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Filtering by: Committee Member Olson, Robert Remove constraint Committee Member: Olson, Robert Degree Field Forest Resources Remove constraint Degree Field: Forest Resources

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  • Multi-scale relationships between aspen and birds in the northern Yellowstone ecosystem

    Creator:
    Hollenbeck, Jeff P., 1967-
    Abstract:
    I conducted a multi-scale evaluation of aspen – bird relationships in the northern ungulate winter range of the northern Yellowstone ecosystem during June 2001-03. Questions addressed were: (1) Does bird diversity increase with conifer presence in aspen stands? (2) Given known habitat selection cues, are migrating birds passively intercepted by...
    Resource Type:
    Dissertation
    Full Text:
    , Deanna Olson, and Tom Adams. I gratefully acknowledge the generous logistical support provided by Roy

  • Evidence of a trophic cascade among wolves, elk, and aspen in Yellowstone National Park, USA

    Creator:
    Halofsky, Joshua S.
    Abstract:
    According to general top-down trophic theory, in the presence of carnivores, herbivore behavior and/or densities could change and result in an overall decrease in herbivory on plant communities. In this dissertation, I examined the potential relationship between gray wolf (Canis lupus) presence and absence on elk (Cervus elaphus) herbivory of...
    Resource Type:
    Dissertation
    Full Text:
    advisor Dr. William J. Ripple, and committee members Drs. Robert Anthony, Paul Doescher, Dede Olson, and