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Filtering by: Creator Hansen, Sarah Anne Remove constraint Creator: Hansen, Sarah Anne Committee Member Jones, Julia Remove constraint Committee Member: Jones, Julia

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  • Forest Fire Effects on Radiative and Turbulent Fluxes over Snow : Implications for Snow Hydrology

    Creator:
    Gleason, Kelly E.
    Abstract:
    As a result of a warming climate, subsequent declining snowpack, and a century of fire suppression, forest fires are increasing across the western United States. However, we still do not fully understand how forest fire effects snowpack energy balance, nor the volume and availability of snow melt and associated water...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: _____________________________________________________________________ Anne W. Nolin

  • Seeing the snow through the trees : towards a validated canopy adjustment for satellite fractional snow-covered area

    Creator:
    Coons, Lexi
    Abstract:
    Forest canopy cover presents a major challenge for remote sensing of fractional snow-covered area (ƒSCA). Snow cover is systematically underestimated where satellites sensors cannot penetrate the forest canopy. Current canopy adjustments scale observable ƒSCA with the vegetation fraction, assuming that snow cover distributions are similar between sub-canopy and open locations....
    Resource Type:
    Masters Thesis
    Full Text:
    : ____________________________________________ Anne W. Nolin Forest canopy cover presents a major challenge for remote sensing of

  • Effects of spatial scale and heterogeneity on avian occupancy dynamics and population trends in forested mountain landscapes

    Creator:
    Frey, Sarah J. K.
    Abstract:
    Population trends and patterns in species distributions are the major currencies used to examine responses by biodiversity to changing environments. Effective conservation recommendations require that models of both distribution dynamics and population trends accurately reflect reality. However, identification of the appropriate temporal and spatial scales of animal response, and then...
    Resource Type:
    Dissertation
    Full Text:
    Sarah J. K. Frey for the degree of Doctor of Philosophy in Forest Science presented on December 9, 2014

  • Cooperation and Conflict Dynamics in Small-Scale Fisheries

    Creator:
    Villegas, Ciera A.
    Abstract:
    Small-scale fisheries account for at least 40 percent of global fisheries catch, 90 percent of the people employed along capture fisheries value chains operate in small-scale fisheries, and 45 million women participate in small-scale fisheries globally. The past few years have brought warnings from policymakers and resource managers about risks...
    Resource Type:
    Dissertation
    Full Text:
    with editorial assistance from Dr. Michael Harte, Dr. Anne Devan-Song, and Dr. Sarah M. Glaser

  • Detection and Segmentation of Bird Song in Noisy Environments

    Creator:
    Neal, Lawrence W.
    Abstract:
    Recent work in machine learning concerns the detection and identification of bird species from audio recordings of their vocalizations. Such analysis can yield valuable ecological information concerning the activity and distribution of species in the wild. Current species-identification methods require individual syllables of bird audio as input, but field-collected audio...
    Resource Type:
    Honors College Thesis
    Full Text:
    , Sarah Frey, Adam Hadley, and all the others who have made possible the research undertaken by the OSU

  • Nearshore distribution of barnacle and mussel larvae and oceanographic mechanisms of onshore transport and delivery

    Creator:
    Tyburczy, Joe A.
    Abstract:
    Recruitment of larvae from the plankton is an important determinant of community structure in marine systems. In populations of many marine species, recruitment determines the basic demographic parameters of immigration, emigration, and reproduction. Moreover, the effect of recruitment as an "ecological subsidy" can determine the strength of interactions among species...
    Resource Type:
    Dissertation
    Full Text:
    including Sarah Dudas, Ruth Milston-Clements, Chris and Susan Holmes, Matt Robart, Kimberly Page-Albins

  • 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:
    Bogan, Angela Brandt, Sarah Eddy, Dafne Eerkes-Medrano, Deb Finn, Chris Friesen, Steph Gervasi, Margo

  • Spatio-temporal Patterns and Ecological Drivers of Harbor Porpoise (Phocoena phocoena) off the Central Oregon Coast, USA

    Creator:
    Holdman, Amanda
    Abstract:
    The marine environment is under increasing pressure from human activities worldwide, particularly in coastal waters, creating a need to better understand fine-scale distributions of highly mobile species that occur in the area, as they are frequently most threatened. Harbor porpoise (Phocoena phocoena) occur frequently in Oregon’s nearshore habitat, but due...
    Resource Type:
    Masters Thesis
    Full Text:
    Peterson, Jennifer Fisher, and the entire Bill Peterson lab as well as Sarah Henkel and the Benthic

  • 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:
    , Sarah Nunn and Amanda Hardman provided invaluable support to make the most of my two hours at each

  • Interactive visualization of diversity in multivariate data sets unified across fields of study

    Creator:
    Pham, Tuan N. T.
    Abstract:
    The study of the diversity of multivariate objects shares common characteristics across disciplines, including ecology and organizational management. Nevertheless, experts in these two disciplines have adopted somewhat separate diversity concepts and analysis techniques, limiting the ability of potentially sharing and cross comparing these concerns. Moreover, while complex diversity data may...
    Resource Type:
    Dissertation