Search Constraints

Start Over
Filtering by: Subject Bird populations -- Oregon Remove constraint Subject: Bird populations -- Oregon Advisor Edge, W. Daniel Remove constraint Advisor: Edge, W. Daniel

Search Results

  • 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:
    suppression and overgrazing. Sagebrush-obligate species are experiencing population declines as a result of

  • Twenty-year changes in riparian bird communities of east-central Oregon

    Creator:
    Ellis, Michael S.
    Abstract:
    Over the last 50 years, riparian zones in the semi-arid West have gained recognition as disproportionately important habitats for both breeding bird communities and agricultural operations. Despite growing interest in exploring avian-habitat relationships in these systems to better inform land management, few studies have attempted to describe temporal changes in...
    Resource Type:
    Masters Thesis
    Full Text:
    changes in riparian bird communities of east-central Oregon. Abstract approved

  • Breeding bird community composition in relation to riparian vegetation structure in grazed habitats

    Creator:
    Sanders, Todd Alan
    Abstract:
    Riparian zones provide habitat for breeding birds in the semiarid western United States; however, there are few data available that address the effects of livestock grazing strategies on riparian habitats and avian communities. Documenting avian community composition in different riparian vegetation communities and relating vegetation communities to livestock grazing strategies...
    Resource Type:
    Masters Thesis
    Full Text:
    streamside riparian areas of Bear and Silvies valleys in eastern Oregon during 1993 and 1994. Bird and