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 “"freshwater snails"”.
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Evaluation of the relationships between watershed-scale land use and contaminants in aquatic environments and the use of freshwater snails as indicators of impairment
The use of manure from animal feeding operations (AFOs) as fertilizer on agricultural land may introduce contaminants to aquatic environments that can negatively affect the health of aquatic organisms. This study utilized a landscape-scale regression-based design to assess the effects of AFOs on …
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Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails
… in aquatic systems was investigated by exposing freshwater snails to dietary or dissolved sources of cadmium. Snails were exposed to control, contaminated food only, contaminated water only, and contaminated food and water treatments. During the 15-day exposure, samples were taken to determine Cd …
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The structural and functional dynamics of selected species -populations of freshwater snails:towards a systems approach
The structural and functional dynamics of freshwater gastropods at Malham Tarn are examined and detailed information is presented with regards to two littoral species, Ancylus fluviatilis (Mull.)and Planorbis contortus(Linn.), occupying a semi-isolated part of the Tarn. At all levels, from whole …
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Environmental fate and effects of atrazine, metolachlor, carbaryl and chlorothalonil in lotic ecosystems
… on dominant grazing invertebrates, common freshwater snails. Physa acuta and Helisoma anceps egestion was lower with individual and combined pesticide exposure likely a result of narcosis and species-specific susceptibility. These data indicate that pesticide fate and abundance are …
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Freshwater snail diversity in relation to Schistosomiasis in the middle Zambezi basin in Lusaka Province
… Zambezi basin in Lusaka province to determine freshwater snail diversity, its relationship to the presence of schistosomiasis and the impact of prevailing environmental factors on snail diversity. The study was carried out during the cool-dry season (July), hot-dry season (October) and hot-wet …
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Theoretical modelling of temperature and rainfall inuence on Schistosoma species population dynamics
… survivability and fecundity rate of both freshwater snails and schistosomes. It was also showed by the nu- merical simulations that all the strategies employed for schistosomiasis control have great e ects both on the population of infected human and infected snail with control strate- …
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Reconstructing Australia’s late Quaternary climate from the geochemistry of lake sediments and snail shells
… on the clumped isotope composition (Δ47) of freshwater snail shells from Blanche Cave, also in south-eastern Australia (Chapter 6). Δ47 analysis allows calculation of the growth temperature of carbonate minerals (e.g. snail shells), independent of organism, carbonate phase, or formation water …