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 8 of 8 for “"algal composition"”.
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Effects of grazing by the oligochaete, Aeolosoma, on detrital and periphytic assemblages
… on periphyton assemblages of different algal composition and on unconditioned detritus were examined. Natural water and periphyton inoculum were collected from a littoral environment and used to construct laboratory microcosms. Changes in algal community composition, microbial …
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Cyanobacteria Abundance and Toxin Production in a Drinking Water Supply Reservoir
… from May 23 – September 16, 2011, to determine algal composition, particularly of cyanobacteria, and their corresponding densities over time. The presence and concentration of hepatotoxins were also measured using enzyme-linked immunosorbant assay (ELISA) kits. Over the period of the study, …
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Assessing Thule Inuit impacts on High Arctic lakes and ponds : a paleolimnological approach
… site shows no major changes in geochemistry or algal composition. Previous research on Bathurst Island used water chemistry and surface sediment diatoms to construct a diatom-inferred total nitrogen model for Bathurst Island. However, this study was limited by excluding unbuffered, low pH sites …
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Habitat ecology of the native subtidal snail, Lacuna vincta, in the Gulf of Maine and the impact of two introduced species
… and growth of snails on nine different algal species. The results showed that there were differences in the seasonal abundance patterns of L. vincta populations on different algal species. However, the snail populations in all size classes were found year round on Laminaria saccharina …
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Herbivory by Parma mccullochi (Pomacentridae) : its role as an ecosystem engineer in temperate algal-dominated reefs
… on their diet and their impact on the reef algal community. This study aims to determine the role of Parma mccullochi as an ecosystem engineer on temperate algal-dominated reefs in the metropolitan waters of Perth, Western Australia. To achieve this, the diet of P. mccullochi and any …
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Effects of selected pollutants on grazer utilization of Aufwuchs
… these communities increased as a result of the algal proteinatious sheath. Carbohydrate content was generally less than reference values for Aufwuchs developing under chlorine or copper stress. Aufwuchs from these treated streams were consumed to a less extent than reference communities and …
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The effect of recreational fishing on targeted fishes and trophic structure, in a coral reef marine park
… preferred target of recreational anglers. The algal-grazing urchin Echinometra mathaei comprised 51% of macro invertebrate abundances and was heavily preyed upon by lethrinids, being recorded in 50% of the guts of sampled fish. In nil regions, Sanctuary Zones had a greater biomass of lethrinids …
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Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake
… to enrich aquatic productivity and change algal composition. There has been increased cultural eutrophication of fresh water bodies from increased combustion and atmospheric deposition of nutrients, land development and associated erosion, agricultural fertilizers in runoff, and other …