from the eutrophic lakes near Potsdam, Germany and established as stably growing under laboratory conditions. In co-habitation simulations, the recently isolated field strain FS2 is shown to specifically induce nearly immediate aggregation reactions in the …
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Influence of Resource Pulses Following Stochastic Disturbances on Aquatic Food Webs
… is a highly abundant invasive fish in shallow eutrophic lakes throughout much of the world and is associated with deleterious effects on aquatic ecosystems due in part to nutrient subsidies provided through bioturbation and excretion. Shallow lakes dominated by common carp are often subject to …
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Effects of Low Bioavailable Nitrogen and Phosphorus on Cyanobacteria Dynamics in Eutrophic Lake Erie
… 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 eutrophic …
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Structural dynamics of community gene expression In a freshwater cyanobacterial bloom over a day-night cycle
… characterize the metatranscriptome of a tropical eutrophic drinking water reservoir dominated by the toxigenic cyanobacterium Microcystis aeruginosa over a day-night cycle. Cyanobacterial blooms are a major problem in eutrophic lakes and reservoirs, negatively impacting the ecology of the water …
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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
… Island of New Zealand and contains many volcanic lakes of diverse history, physiography, and limnology. The lakes vary in size (0.2 to 620 km2), mixing regime (monomictic and polymictic), and trophic status (oligotrophic to supertrophic). The purpose of this study is to develop an understanding of …
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Comparative analysis of meiobenthic diversity across habitats in ancient lakes
Freshwater ecosystems, including rivers, lakes, wetlands, and streams, serve as critical biodiversity reservoirs, supporting a diverse array of ecological functions and community structures. Lake ecosystems, in particular, exhibit a high degree of species richness and ecological complexity. Ancient …
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Ecology of Lake District ostracoda
… studies of environmental pollution such as eutrophication and surface water acidification. To establish a data-base of ostracod ecology, biannual survey work in 1989-1990 was performed in 75 lakes and tarns of a wide range of physico-chemical characteristics in the Lake District in Cumbria, …
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The dynamics of ¹³C in several New Zealand lakes
… 𝜹¹³C of autochthonous production in 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 …
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Dynamics of internal nutrient loading in a eutrophic, polymictic lake (Lake Rotorua, New Zealand)
Lake Rotorua is a large (80 krn2), polymictic, eutrophic, shalJow (mean depth 10.8 m) lake in central North Island, New Zealand. Blooms of cyanobacteria and occasional anoxia of bottom waters are characteristic of the water quality in the lake during summer months (Dec-Mar.). This study examines …
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Seasonal and spatial patterns in nitrogen cycling and food web interactions in Lake Taupō New Zealand
Lakes with high water quality and low productivity, commonly referred to as ‘oligotrophic’, are often viewed as relatively pristine and highly aesthetic ecosystems, but may still require management of nutrient inputs and fisheries. The ecosystem processes that determine functions in oligotrophic …