Search Constraints

Start Over
Filtering by: Creator Grant, Gordon Remove constraint Creator: Grant, Gordon Committee Member Menge, Bruce Remove constraint Committee Member: Menge, Bruce Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

Search Results

  • 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:
    implications of functional value AN ABSTRACT OF THE THESIS OF D. Grant Hokit for the degree of Doctor of

  • 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:
    Blaustein, Bruce Menge, Joseph Beatty, Dede Olson, Gordon Reeves, and Douglas Derryberry. During my

  • Inner-shelf circulation off the central Oregon Coast

    Creator:
    Kirincich, Anthony R.
    Abstract:
    Inner-shelf circulation and mechanisms of across-shelf transport of water masses were examined using seven years of observations collected by the Partnership for Interdisciplinary Studies of Coastal Oceans (PISCO) program, a long-term monitoring effort along the central Oregon coast. Since 1998, moored velocity and hydrographic measurements have been obtained during the...
    Resource Type:
    Dissertation
    Full Text:
    primarily by the Gordon and Betty Moore Foundation and David and Lucile Packard Foundation. Bruce Menge

  • Infectious diseases of the Felidae : parasite communities from miniature to massive

    Creator:
    Broughton, Heather M.
    Abstract:
    Direct anthropogenic stressors have caused drastic declines in wildlife populations over the past two centuries. In the face of these threats, spillover of infectious disease from domestic animals and livestock into wildlife, and novel interactions between parasites and pathogens within wildlife communities, have further suppressed already vulnerable populations. As management...
    Resource Type:
    Dissertation
    Full Text:
    , Ajubatus, and Morris Animal Foundation (Grant # D13ZO-420). On the miniature side of the feline

  • 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:
    findings are discussed in the next chapter. Grant-Petersson and Renwick (1996) fed larvae of two

  • Formation and maintenance of fish assemblages in a high desert Oregon stream

    Creator:
    Pearsons, Todd N.
    Abstract:
    Considerable controversy exists about how fish assemblages are organized. I explicitly took fish movement into account while I studied the effects of disturbance, habitat complexity, and predation at different times of the summer to understand the major factors influencing assemblage structure in a high desert Oregon stream. The effects of...
    Resource Type:
    Dissertation
    Full Text:
    reviewed chapter 3. This research was supported by Oregon Department of Fish and Wildlife grant (F-147

  • 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
    Full Text:
    supportive dissertation committee, including Bruce Menge, Doug Robinson, Gordon Grant, Judith Li, Joe

  • Population and production ecology of Lipsothrix spp. (Diptera:Tipulidae)

    Creator:
    Dudley, Thomas L.
    Abstract:
    Craneflies of the genus Lipsothrix inhabit decomposing wood in streams. The life cycles and ecological relationships of L. nigrilinea (Doane) and L. fenderi Alexander were investigated to determine how they exploit and respond to the wood habitat and their role in degradation of woody debris in western Oregon. Surveys of...
    Resource Type:
    Masters Thesis
    Full Text:
    encouragement of Ken Cummins. Gordon Pritchard and George Byers gave me sage advice from afar. The members of