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  1. Bird use of revetted riverbanks in the Willamette Valley

    Over 115 miles of rock revetments that serve to protect river banks have been constructed in the Willamette Basin. In this study the spring and summer bird use of Willamette Basin revetments is examined....

  2. Schedule interactions and stimulus control

    Four types of schedule interactions have been defined: positive contrast, negative contrast, positive induction, and negative induction. Most work has centered on the necessary conditions for positive contrast....

  3. Head Movement and Vision in Underwater-Feeding Birds of Stream, Lake, and Seashore

    Studies head movement and vision in underwater-feeding birds. Review of relevant literature on the physiological and behavioral aspects of vision; Role of vertical head movement as an aid in the acquisition of...

  4. Possible Avian Influences in the Distribution of Dwarf Mistletoe

    The goal of this investigation was to determine the potential of birds as vectors for the movement of dwarf mistletoe seeds and the means by which such movement could occur. Birds would greatly speed the rate...

  5. The Importance of Urban Habitat Connectivity and Influence on Native Avian Species and Community Science

    In what ways do small-scale urban backyards contribute to local bird abundance and biodiversity? In what ways might these yards serve as an ‘extension’ of neighboring native forest areas? This project...

  6. Community Science and the Ecological Merits of Backyard Habitat Patches and Adjacent Green-Spaces for Urban Avian Species

    In what ways do small-scale urban backyards contribute to local bird abundance and biodiversity? In what ways might these yards serve as an ‘extension’ of neighboring native forest areas? This project...

  7. A Survey for Leucocytozoon Simondi Mathis and Leger (1910) in Canada Geese of the Malheur Wildlife Refuge

    Blood smears of blood collected in 1971 and 1972 from 291 Canada geese at Malheur National Wildlife Refuge were examined to determine the incidence of the avian malarial parasite, Leucocytozoon simondi. No...

  8. Factors affecting the population of raptorial birds on Sauvie Island, Oregon

    This study is an analysis of the various factors affecting the population of raptorial birds on Sauvie Island, Oregon. A census of diurnal and nocturnal raptors was carried out along with an analysis of food...

  9. Nesting Microhabitat Use by a Ground-nesting Songbird: Strict Preferences or Random Choice?

    Nest site choice of birds has the potential to affect predation rates on nests and reproductive success for many bird species, and is thus tied closely to fitness. Vegetation at a particular site influences...

  10. Avian population trends within the evolving agricultural landscape of the eastern and central United States

    State-level Breeding Bird Survey (1980-1998) and U.S. Department of Agriculture statistics were used to test the hypothesis that changes in agricultural land use within the eastern and central U.S. have driven...

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