Habitat selection by nesting Swainson's hawks : Brian Woodbridge a hierarchical approach /
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TextPublication details: OR : Oregon State University, 1991.Description: (8) 80 leaves : ill. ; 28 cmOnline resources: Abstract: The habitat relationships of Swainson's hawks in northern California were studied at several levels of resolution: 1) distribution of hawk populations among three adjacent geographic areas, 2) density of hawk territories among landscapes within a single geographic area, 3)habitats associated with individual nesting territories, and 4)selection of foraging habitats and prey resources by individual hawks.Patterns of habitat selection observed at each level were compared to results obtained at other levels, and to temporal variations in habitat quality. Individual Swainson's hawks exhibited strong selection for specific habitats wherein prey availability was highest, however these habitats were not found in increased proportions in Swainson's hawk territories. Similarly, densities of Swainson's hawk territories among different landscape did not reflect the availability of high-quality habitat; many pairs nested in marginal habitats and exhibited low reproductive success and large area
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Thesis(M.S.)--Oregon State University, 1991.
Includes bibliographical references (leaves 74-80).
The habitat relationships of Swainson's hawks in northern California were studied at several levels of resolution: 1) distribution of hawk populations among three adjacent geographic areas, 2) density of hawk territories among landscapes within a single geographic area, 3)habitats associated with individual nesting territories, and 4)selection of foraging habitats and prey resources by individual hawks.Patterns of habitat selection observed at each level were compared to results obtained at other levels, and to temporal variations in habitat quality. Individual Swainson's hawks exhibited strong selection for specific habitats wherein prey availability was highest, however these habitats were not found in increased proportions in Swainson's hawk territories. Similarly, densities of Swainson's hawk territories among different landscape did not reflect the availability of high-quality habitat; many pairs nested in marginal habitats and exhibited low reproductive success and large area