Search Constraints

Start Over
Filtering by: Creator Townsend, M. Shaun Remove constraint Creator: Townsend, M. Shaun Committee Member Menge, Bruce Remove constraint Committee Member: Menge, Bruce

Search Results

  • Formation and maintenance of fish assemblages in a high desert Oregon stream

    Creator:
    Pearsons, Todd N.
    Abstract:
    Considerable controversy exists about how fish assemblages are organized. I explicitly took fish movement into account while I studied the effects of disturbance, habitat complexity, and predation at different times of the summer to understand the major factors influencing assemblage structure in a high desert Oregon stream. The effects of...
    Resource Type:
    Dissertation
    Full Text:
    (100 m reaches) and 1989 (150 m reaches) in Rock Creek (RC), Murderers Creek (MC), and Fields Creek

  • Drought, dispersal, and community dynamics in arid-land streams

    Creator:
    Bogan, Michael T.
    Abstract:
    Understanding the mechanisms that regulate local species diversity and community structure is a perennial goal of ecology. Local community structure can be viewed as the result of numerous local and regional processes; these processes act as filters that reduce the regional species pool down to the observed local community. In...
    Resource Type:
    Dissertation
    Full Text:
    species richness (± SE) in replicate artificial pools at three distances (5, 75, 250 m) inland from

  • Multiple stressors and amphibian population declines

    Creator:
    Hatch, Audrey C.
    Abstract:
    In the past decade, declines in amphibian populations have captured scientific and popular interest. The causes of the declines are likely to be complex and involve interactions between several environmental stressors. Using multifactorial experiments, I investigated the combined effects of several anthropogenic stressors on developing amphibians in Oregon, USA. In...
    Resource Type:
    Dissertation
    Full Text:
    , making them more susceptible to predation by fishing spiders (Dolomedes triton) (Moore and Townsend 1998

  • Environmental influences on host-pathogen dynamics of the amphibian chytrid fungus

    Creator:
    Buck, Julia C.
    Abstract:
    The causes of the global biodiversity crisis are varied and complex. Anthropogenic threats may act in isolation, or interact additively or synergistically with each other or with natural stressors to affect sensitive taxa. The recent emergence of many infectious diseases in wildlife has brought attention to the role of disease...
    Resource Type:
    Dissertation

  • Population and production ecology of Lipsothrix spp. (Diptera:Tipulidae)

    Creator:
    Dudley, Thomas L.
    Abstract:
    Craneflies of the genus Lipsothrix inhabit decomposing wood in streams. The life cycles and ecological relationships of L. nigrilinea (Doane) and L. fenderi Alexander were investigated to determine how they exploit and respond to the wood habitat and their role in degradation of woody debris in western Oregon. Surveys of...
    Resource Type:
    Masters Thesis
    Full Text:
    the amount of wood debris (as surface area available/100 m section) in the stream. Other physical

  • Amphibian communities and climate change : Where ecological processes meet evolutionary interactions

    Creator:
    Thurman, Lindsey L.
    Abstract:
    Forecasts of the impacts of climate change have traditionally focused on individual species and their phenotypes, phenology, or distribution. However, shifts in species distributions and the resulting reorganization of community composition represent an important violation to the assumption of species acting in isolation. Whereas species may respond individualistically to climate...
    Resource Type:
    Dissertation
    Full Text:
    deposited from Little Three Creek Lake (Deschutes County, Oregon; 2046 m elevation) in July of 2012

  • Indirect effects of ultraviolet-B radiation on larval amphibians as mediated by food quality and trophic interactions

    Creator:
    Scheessele, Erin A.
    Abstract:
    Ultraviolet-B radiation (UVB) is an abiotic stressor in both terrestrial and aquatic systems. The stratospheric ozone layer, depleted due to anthropogenic activities and the cause of elevated UVB at earth's surface over the last four decades, is predicted to recover by 2065. However, UVB levels in aquatic systems may continue...
    Resource Type:
    Dissertation