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Filtering by: Has journal Journal of Aquatic Animal Health Remove constraint Has journal: Journal of Aquatic Animal Health Academic Affiliation Zoology Remove constraint Academic Affiliation: Zoology Advisor Blaustein, Andrew R. Remove constraint Advisor: Blaustein, Andrew R.

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  • 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
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    quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB negatively

  • An investigation of the alarm response in anuran amphibian larvae

    Creator:
    Hews, Diana K.
    Abstract:
    The results of my research suggest that tadpoles of the Western toad (Bufo boreas) and the Cascades frog (Rana cascadae) display an alarm response to chemicals from injured conspecific tadpoles. Furthermore, results suggest that the Bufo boreas alarm response can be elicited by a natural predator when it feeds on...
    Resource Type:
    Masters Thesis
    Full Text:
    to chemicals released from injured conspecifics occurs in a wide variety of aquatic animals

  • 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:
    widely documented within a diversity of animal groups including amphibians. In this thesis, I offer

  • Ecological aspects of kin discriminating behavior with implications of functional value

    Creator:
    Hokit, D. Grant
    Abstract:
    To assess the context dependence of kin discriminating behavior, I examined kin-biased aggregation behavior in tadpoles of R. cascadae in different ecological conditions. I manipulated food distribution, predator presence, thermal heterogeneity, and relatedness in a multifactorial mesocosm experiment. All four factors interacted to influence tadpole dispersion. My results suggest that...
    Resource Type:
    Dissertation
    Full Text:
    Ecological aspects of kin discriminating behavior with

  • 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
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    context of aquatic communities and food webs. I first focused on how a UVB-exposed natural diet

  • 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:
    health of pathogen-exposed animals. In Chapter 3, I examined a special case of amphibian susceptibility

  • 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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    . Defining and quantifying the effects of stress on animal populations and communities is becoming

  • The effects of pathogens, UV-B radiation, and introduced species on amphibians in the Pacific Northwest

    Creator:
    Kiesecker, Joseph Michael
    Abstract:
    I examined two amphibian communities to assess factors that may impact amphibian biodiversity. The results suggest that the potential factors which influence the maintenance of amphibian biodiversity are multi-faceted and thus, attempts to understand these factors must reflect these complexities. I investigated factors that influenced the susceptibility of western toad...
    Resource Type:
    Dissertation
    Full Text:
    subjected to changes in both aquatic and terrestrial environments. Amphibians are key components of

  • 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
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    Pacific treefrogs and other members of the aquatic community. Nutrient additions caused increased algal

  • 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
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    dwell in warm microhabitats. This raises the temperature of the animal (behavioral fever) and results