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Filtering by: Creator Miller, Steven Remove constraint Creator: Miller, Steven Decade 2000-2009 Remove constraint Decade: 2000-2009 Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Reproductive isolation and interspecific hybridization in the threatened species, Sidalcea nelsoniana

    Creator:
    Gisler, Steven D.
    Abstract:
    In addition to its longstanding recognition as an influential evolutionary process, interspecific hybridization is increasingly regarded as a potential threat to the genetic integrity and survival of rare plant species, manifested through gamete wasting, increased pest and disease pressures, outbreeding depression, competitive exclusion, and genetic assimilation. Alternatively, hybridization has also...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Steven D. Gisler for the

  • New perspectives on evolutionary relationships within Pinus (Pinaceae) and within subsection Ponderosae (subgenus Pinus)

    Creator:
    Willyard, Ann Nachreiner
    Abstract:
    A fossil-calibrated phylogenetic framework based on exemplars from each of the four taxonomic sections within Pinus was created using multiple nuclear and chloroplast loci. Calibration at the well-defined subgeneric split within Pinus with either fossil leaves and cones (ca. 45 million years ago) or fossil wood (ca. 85 million years...
    Resource Type:
    Dissertation
    Full Text:
    advisers Richard Cronn and Aaron Liston, and to my committee, Steven Strauss, Joseph Spatafora, and Paul

  • Biology of sweet cherry powdery mildew

    Creator:
    Calabro, Jill M.
    Abstract:
    The Pacific Northwest has become one of the nation’s premier sweet cherry, Prunus avium, production areas. As production of sweet cherries has flourished in Oregon and Washington, so has powdery mildew, caused by the fungus Podosphaera clandestina, which infects both foliage and fruit causing severe economic damage to growers. Sweet...
    Resource Type:
    Dissertation
    Full Text:
    demethylation inhibiting (DMI) fungicides (Savocchia et al. 2004;Miller and Gubler 2004). Studies of grape

  • Yield responses of invasive grasses to carbon doses

    Creator:
    Brunson, Jessi L.
    Abstract:
    The sagebrush steppe ecosystem of the northern Great Basin is severely degraded and continues to decline due in large part to the invasive, non-native annual grasses Bromus tectorum L. (cheatgrass) and Taeniatherum caput-medusae (L.) Nevski (medusahead). Restoration of invasive-dominated areas is difficult, but can be enhanced by adding a carbon...
    Resource Type:
    Masters Thesis
    Full Text:
    et al. 1999; Miller et al. 1999; Mosley et al. 1999). Furthermore, conversion of Artemisia

  • The effects of defoliation on Bromus tectorum seed production and growth

    Creator:
    Mayer, Kara Hempy
    Abstract:
    Cheatgrass (Bromus tectorum L.) is a widespread exotic weed in the Intermountain sagebrush steppe. An annual grass, it is highly prolific and very competitive with native perennial grass seedlings. A clipping experiment carried out at two cheatgrass-dominated sites (Lincoln Bench and Succor Creek) in eastern Oregon analyzed effects of defoliation...
    Resource Type:
    Masters Thesis
    Full Text:
    Lab," including Kristen Harrison, Steven Bekedam, Scott Schaff, Nicole DeCrappeo, Cindy Salo in

  • Willamette Valley Prairie Restoration : The Native Seed Network and Sidalcea

    Creator:
    Lambert, Joshua K.
    Abstract:
    My internship was conducted with the Native Seed Network program within the Institute for Applied Ecology, a non-profit organization located in Corvallis, whose focus is education, applied research and active restoration and of native ecosystems. My internship goals were to increase my experience in applied restoration ecology and conservation biology...
    Resource Type:
    Capstone Project

  • The influence of prescribed fire on the rare endemic plant Delphinium pavonaceum (Peacock larkspur)

    Creator:
    McKernan, Brie-Anne
    Abstract:
    In the wetland prairie of William L. Finley National Wildlife Refuge (FNWR) in western Oregon, we investigated the response of Delphinium pavonaceum Ewan (peacock larkspur, Ranunculaceae), an endangered perennial forb, to four unreplicated dormant season fire regimes of 0, 2, 4, or 10 fires that were applied over a 12-year...
    Resource Type:
    Masters Thesis
    Full Text:
    Theiss, and volunteers Tony Stout, Will Sheppy, Rebecca Currin, and Todd Miller provided invaluable

  • Litter decay processes and soil nitrogen availability in native and cheatgrass-dominated arid rangelands

    Creator:
    Harrison, Kristen S.
    Abstract:
    As large-scale restorations of degraded rangelands are initiated, land managers need to understand how decades of dominance by the invasive annual grass, cheatgrass (Bromus tectorum L.), have altered ecosystem processes. One way to assess such alterations is by observing differences in decay rates, since decomposition is determined by factors such...
    Resource Type:
    Masters Thesis
    Full Text:
    many people who helped in the field and the lab, including Nicole DeCrappeo, Scott Shaff, Steven

  • Phylogenetics and genomic patterns of speciation in Pinus with an empahsis on subgenus Strobus

    Creator:
    Syring, John V.
    Abstract:
    Data from nuclear ribosomal internal transcribed spacer regions (nrITS) and chloroplast DNA (cpDNA) have failed to resolve phylogenetic relationships in Pinus. To provide greater interspecific resolution, five low-copy nuclear genes were developed from mapped conifer anchor loci. Four genes were sequenced from species representing all Pinus subsections. Individual loci do...
    Resource Type:
    Dissertation
    Full Text:
    years ago (Miller, 1973; Meijer, 2000; Magallon and Sanderson, 2002; Willyard et al., in review

  • Conservation genetics of Kincaid's lupine : a threatened plant of western Oregon and southwest Washington grasslands

    Creator:
    Severns, Paul M.
    Abstract:
    Kincaid's lupine (Lupinus oreganus Heller) is a federally listed threatened species native to remnant grassland of western Oregon and southwestern Washington, and is the primary larval host plant of a once thought extinct butterfly, Plebejus icarioides fenderi Macy. Past studies concerning Kincaid's lupine reproduction suggested that populations may suffer reductions...
    Resource Type:
    Dissertation
    Full Text:
    , Dominic Maze, Wes Messinger, Steven Meyers, Nate Miller, John Pelham, Harold Rice, Andy Warren) for