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 10 of 10 for “"pesticide contamination"”.
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Assessment of groundwater vulnerability to pesticide contamination in Albemarle and Louisa counties, Virginia
Groundwater contamination potential by pesticide was evaluated in Albemarle and Louisa counties of the Thomas Jefferson Planning District in Virginia. A qualitative method was developed to perform an assessment of pesticide contamination potential, using an existing pesticide screening model. The …
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Is organic beekeeping possible? A multi-year study of pesticide contamination and landscape effects in the Northeast US
… in the U.S. are widely contaminated with pesticides that harm colony health. A potential mitigation strategy is organic management, but formal apiculture standards have not been adopted. Draft guidelines require up to a 6.4 km pesticide-free foraging zone for certified colonies, which is …
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A comparison of runoff- and spray-drift-related pesticide contamination in agricultural surface waters : exposure, effects and mitigation
Runoff and spray-drift-related pesticide input are important sources of non pointsource pesticide pollution in surface waters but few studies have directly compared these routes in a risk assessment scenario. Accordingly a risk assessment approach was instituted to determine differences between …
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A Multi-Scale analysis of organochlorine pesticide contamination in raptor populations: research effort, historical trends, and current concentrations
Pesticide contamination and the associated impacts on biodiversity, have been the focus of intense research and tremendous concern for environmental and conservation scientists over many decades. The environmental consequences of organochlorine pesticides, particularly …
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Assessment of pesticide concentrations in environmental and biological parameters from two Kenyan Rift Valley Lakes
… is also highly susceptible to toxic effects of pesticide contamination...Globally, most organochlorine pesticides have been banned, but endosulfan, HCH and methoxychlor are widely used in Kenya, while aldrin, dieldrin and lindane are restricted and DDT, endrin, and heptachlor banned. Studies …
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Investigating the interactive effects of ultraviolet-B radiation and pesticides in amphibians
… causing factors have been proposed, including pesticide contamination and UVB radiation. However, amphibian declines are likely caused by a combination of these factors. For two of these stressors that co-occur in aquatic habitats, little is known about the interactive effects of pesticides and …
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Factors affecting loggerhead shrike mortality in Virginia
… and organophosphates in all birds analyzed for pesticide contamination. Also, I present statistical models to predict age and sex of loggerhead shrikes; wing chord and tail white on rectrix 5 were the most useful variables in discriminating sexes and wing chord was used in discriminating ages. …
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Effects of Phorate on Ducklings, Macroinvertebrates, and Microtox in Northern Prairie Wetlands
… Microtox readings when evaluating wetlands for pesticide contamination.
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Quantitative risk assessment of pesticides in drinking water under current and future climates
… assessment approaches have become critical for pesticide risk management and mitigation. Despite this, scientists and pesticide regulators have acknowledged the need to improve representation of variability in input data, and uncertainty in pesticide fate processes in existing approaches. …
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The mobility of endosulfan and chlorpyrifos in the soils of the Hex River Valley
… on the area of the Hex River Valley where pesticides have been detected in water samples. The two pesticides, endosulfan and chlorpyrifos, were selected for the study based on their usage and toxicity. As an initial assessment a simple screening model was used to confirm that their …