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Filtering by: Creator Myers, Katherine West Whitney Remove constraint Creator: Myers, Katherine West Whitney Degree Field Zoology Remove constraint Degree Field: Zoology

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  • Seasonal thermoregulation in the dark-eyed junco (Passeriformes: Junco hyemalis)

    Creator:
    Swanson, David Leslie
    Abstract:
    Winters in north-temperate climates impose high thermogenic demands upon small birds which are met by seasonal acclimatization. This thesis investigates the extent and mechanisms of seasonal acclimatization in darkeyed juncos (Junco hyemalis) inhabiting western Oregon. Although insulation is significantly increased in winter, acclimatization is primarily metabolic. Increased metabolism is required...
    Resource Type:
    Dissertation
    Full Text:
    ). Thermogenesis in birds appears to be primarily or exclusively dependent on shivering (West, 1965; Dawson et al

  • 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:
    Risc'on, Lani West, the Ecology group in Zoology at OSU, and particularly Teresa Turner were very helpful

  • Community organization and succession in rocky intertidal surfgrass beds

    Creator:
    Turner, Teresa
    Abstract:
    Succession and organization of rocky intertidal zone surfgrass beds (Phyllospadix scouleri Hook) were examined experimentally at two sites on the Oregon coast. The interaction of three attributes of the plant -- high persistence, high preemption, and slow recovery -- strongly influences the organization of surfgrass beds. Permanent plots indicate that...
    Resource Type:
    Dissertation
    Full Text:
    , G. Van Blaricom, J. Watanabe, L. West, and the Oregon State ecology discussion group. I thank the

  • The maintenance and stability of the shell color polymorphism in the rocky intertidal gastropod Thais (Nucella) emarginata

    Creator:
    Davis, Charles Lee
    Abstract:
    Thais (Nucella) emarginata is a common predatory gastropod of the rocky intertidal system of western North America. It is usually found at low tide on top of its sedentary prey, barnacles and mussels. Thais is also highly polymorphic for shell color, and breeding of isolated females has shown that the...
    Resource Type:
    Dissertation
    Full Text:
    movement rock (MR), in both directions, east and west. Snails continued west (5) face no barrier to further

  • The ecological and behavioral dynamics of breeding in three sympatric anuran amphibians

    Creator:
    Olson, Deanna H.
    Abstract:
    Breeding ecology and behavior were investigated in a field study of three sympatric anuran amphibians in the Oregon Cascade Mountains: the western toad (Bufo boreas), the Cascades frog (Rana cascadae) and the Pacific treefrog (Hyla regilla). A comprehensive study of the western toad mating system was conducted at three populations...
    Resource Type:
    Dissertation
    Full Text:
    females is based (e.g. Whitney and Krebs 1975). Male call characteristics 11 show geographic

  • The effects of community composition, landscape structure, and climate on host-pathogen interactions

    Creator:
    Moore, Sean M.
    Abstract:
    Like other species interactions in ecological systems, host-pathogen interactions are influenced by environmental factors, landscape characteristics and the broader community context. My thesis explores the potential influences of food-web interactions (Chapter 2), climate change (Chapter 3), landscape structure and host movement patterns (Chapter 4), and the combined influences of local...
    Resource Type:
    Dissertation
    Full Text:
    graduate career. Thanks to Katherine Hoffman for logistical support related to the IGERT fellowship. I

  • 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

  • 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:
    (Myers, 1993). Myers (1993) estimated that 50% or more of the species inhabiting earth would be lost

  • 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:
    (Polis and Myers, 1985, Crump, 1992), fish (cichlids, sticklebacks Smith and Reay, 1991; Fitzgerald and

  • The influence of biophysical feedbacks and species interactions on grass invasions and coastal dune morphology in the Pacific Northwest, USA

    Creator:
    Zarnetske, Phoebe Lehmann
    Abstract:
    Biological invasions provide a unique opportunity to study the mechanisms that regulate community composition and ecosystem function. Invasive species that are also ecosystem engineers can substantially alter physical features in an environment, and this can lead to cascading effects on the biological community. Aquatic-terrestrial interface ecosystems are excellent systems to...
    Resource Type:
    Dissertation
    Full Text:
    administration. Katherine Hoffman has been invaluable for helping with logistics related to my IGERT fellowship