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Filtering by: Funding statement This research was supported by the NASA Terrestrial Ecology Program (NNX09AL51G). Remove constraint Funding statement: This research was supported by the NASA Terrestrial Ecology Program (NNX09AL51G). Degree Name Master of Science (M.S.) Remove constraint Degree Name: Master of Science (M.S.)

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  • Extensive Resource Subsidies by Salmon-Supported Bears to Granivores

    Creator:
    Shakeri, Yasaman N.
    Abstract:
    In salmon-rich, northern coastal environments brown bears can occur at high densities and exert wide-ranging effects on ecosystem processes. Bear consumption of seasonally available fruit may provide important seed dispersal services to plants, and by extension, influence the ecology of seed consumers such as small mammals. In this study, we...
    Resource Type:
    Masters Thesis
    Full Text:
    which diplochory, two-phase seed dispersal, may influence the community ecology of this system. We

  • Landscape occupancy by free ranging cattle in northeast Oregon

    Creator:
    Wilson, Kerry D.
    Abstract:
    Global Positioning System (GPS) and Geographic Information System (GIS) technologies were employed to evaluate cattle occupancy of three landscape attributes on three different grazing allotments administered by the Wallowa Whitman National Forest in Northeast Oregon. Topographic characteristics of slope; 0-4%, 4-12%, 12-35% and >35% were evaluated as well as north...
    Resource Type:
    Masters Thesis
    Full Text:
    on the research question asked. It was recognized by Ganskopp (2001) that frequency of

  • Diversity and community structure of aquatic insects in isolated montane desert streams

    Creator:
    Bogan, Michael T.
    Abstract:
    Local aquatic insect diversity and community structure is the result of multiple local and regional factors, and observed patterns depend upon the spatial and temporal scale under examination. Isolated stream systems in arid regions represent a new challenge in understanding the drivers of diversity and community structure, as most studies...
    Resource Type:
    Masters Thesis
    Full Text:
    the brief high flow season. This seasonal abiotic shift allows the 'time-sharing' of MSI streams by

  • The conversion of allochthonous material by stream detritivores

    Creator:
    Grafius, Edward John
    Abstract:
    The role of detritivores in the conversion of allochthonous leaf material in two small streams in the Cascade Range of Oregon was studied. Their importance in relation to other consumers was estimated from emergence and benthic standing crop data. Ingestion rates and efficiencies of utilization of bigleaf maple (Acer macrophyllum)...
    Resource Type:
    Masters Thesis
    Full Text:
    by the NSF International Biological Program and a major portion of the research was conducted while

  • On the Edge : Assessing Fish Habitat Use Across the Boundary between Pacific Oyster Aquaculture and Eelgrass in Willapa Bay, WA

    Creator:
    Muething, Kelly A.
    Abstract:
    Estuaries are an important ecological link between terrestrial, freshwater, and marine systems, but are also subject to a variety of human pressures. Along the West Coast of the United States, shellfish aquaculture is one extensive use of estuarine tidelands. Specifically, Pacific oyster (Crassostrea gigas) aquaculture has been practiced for almost...
    Resource Type:
    Masters Thesis
    Full Text:
    aquaculture was less than both the long-line aquaculture and eelgrass beds. This is consistent with an

  • Reviving Whychus Creek: Averting Collisions between the Endangered Species Act and Agricultural Water Use through Proactive Streamflow Restoration

    Creator:
    Dengel, Jeff
    Abstract:
    In the wake of policies catalyzing settlement through agrarian-based land ‘improvement’, private property rights absorbed water resources through Western water law. Consequently, these dominant user regimes and the doctrine of prior appropriation allocated nearly 80 percent of freshwater resources to agricultural use. Following enactment of the Endangered Species Act (ESA)...
    Resource Type:
    Capstone Project
    Full Text:
    to fulfill this program in a meaningful manner. Your faith in your students permeates the culture

  • Grazing Effects on Fuels and Plant Community Characteristics across Three Community Types in Wyoming Big Sagebrush Steppe

    Creator:
    Thomas, Tyler W.
    Abstract:
    Livestock grazing is the prominent land use in Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis [Beetle & A. Young] S.L. Welsh) steppe and has been present since the late 1800’s. There have been calls to remove livestock grazing from rangelands as historic grazing practices resulted in the degradation of some...
    Resource Type:
    Masters Thesis
    Full Text:
    the course of this program. Their support has pushed me to further my education and helped me figure

  • Distribution and behavior of cattle grazing riparian pastures

    Creator:
    Wilson, Marie A. (Marie Annette)
    Abstract:
    One second GPS collars were deployed on cattle in three different pastures at three separate times during the year. In each riparian pasture the vegetative communities and stream bank edge were digitally mapped using low elevation aerial photographs and checked in the field for accuracy. A 5 m buffer zone...
    Resource Type:
    Masters Thesis
    Full Text:
    review of this subject by the National Research Council (2002) indicated that: “Traditional

  • Ecology of Craterellus tubaeformis in western Oregon

    Creator:
    Trappe, Matthew James
    Abstract:
    Craterellus tubaeformis is a small to medium-sized forest mushroom that is fairly common in the Douglas-fir/western hemlock forests of the Pacific Northwestern United States and is most often associated with decayed coarse woody debris. In this study, the mycorrhizae of Craterellus tubaeformis in western Oregon is identified by DNA analysis...
    Resource Type:
    Masters Thesis
    Full Text:
    unknown. This research will not address all of the unknown aspects of Craterellus tubaeformis ecology

  • Influence of nitrogen and phosphorus on interference between medusahead and squirreltail

    Creator:
    Young, Kert R.
    Abstract:
    Restoration of invaded aridlands is required to reduce the exorbitant ecological and monetary losses related to noxious weeds. An understanding of how reduced and increased levels of soil N and P influence interference between medusahead and squirreltail is imperative to understanding how squirreltail may be used in restoration of medusahead...
    Resource Type:
    Masters Thesis
    Full Text:
    This study was conducted in a greenhouse at the Eastern Oregon Agricultural Research Center in Burns