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Filtering by: Creator Meigs, Andrew J. Remove constraint Creator: Meigs, Andrew J. Academic Affiliation Zoology Remove constraint Academic Affiliation: Zoology Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • The effects of multiple pathogens on amphibians in the Pacific Northwest

    Creator:
    Romansic, John M.
    Abstract:
    The earth is undergoing a “biodiversity crisis” characterized by loss of populations, species, genetic diversity, and ecosystem services. Part of this crisis consists of population declines, extinctions, and increased incidence of deformities in amphibians. It is unknown whether deformities contribute to these declines. Many cases of population declines in amphibians...
    Resource Type:
    Dissertation
    Full Text:
    : ________________________________________________________ Andrew R. Blaustein The earth is undergoing a “biodiversity crisis” characterized by

  • The effects of parasites on host behavior : who benefits?

    Creator:
    Lefcort, Hugh G.
    Abstract:
    Some parasites may modify the behavior of their hosts. Altered behaviors may: 1) benefit the host in that they defend against the pathogen, 2) benefit the pathogen and represent manipulations of the host response, and 3) benefit neither the host or the pathogen and simply be a product of the...
    Resource Type:
    Dissertation
    Full Text:
    approved: Andrew R. Blaustein Some parasites may modify the behavior of their hosts. Altered behaviors

  • Host parasite relationships between deer mice (Peromyscus maniculatus) and their eimerian parasites (protozoa)

    Creator:
    Fuller, Claire A.
    Resource Type:
    Dissertation
    Full Text:
    approved: Andrew R. Blaustein Hosts and their parasites can affect each other's population dynamics

  • Indirect effects of ultraviolet-B radiation on larval amphibians as mediated by food quality and trophic interactions

    Creator:
    Scheessele, Erin A.
    Abstract:
    Ultraviolet-B radiation (UVB) is an abiotic stressor in both terrestrial and aquatic systems. The stratospheric ozone layer, depleted due to anthropogenic activities and the cause of elevated UVB at earth's surface over the last four decades, is predicted to recover by 2065. However, UVB levels in aquatic systems may continue...
    Resource Type:
    Dissertation
    Full Text:
    Food Quality and Trophic Interactions Abstract approved: Andrew R. Blaustein

  • The effects of an emerging pathogen on amphibian host behaviors and interactions

    Creator:
    Han, Barbara A.
    Abstract:
    Contemporary environmental change encompasses massive biodiversity loss and increasing numbers of emerging diseases worldwide. As part of a global biodiversity crisis, amphibians are disappearing at unprecedented rates. Batrachochytrium dendrobatidis is an emerging infectious pathogen prominently associated with many declines. Chapter 1 reviews the past decade of research on this system...
    Resource Type:
    Dissertation
    Full Text:
    . Abstract approved: Andrew R. Blaustein Contemporary environmental change encompasses massive

  • All hosts are not created equal : variation in amphibian responses to an emerging fungal pathogen and why it matters

    Creator:
    Gervasi, Stephanie S.
    Abstract:
    Emerging infectious diseases are increasing globally and are a threat to human, wildlife, and ecosystem health. The emerging fungal pathogen, Batrachochytrium dendrobatidis (Bd), or amphibian chytrid fungus, is associated with worldwide amphibian population declines and extinctions. Bd has been found on every continent where amphibians exist and has been documented...
    Resource Type:
    Dissertation
    Full Text:
    Responses to an Emerging Fungal Pathogen and Why it Matters Abstract approved: Andrew R. Blaustein

  • Ultraviolet radiation as an environmental stressor of amphibians

    Creator:
    Bancroft, Betsy A.
    Abstract:
    My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB...
    Resource Type:
    Dissertation
    Full Text:
    , Nick J. Baker, and Andrew R. Blaustein Ecology Letters

  • Multiple stressors and amphibian population declines

    Creator:
    Hatch, Audrey C.
    Abstract:
    In the past decade, declines in amphibian populations have captured scientific and popular interest. The causes of the declines are likely to be complex and involve interactions between several environmental stressors. Using multifactorial experiments, I investigated the combined effects of several anthropogenic stressors on developing amphibians in Oregon, USA. In...
    Resource Type:
    Dissertation
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    ACKNOWLEDGEMENTS My major professor, Dr. Andrew R. Blaustein, has been exceptionally supportive personally and

  • Environmental influences on host-pathogen dynamics of the amphibian chytrid fungus

    Creator:
    Buck, Julia C.
    Abstract:
    The causes of the global biodiversity crisis are varied and complex. Anthropogenic threats may act in isolation, or interact additively or synergistically with each other or with natural stressors to affect sensitive taxa. The recent emergence of many infectious diseases in wildlife has brought attention to the role of disease...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Andrew R. Blaustein The causes of the global biodiversity crisis are varied and complex

  • Cannibalism in larvae of the long-toed salamander, Ambystoma macrodactylum

    Creator:
    Wildy, Erica Lynn
    Abstract:
    Predator-prey interactions have historically been studied to explain patterns of organization observed in populations and communities. They have also been important in understanding the evolution of antipredator responses in prey and counterstrategies in predators. Despite the breadth of knowledge that exists for heterospecific interactions, relatively few studies have investigated the...
    Resource Type:
    Dissertation
    Full Text:
    macrodactijiurn. Absfract approved: Andrew R. Blaustein Predator-prey interactions have historically been