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Filtering by: Alternative title ssim Circular of information no. 221 Remove constraint Alternative title ssim: Circular of information no. 221 Committee Member Jones, Julia Remove constraint Committee Member: Jones, Julia

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  • Community gradients of Arctic macrolichens in relation to succession, grazing and the environment

    Creator:
    Holt, Emily A.
    Abstract:
    The purpose of this dissertation was to define macrolichen community gradients in relation to succession, grazing and the environment. First, species scores indicating when macrolichen species appeared following disturbance were derived from the literature. Weighted averaging of these data with a community matrix created a successional score for each sample...
    Resource Type:
    Dissertation
    Full Text:
    graminoids on the Seward Peninsula? (3) Combining information on patterns of recovery following

  • Tidal influence on downstream fining in gravel-bed rivers

    Creator:
    Coles, Derron Rafiq
    Abstract:
    This research examines the downstream fining phenomenon as it operates in coastal gravel-bed rivers of Oregon. Downstream fining is a change in bed composition toward smaller sediment sizes in the downstream direction. Changes in stream flow discharge and channel slope affect the rate of bed-load transport, thereby altering the downstream...
    Resource Type:
    Dissertation
    Full Text:
    increase in deposition of large particle sizes in the upstream reaches; however, there was no observable

  • Central place foraging and the winter village: a settlement pattern analysis in the lower Salmon River Canyon in Idaho

    Creator:
    Carlisle, Kendra
    Abstract:
    Hunter-gatherers depend on naturally occurring resources and, in order to survive, must overcome resource procurement challenges inherent in their environment. One challenge relates to the temporal and spatial availability of resources, which hunter-gatherers address, in part, through the strategic use of space to position themselves for optimal access to necessary...
    Resource Type:
    Masters Thesis
    Full Text:
    ________________________________________________________________________ AN ABSTRACT OF THE THESIS OF Kendra Carlisle for the degree of Master of Arts in Applied

  • Watershed-level patterns among stream amphibians in the Blue River watershed, West-Central Cascades of Oregon

    Creator:
    Hunter, Matthew G.
    Abstract:
    Most recent research on stream amphibians in the Pacific Northwest has focused on associations with reach-level or stand-level environmental features. Little is known about landscape-level distributions of these species or landscape-level aspects of their life-histories. I used a watershed-wide sample and logistic regression to develop models and maps of probability...
    Resource Type:
    Masters Thesis
    Full Text:
    species. There is no information describing the watershed-level distribution of important breeding areas

  • Predicting the stability, equilibrium response, and nonequilibrium dynamics of ecological systems

    Creator:
    Hosack, Geoffrey R.
    Abstract:
    In this dissertation, new theory and its applications are developed to predict three properties of complex ecological communities: stability, equilibrium response, and non-equilibrium dynamics. First, a graph-theoretic analysis identifies the interconnections in a complex ecosystem that promote or diminish stability (Chapter 2). The hierarchy of interactions that influences stability and...
    Resource Type:
    Dissertation
    Full Text:
    understood. Such information would allow experimental and management manipulation of complex communities

  • A macroscale measurement and modeling approach to improve understanding of the hydrology of steep, forested hillslopes

    Creator:
    Graham, Christopher Brian
    Abstract:
    The dominant controls on flow generation in steep, forested hillslopes are poorly understood. This dissertation examined the dominant flow processes operating at the hillslope scale, using a combined macroscale measurement and model development and analysis framework. Irrigation experiments at two steep forested hillslopes were conducted to isolate individual hillslope flow...
    Resource Type:
    Dissertation
    Full Text:
    another three in a hut in the middle of nowhere, with no phone, TV, radio, internet, but lots of large

  • Reactive polyphenols and dissolved nutrients in a nitrogen-limited headwater catchment, western Cascades, Oregon, USA

    Creator:
    Rasmussen, Janet K.
    Abstract:
    In undisturbed N-limited forested catchments, DON may represent over 90% of the total N lost in streams. Some ecologists have suggested that plant-derived reactive polyphenols may be responsible for DON binding and transport because polyphenol-protein complexes are known to precipitate out of solution, bind to mineral surfaces or organic matter...
    Resource Type:
    Masters Thesis
    Full Text:
    pollution. Despite the interest in polyphenols as a mechanism of DON sequestration and transport, no study

  • Understanding the impact of climate change on snowpack extent and measurement in the Columbia River Basin and nested sub basins

    Creator:
    Brown, Aimee Lyn
    Abstract:
    Shifting climate patterns in the Columbia River basin are affecting snow pack, and, as a result, stream flow throughout the region. In the Oregon Cascades, ever growing populations, and their associated activities, place increasing stress on an already over allocated hydrologic system. Political pressures, including the possibility of renegotiation or...
    Resource Type:
    Masters Thesis
    Full Text:
    
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  • Lava Flow Lobation and Margin Analysis

    Creator:
    Peckyno, Robert S.
    Abstract:
    Comparative investigations based on volcanic morphology suffer from the lack of a large terrestrial baseline for comparison. To fill this gap, the Lava Flow Morphology Database (LAMDA) was proposed as a GIS based central clearinghouse for remote and field investigations of volcanic morphology. This study presents an analysis of LAMDA’S...
    Resource Type:
    Capstone Project
    Full Text:
    , complexity, and cost (Lopes, 1993). Consequently, a majority of the information currently known about

  • Population genetics of ranid frogs : investigating effective population size and gene flow

    Creator:
    Phillipsen, Ivan C.
    Abstract:
    This dissertation focuses on the evolutionary forces of genetic drift and gene flow in frog populations. The balance of these two forces and the force of mutation largely determine the amount of neutral genetic variation within populations as well as the degree of genetic similarity among populations. The stochastic evolutionary...
    Resource Type:
    Dissertation
    Full Text:
    at the egg and metamorph stages were similar. Thus, we found no evidence of inflated variance in