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  • Conservation biology of Plagiobothrys hirtus (Boraginaceae) : evaluation of life history and population enhancement

    Creator:
    Amsberry, Kelly
    Abstract:
    Plagiobothrys hirtus (Boraginaceae) is a state and federally listed endangered plant found only in Douglas County, Oregon. This vernal pool endemic has historically been threatened by agricultural conversion of seasonal wetlands in the Sutherlin area, and is currently being eradicated as habitat is lost due to the rapid urban development...
    Resource Type:
    Masters Thesis
    Full Text:
    enhancement study sites in 19 Douglas County, Oregon. 3. Plants in the greenhouse ready for transplanting. 23

  • Reproduction, demography, and habitat characterization of Astragalus peckii (Fabaceae), a rare central Oregon endemic

    Creator:
    Martin, Elizabeth F.
    Abstract:
    With little previous research on Astragalus peckii (Fabaceae), a state-listed Threatened species in Oregon, I investigated three facets of its biology which are integral to the conservation and management of the species. First, a four-year demographic study of two large populations revealed increasing population growth at one site (Chiloquin) and...
    Resource Type:
    Dissertation
    Full Text:
    submitted to Oregon State University in partial fulfillment of the requirements for

  • Cryptogam communities in forest and steppe ecosystems of Oregon, USA

    Creator:
    Root, Heather T.
    Abstract:
    I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for...
    Resource Type:
    Dissertation
    Full Text:
    presented on June 9, 2011. Title: Cryptogam Communities in Forest and Steppe Ecosystems of Oregon, USA

  • The epidemiology of sudden oak death in Oregon forests

    Creator:
    Peterson, Ebba K.
    Abstract:
    The phytopathogen Phytophthora ramorum (Werres, DeCock & Man in't Veld), causal agent of Sudden Oak Death (SOD) of oaks (Quercus spp.) and tanoaks (Notholithocarpus densiflorus syn. Lithocarpus densiflorus), is established in coastal forests of the western United States. Since the discovery of SOD in the Douglas-fir / tanoak forests of...
    Resource Type:
    Dissertation
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree of

  • Relationships of exotic species and wildfire to the threatened plant Silene spaldingii

    Creator:
    Menke, Carolyn A.
    Abstract:
    In the canyon grasslands of Garden Creek Ranch Preserve in Idaho, where the threatened plant Silene spaldingii occurs and invasion by the exotic species Centaurea solstitialis and Bromus tectorum is proceeding rapidly, I examined environmental and community patterns of site invasion, and evaluated the apparent influence of invasion on Silene...
    Resource Type:
    Masters Thesis
    Full Text:
    , Reconnaissance Soil Survey for Nez Perce County, ID, 1976). Soils are typically shallow and rocky along ridges

  • Development and Application of Tools for Genetic Analysis of Clonal Populations

    Creator:
    Kamvar, Zhian N.
    Abstract:
    Research on the population genetics of microbial organisms requires the use of specialized analyses designed for clonal organisms to avoid violating the assumptions of traditional population genetic models. The tools necessary for performing these analyses existed as a set of unrelated software with non-overlapping capabilities and did not cover all...
    Resource Type:
    Dissertation
    Full Text:
    pathogen, Phytophthora ramorum in Curry County, Oregon. In chapter 5, we use poppr to assess the power

  • Epidemic Dynamics of Sudden Oak Death in the Forests of Oregon

    Creator:
    Carson, Adam
    Abstract:
    Sudden Oak Death (SOD) is a forest disease caused by the oomycete pathogen Phytophthora ramorum, and infects trees in the Western United States and Europe. This generalist pathogen can infect over 130 species of plants, and causes rapid mortality in tree species in the Fagaceae. Sexual reproduction is thought to...
    Resource Type:
    Masters Thesis
    Full Text:
    shifted to one of slowing the spread of the disease. Current treatment for SOD in Oregon involves

  • Phytophthora ramorum within an Oregon tanoak forest : quantifying inoculum within canopy throughfall vs. soil splash

    Creator:
    Benemann, Silvia, E.
    Abstract:
    Phytophthora ramorum continues to cause extensive mortality of tanoaks in southwestern Oregon. Rain readily washes inoculum down through the canopy, causing new infections on the lower parts of the tree and neighboring host plants. Although this aspect of dispersal is well understood, the relative importance of infested soil and leaf...
    Resource Type:
    Masters Thesis
    Full Text:
    baiting with whole rhododendron leaf baits. In the Oregon tanoak forest studied, quantification of

  • Characteristics of soil organic matter in two forest soils

    Creator:
    Crow, Susan E.
    Abstract:
    Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. Soil organic matter composition typically can be traced directly back to the type of detrital inputs; however, the stabilization of SOM results as a combination of chemical...
    Resource Type:
    Dissertation
    Full Text:
    ) for primary inputs to the forest floor and mineral soil at eachstudy site

  • Conservation of Oenothera wolfii (Onagraceae) : introducing a threatened plant into two protected locations in Oregon

    Creator:
    Currin, Rebecca E.
    Abstract:
    The showy biennial to short-lived perennial Oenothera wolfii (Munz) Raven, Dietrich & Stubbe (Wolf’s evening primrose) occurs in only a small number of isolated populations on the southern Oregon and northern California coast. This rare species is currently listed as Threatened in Oregon, and is considered a Species of Concern...
    Resource Type:
    Masters Thesis
    Full Text:
    OF THE THESIS OF Rebecca E. Currin for the degree of Master of Science in Botany and Plant