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Filtering by: Creator Cowlitz Valley Ranger District (Agency : Wash.) Remove constraint Creator: Cowlitz Valley Ranger District (Agency : Wash.) Degree Level Doctoral Remove constraint Degree Level: Doctoral Rights Statement Copyright Not Evaluated Remove constraint Rights Statement: Copyright Not Evaluated

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  • Land use distributions and changes in the Willamette Valley in relation to soil characteristics

    Creator:
    Wiens, John Herbert
    Abstract:
    A study was undertaken in the Willamette Valley, Oregon, to document 1971 land use patterns as well as land use change in a smaller study area in the 16 years prior, and to relate these to soil characteristics. Quantification of these inter-relationships was aided by use of computer tabulation and...
    Resource Type:
    Dissertation
    Full Text:
    Valley in relation to soil characteristics AN ABSTRACT OF THE THESIS OF JOHN HERBERT WIENS for the

  • Cumulative effects of land use on salmon habitat in southwest Oregon coastal streams

    Creator:
    Frissell, Christopher Andrew, 1960-
    Abstract:
    As part of a hierarchical approach to classifying watersheds and stream habitats based on geomorphic and geologic criteria, we defined ten classes of fluvial and lacustrine habitats at the scale of valley segments. Valley segments are landscape units which encompass surface waters and the adjacent floodplains and hillslopes with which...
    Resource Type:
    Dissertation
    Full Text:
    habitats at the scale of valley segments. Valley segments are landscape units which encompass surface

  • Colombia's national parks : an analysis of management problems and perceived values

    Creator:
    Meganck, Richard Albert
    Abstract:
    This analysis of Colombia's System of National Park Reservations accomplishes four objectives: 1) The historical development of national parks in Colombia was described; 2) The status, as of August, 1974, of the areas administered by the Colombian Renewable Natural Resources Development Institute (INDERENA) was summarized; 3) An analysis of major...
    Resource Type:
    Dissertation
    Full Text:
    government agency, the Autonomous Corporation of the Cauca Valley (CVC - Corporacion Autonoma de Valle de

  • A critical analysis of wildlife conservation in Oregon

    Creator:
    Rymon, Larry Maring
    Abstract:
    This analysis is the study of Oregon's wildlife resources from the period prior to white settlement up to the present time, including critical projections, based on present trends and expected conditions for both human and wildlife populations in the state up to the year 2010. Prior to white settlement Oregon...
    Resource Type:
    Dissertation
    Full Text:
    balanced ecosystem. The fertile, moist valley regions were areas where an abundance of wildlife was found

  • Contextual systems description of an Oregon coastal watershed

    Creator:
    Goetze, Brigitte
    Abstract:
    Many resource management controversies indicate disagreement about the possible intended and unintended effects of management actions on ecosystems. Researchers have documented a variety of negative effects on specific ecosystems, e. g. the degradation of salmonid habitat due to mass wasting (Hagans et al. 1986). While the effects of some management...
    Resource Type:
    Dissertation
    Full Text:
    Wildlife refuge in the the San Joaquin valley, California. Water of this wetland contains toxic amounts of

  • A biosystematic study in the genus Aster, section Aster, in western North America

    Creator:
    Dean, Milton Lee
    Abstract:
    A biosystematic investigation was undertaken in 15 species and three subspecies of the genus Aster, in western North America. Previous studies had been based entirely on external morphological features, and it was believed that much could be learned about the natural affinities of the taxa by exploring their cytological and...
    Resource Type:
    Dissertation
    Full Text:
    side of Lost Lake. 335 Idaho: Valley Co., So. Fk. Salmon R., ca.13 mi. N of Knox. 354a Oregon

  • An economic evaluation of Columbia River anadromous fish programs

    Creator:
    Richards, Jack Arthur
    Abstract:
    It is important to avoid misallocation of resources for either private or public production. Misallocation in public programs can result from failure to employ resources in h:igh priority uses or to eliminate programs that have become obsolete. This study evaluates the benefits and costs of the continuing public program aimed...
    Resource Type:
    Dissertation
    Full Text:
    agency, and annual opera- tion, maintenance, and water value from 1962 to 1966 for Columbia River

  • An economic analysis of policies, cost and returns for public and commercial campgrounds on the Oregon coast

    Creator:
    Reiling, Stephen D.
    Resource Type:
    Dissertation
    Full Text:
    . 77 10 Operation and maintenance costs for the campgrounds in the Mapleton Ranger District. 77 11

  • Factors affecting the abundance of fall chinook salmon in the Columbia River

    Creator:
    Van Hyning, Jack M.
    Abstract:
    A study of the population ecology of Columbia River fall chinook salmon, Oncorhynchus tshawytscha (Walbaum), was made in an attempt to determine the cause of a serious decline in this run which occurred in the early 1950's. Fluctuations in abundance of major salmon runs the North Pacific were examined to...
    Resource Type:
    Dissertation
    Full Text:
    (Pacific Salmon Inter -Agency Council, PSIAC, 1966). Rather violent fluctuations exist but, except for

  • Taxonomy and evolution of the Orthotyline genus Lopidea (Heteroptera: miridae)

    Creator:
    Asquith, Adam
    Abstract:
    The genus Lopidea Uhler is revised for America north of Mexico. The relationship of Lopidea to other orthotyline genera is discussed and it is proposed that the genus Ilnacora Reuter is the sister group of Lopidea. Forty-eight species of Lopidea are recognized in North America, one of which is described...
    Resource Type:
    Dissertation
    Full Text:
    , Seattle, Wash.; W.M. Giffard, 7-VII-17; (CAS). Lopidea angustata Knight: M, Antioch Calif., Sand Dunes