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Filtering by: Creator Jacobs, Dakota C. Remove constraint Creator: Jacobs, Dakota C. Committee Member Pereira, Cliff Remove constraint Committee Member: Pereira, Cliff Degree Field Wildlife Science Remove constraint Degree Field: Wildlife Science

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  • Nesting ecology of mallards in the Willamette Valley of Oregon

    Creator:
    Rickerson, Eric V.
    Abstract:
    Although widely studied in many portions of North America, little is known about the specific habitat requirements of mallard ducks (Anas platyrhynchos) during the breeding season in western Oregon. I radio-marked 72 female mallards in the Willamette Valley of Oregon in March-April 1995-96 to document wetland habitat selection during pre-nesting...
    Resource Type:
    Masters Thesis
    Full Text:
    and September (Franklin and Dryness 1988). Annual temperatures range from 4.0 to 18.9° C, with an

  • Ecology of mallard ducklings on Lower Klamath National Wildlife Refuge, California

    Creator:
    Mauser, David M.
    Abstract:
    The ecology of female mallards (Anas platyrhynchos) and their broods was studied during 1988-90 on Lower Klamath National Wildlife Refuge, California. Survival of 127 radio-marked ducklings from 64 broods was 0.18 to 10 days of life, and 0.37 and 0.34 to fledging for 1988, 1989, and 1990, respectively. For the...
    Resource Type:
    Dissertation
    Full Text:
    , 1988-90. C = confirmed agent of mortality, P = probable agent, and U = unknown agent. . . . 18 CHAPTER

  • Range-wide abundance and fluctuating asymmetry patterns of sagebrush-obligate passerine birds

    Creator:
    Krissman, Cortnie M.
    Abstract:
    North American sagebrush (Artemisia spp.) ecosystems are suffering from reductions in habitat extent and quality. Only about 50% of sagebrush remains from pre-settlement conditions, and much of the remaining habitat is fragmented or degraded by invasive species, fire suppression and overgrazing. Sagebrush-obligate species are experiencing population declines as a result...
    Resource Type:
    Masters Thesis
    Full Text:
    ....................................................................92 C. Trellis graph based on negative binomial regression model with percent sagebrush and

  • Local weather, regional climate, and population dynamics of northern spotted owls in Washington and Oregon

    Creator:
    Glenn, Elizabeth M.
    Abstract:
    Since the early 1990s, declines in northern spotted owl (Strix occidentalis caurina) populations have been documented through extensive field surveys and range-wide demographic analyses. Although loss of late-successional forest has been credited as the primary cause for spotted owl population declines, environmental variation has also been shown to influence vital...
    Resource Type:
    Dissertation
    Full Text:
    conditions, total snowfall, and number of days ≥ 32˚C on 6 northern spotted owl study areas in Oregon and

  • Habitat selection, reproductive success, and site fidelity of burrowing owls in a grassland ecosystem

    Creator:
    Ronan, Noelle A.
    Abstract:
    I used a comparative and experimental approach to examine nest habitat selection, reproductive success, and nest site fidelity of burrowing owls (Athene cunicularia) in a large, non-fragmented grassland in southwest California. In 1999, I compared habitat characteristics between nest sites (n = 31) and randomly selected, unoccupied burrows (n =...
    Resource Type:
    Masters Thesis
    Full Text:
    (Burnham and Anderson 1998). C The relative likelihood or weight of the model, based on AICc (Burnham and