Search Constraints

Start Over
Filtering by: Contributor United States. Forest Service. Pacific Southwest Region. Forest Pest Management Remove constraint Contributor: United States. Forest Service. Pacific Southwest Region. Forest Pest Management Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

Search Results

  • Ecological thresholds, climate extremes, and tree species' distributions across the Pacific coastal United States

    Creator:
    Lintz, Heather E.
    Abstract:
    Species' distributions across the landscape are perhaps the least understood yet most conspicuous features of life on earth. Ecologists have long studied species' distributions; yet, many questions remain about why species occur where they do. Such questions persist largely because species' distributions are complex systems with challenging properties like non-linearity,...
    Resource Type:
    Dissertation
    Full Text:
    Extremes, and Tree Species’ Distributions across the Pacific Coastal United States. Abstract

  • 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:
    Service (USDA-FS, including Forest Health Protection and the Pacific Southwest Research Station

  • Fescue taxonomy in the Pacific coast states

    Creator:
    Wilson, Barbara L.
    Abstract:
    Accurate taxonomy is essential to preservation and management of native grasses. Four problems in fescue taxonomy were investigated: the identity of the native fescue that dominates western Oregon and Washington prairies, the relationship of native Festuca roemeri to closely related grasses, the status of F. howellii and F. washingtonica, and...
    Resource Type:
    Dissertation
    Full Text:
    the Pacific Coast States by Barbara L. Wilson A THESIS submitted to Oregon State University in

  • 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:
    Management 2011). Ecological functions of the Pacific Northwest’s forest-dwelling taxa have received much

  • Epidemiological insights into Armillaria mellea root rot in a managed Ponderosa pine forest

    Creator:
    Shaw, Charles G. (Charles Gardner) 1948-
    Abstract:
    Root rot of ponderosa pine caused by Armillaria mellea was studied in a pine forest that had been under management for 30 years in Klickitat County, Washington. Information sources included disease survey, detailed observation and description of specific disease situations, and examination of roots in situ and removed. Roughly circular...
    Resource Type:
    Dissertation
    Full Text:
    root rot in ponderosa pine. Unpublished office report. U. S. Forest Service, Pacific Northwest Forest

  • Yosemite region nitrogen deposition and patterns in the composition of lichen communities

    Creator:
    Hutten, Martin
    Abstract:
    This dissertation describes patterns in epiphytic macrolichen community composition along a nitrogen deposition gradient in the Yosemite region of the Sierra Nevada in California. This region is part of the largest federal air quality Class 1 designated air-shed in the western United States, covering the entire crest of the Sierra...
    Resource Type:
    Dissertation
    Full Text:
    part of the largest federal air quality Class 1 designated air-shed in the western United States

  • Invasion by trees into a grassy bald on Marys Peak, Oregon Coast Range

    Creator:
    Magee, Teresa K.
    Abstract:
    Grassy balds are meadows that occur on or near the summits of montane peaks and ridges. The sites on which balds are located generally fall within the climatic tolerance ranges of associated tree species. This study evaluates the stability of a forest-meadow transition zone of such a bald on Marys...
    Resource Type:
    Masters Thesis
    Full Text:
    stability of a forest-meadow transition zone of such a bald on Marys Peak in the Oregon Coast Range. The

  • Canopy epiphyte studies in the central Oregon Cascades : implications for the management of Douglas-fir forests

    Creator:
    Sillett, Stephen Charles
    Abstract:
    This thesis includes four separate studies. The first two studies assessed edge effects in a 700-year-old forest. After 20 years of exposure, epiphyte assemblages on the clearcut edge were similar to those of the forest interior, but there were some differences in vertical distribution patterns. Several species restricted to the...
    Resource Type:
    Dissertation
    Full Text:
    FOREST MANAGEMENT Knowledge of epiphyte ecology in the Pacific Northwest is growing rapidly as a result

  • Chaparral history, dynamics, and response to disturbance in southwest Oregon : insights from age structure

    Creator:
    Duren, Olivia
    Abstract:
    Fuels management on Bureau of Land Management lands in SW Oregon, USA, is motivated by the needs to reduce fire hazard and restore ecosystems thought to be impacted by fire suppression. Chaparral is one of the most characteristic vegetation communities of SW Oregon's interior valleys, and extensive acreages within this...
    Resource Type:
    Masters Thesis
    Full Text:
    Management, southwest Oregon 9 2. NPMR models used to estimate ages for shrub samples with incomplete

  • 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:
    icarioides fenderi. Journal of Insect Conservation 12:651-661 United States Fish and Wildlife Service