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Filtering by: Subject Fish populations -- Washington (State). Remove constraint Subject: Fish populations -- Washington (State). Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Post-eruption recovery and secondary production of grazing insects in two streams near Mt. St. Helens

    Creator:
    Meyerhoff, Richard Dietrich
    Abstract:
    The eruption of Mt. St. Helens provided the opportunity to study secondary production of grazing insects in the context of disturbance. Two stream sites were chosen that significantly differed in how their watersheds were impacted by the eruption. Clearwater Creek was catastrophically disturbed (physical alteration of habitat, loss of riparian...
    Resource Type:
    Dissertation
    Full Text:
    the volcano in southwest Washington state. In addition ash was spread over a much wider area. For

  • Fish movement and assemblage dynamics in a Pacific Northwest riverscape

    Creator:
    Baxter, Colden V.
    Abstract:
    This study examined fish movements and assemblage dynamics in the Wenaha, Grande Ronde, Snake river system of northeast Oregon and southeast Washington. I investigated the role of fish movement in the dynamics of stream fish assemblages and evaluated relationships between species movement, assemblage structure, and the heterogeneity of habitat at...
    Resource Type:
    Dissertation

  • 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:
    ), and ―endangered‖ by the state of Washington. It is an endangered species in Canada (Seburn and

  • Seasonal floodplain wetlands as fish habitat in Oregon and Washington

    Creator:
    Baker, Cynthia F.
    Abstract:
    To begin to understand freshwater seasonal floodplain fish communities in the context of human alteration of the physical system, species introductions and wetland restoration efforts, I studied fish assemblages in fifteen seasonal floodplain wetlands within four geographic regions (coastal, upper Columbia River estuary, Puget Sound and eastern Oregon/Washington) in the...
    Resource Type:
    Dissertation
    Full Text:
    Washington by Cynthia F. Baker A DISSERTATION submitted to Oregon State University