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Filtering by: Creator Conroy, Kendall J. Remove constraint Creator: Conroy, Kendall J. Advisor Liss, William J. Remove constraint Advisor: Liss, William J.

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  • Anthropogenic activities associated with the status of salmon stocks in Pacific Northwest watersheds

    Creator:
    Mrakovcich, Karina Lorenz
    Abstract:
    Stocks of salmon are declining in the Pacific Northwest. Based on region-wide studies that list and categorize the status of salmon stocks (Nehlsen et al., 1991; Huntington et al., 1994; and Nawa, 1995), I analyze the watersheds where stocks of salmon spawn for several anthropogenic variables, most of which are...
    Resource Type:
    Dissertation

  • Distribution of nearshore macroinvertebrates in lakes of the northern Cascade Mountains, Washington, USA

    Creator:
    Hoffman, Robert L.
    Abstract:
    Although nearshore macroinvertebrates are integral members of high mountain lentic systems, knowledge of ecological factors influencing their distributions is limited. Factors affecting distributions of nearshore macroinvertebrates were investigated, including microhabitat use and vertebrate predation, in the oligotrophic lakes of North Cascades National Park Service Complex, Washington, USA, and the conformity...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: Wi am J. Liss Although nearshore macroinvertebrates are integral members of high

  • Colonization and development of macroinvertebrate communities in laboratory streams

    Creator:
    Lomnicky, Gregg A.
    Abstract:
    Laboratory stream communities in simulated old growth second order streams were sampled June 1984 and June 1985 to advance an understanding of their organization and development, and their response to an environmental perturbance, the toxicant dieldrin. An interpenetrating hierarchical view of habitats and community subsystems was taken to conceptualize community...
    Resource Type:
    Masters Thesis
    Full Text:
    Macroinvertebrate Communities in Laboratory Streams. Redacted for privacy Abstract approved: 1441.6'am J. Liss

  • A hierarchical stream habitat classification system: development and demonstration

    Creator:
    Frissell, Christopher A.
    Abstract:
    Classification of Streams and stream habitats is useful for research involving establishment of monitoring stations, determining local impacts of land use practices, generalization from site-specific data, and assessment of basin-wide, cumulative impacts of human activities on streams and their biota. This thesis presents a framework for a hierarchical classification system,...
    Resource Type:
    Masters Thesis
    Full Text:
    below. W. J. Liss--Collaborated in development of the conceptual approach to classification, and

  • Stream habitat classification and restoration in the Blue Mountians of northeast Oregon

    Creator:
    Ebersole, Joseph Lamar
    Abstract:
    The restoration of rivers and streams should be based on a strong conceptual framework. Streams are developing systems. As such, streams exhibit temporal behaviors that change with changing stream environments. Underlying the dynamic development of streams is potential capacity. Streams express this capacity as an array of habitats over time...
    Resource Type:
    Masters Thesis

  • Age, growth, and diet of fish in the Waldo Lake natural-cultural system

    Creator:
    Swets, Nicola L.
    Abstract:
    Waldo Lake, located in the Oregon Cascades, is considered to be one of the most dilute lakes in the world. Even with very low nutrient concentrations and sparse populations of zooplankton, introduced fish in the lake are large in size and in good condition when compared to fish from other...
    Resource Type:
    Masters Thesis

  • Heterogeneous thermal habitat for northeast Oregon stream fishes

    Creator:
    Ebersole, Joseph L.
    Abstract:
    Discrete coldwater patches within warm streams provide potential thermal refuge for coldwater fishes during periods of heat stress. This analysis focused on heterogeneity in stream water temperatures as influenced by local influx of cooler subsurface waters. Using field thermal probes and recording thermistors, we identified and characterized coldwater patches potentially...
    Resource Type:
    Dissertation
    Full Text:
    Thermal Habitat for Northeast Oregon Stream Fishes. Abstract approved: William J. Liss Discrete

  • A steady-state model of ecological hierarchy

    Creator:
    Thompson, Grant Garrison
    Abstract:
    A generalized mathematical model of ecosystems is developed. The model begins with the general class of systems known as state-determined systems, in which the time-derivative of each state variable is a function of some subset of the set of all system state variables and .environmental parameters. A formal basis is...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: William J. Lis; A generalized mathematical model of ecosystems is developed. 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:
    Privacy Li William J. Liss As part of a hierarchical approach to classifying watersheds and stream

  • Arthropod community organization and development in pear

    Creator:
    Gut, Larry J.
    Abstract:
    Arthropod communities in pear are conceptualized as hierarchically organized systems in which several levels of organization or subsystems can be recognized between the species population level and the community as a whole. An individual tree is taken to be the community habitat with arthropod subcommunities developing on leaf, fruit and...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF Larry J. Gut for the degree of Doctor of Philosophy in Entomology