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    • Graduate School - MU Theses and Dissertations (MU)
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    • 2008 Dissertations (MU)
    • 2008 MU dissertations - Freely available online
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    A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians

    Williams, Bethany K., 1980-
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    [PDF] research.pdf (1.429Mb)
    Date
    2008
    Format
    Thesis
    Metadata
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    Abstract
    Modification of landscapes for agricultural production can introduce agrochemicals into surface waters and degrade aquatic habitats used by many amphibians for breeding and larval development. Although many ecotoxicological studies have shown that contaminants common in agricultural runoff have the potential to cause mortality, immunosuppression, or reproductive abnormalities in amphibians, we have a very poor understanding of how exposure to agricultural runoff may affect amphibian population persistence when exposures occur in realistic contexts. Using laboratory studies, field studies, and landscape level surveys, I established that herbicides common in runoff can cause mortality and alter life history traits in amphibian larvae under laboratory conditions at levels as low as EPA drinking water standards, although laboratory exposures to water from agricultural streams generally enhanced larval performance. In field enclosure studies, tadpole performance in agricultural streams showed more year-to-year variability than in reference condition streams. Landscape level surveys confirmed that the majority of anurans present in the study area use streams for both calling activity and reproduction. Physical stream habitat characteristics were better predictors of capture rates than local or watershed land use, indicating that habitat availability may be an important constraint on amphibian success at stream sites.
    URI
    https://hdl.handle.net/10355/6641
    https://doi.org/10.32469/10355/6641
    Degree
    Ph. D.
    Thesis Department
    Biological sciences (MU)
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
    Collections
    • 2008 MU dissertations - Freely available online
    • Biological Sciences electronic theses and disserations (MU)

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