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Filtering by: Creator Yamamuro, Asako Melody Remove constraint Creator: Yamamuro, Asako Melody Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Adaptive diversity and divergence at frog antimicrobial peptide loci

    Creator:
    Tennessen, Jacob A.
    Abstract:
    In this dissertation I study evolutionary patterns at genes encoding antimicrobial peptides (AMPs) in frogs. AMPs are short, amphipathic, cationic, secreted proteins that kill bacteria and other pathogens through a non-catalytic mechanism that involves binding to and disrupting the microbial cell membrane. In many animal taxa, positive selection is much...
    Resource Type:
    Dissertation
    Full Text:
    Asako Yamamuro. Finally, I am eternally indebted to my family. My fiancée Monica Jacobson has been

  • Aquatic community responses to drought disturbance: experimental manipulations of top predator extinctions and stream drying

    Creator:
    Boersma, Kate S.
    Abstract:
    Although it is generally assumed that the intensifying abiotic environment is the primary effect of drought on aquatic organisms, drought-induced top predator extinctions may be an important underlying mechanism. I used manipulative experiments to disentangle the impacts of drying and top predator extinctions on arid-land aquatic invertebrate communities. I then...
    Resource Type:
    Dissertation
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    Phillipsen, Tiffany Schriever, Daniel Trovillion, Rich Van Driesche, and Asako Yamamuro for accompanying me

  • Aquatic insect adaptations to different flow regimes

    Creator:
    Yamamuro, Asako Melody
    Abstract:
    My thesis explored the effects of environmental variability on population dynamics and community composition of aquatic insects. Environmental variability in the form of flow regime in streams can limit the distribution and life-history traits of aquatic insects. I used tributaries to the McKenzie River in Oregon with dramatically different flow...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Asako M. Yamamuro for the degree of Doctor of Philosophy in Zoology presented on December

  • Drought, dispersal, and community dynamics in arid-land streams

    Creator:
    Bogan, Michael T.
    Abstract:
    Understanding the mechanisms that regulate local species diversity and community structure is a perennial goal of ecology. Local community structure can be viewed as the result of numerous local and regional processes; these processes act as filters that reduce the regional species pool down to the observed local community. In...
    Resource Type:
    Dissertation
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    , including Asako Yamamuro, Deb Finn, Emily Hartfield, Ivan Phillipsen, Kate Boersma, and Laura McMullen

  • Ecological responses to riverine floods and flow alteration

    Creator:
    McMullen, Laura E.
    Abstract:
    Floods are major disturbance events for riverine ecosystems, directly and indirectly impacting organisms and their habitat. In this study I investigated the role of riverine floods and flow alteration in regulating aquatic macroinvertebrate population and community structure. I examined this problem using a variety of methods: a meta-analytic review of...
    Resource Type:
    Dissertation
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    Pelegrin, Ivan Phillipsen, and Asako Yamamuro. Many undergraduates and post-bacs provided hours of

  • Host-pathogen dynamics in a changing environment : susceptibility of amphibians to an emerging infectious disease

    Creator:
    Searle, Catherine L.
    Abstract:
    Infectious diseases are a growing concern for both humans and wildlife. The negative effects of infectious disease have been exemplified by the recent global amphibian population declines associated with disease outbreaks. Although multiple pathogens and factors play a role in these declines, the aquatic fungal pathogen, Batrachochytrium dendrobatidis (Bd), has...
    Resource Type:
    Dissertation
    Full Text:
    , Orissa Moulton, Melanie Marine, Tim Pusack, Luis Vinueza, Jeremy Rose, Heidi Rose, Asako Yamamuro, and

  • On the evolution of correlated color traits in garter snakes

    Creator:
    Westphal, Michael F.
    Abstract:
    How complex traits evolve continues to be a major focus of evolutionary investigation. A current topic of debate is the hypothesis that the phenotypic integration of complex traits gives rise to evolutionary constraints. I studied two color traits in the common garter snake, Thamnophis sirtalis, that show a high level...
    Resource Type:
    Dissertation
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    , Andrew Chang, Mark Albins, Laura McMullen, Asako Yamamuro, Christine Schnitzler, Dr. Betsy Bancroft, Dr

  • Population genetics of ranid frogs : investigating effective population size and gene flow

    Creator:
    Phillipsen, Ivan C.
    Abstract:
    This dissertation focuses on the evolutionary forces of genetic drift and gene flow in frog populations. The balance of these two forces and the force of mutation largely determine the amount of neutral genetic variation within populations as well as the degree of genetic similarity among populations. The stochastic evolutionary...
    Resource Type:
    Dissertation
    Full Text:
    Wood-Charleson, Asako Yamamuro, and Phoebe Zarnetske. Outside of the Zoology Department, there are

  • The role of oxygen and other environmental variables on survivorship, abundance, and community structure of invertebrate meroplankton of Oregon nearshore coastal waters

    Creator:
    Eerkes-Medrano, Dafne I.
    Abstract:
    The high productivity of Eastern Boundary Upwelling Ecosystems (EBUE), some of the most productive ecosystems in the globe, is attributed to the nutrient rich waters brought up through upwelling. Climate change scenarios for coastal upwelling systems, predict an intensification of coastal upwelling winds. Associated with intensification in upwelling are biogeochemical...
    Resource Type:
    Dissertation
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    weekends and many nights to count larvae. Jennifer Olson, Asako Yamamuro, Satoshi Kimura, Jeremy