| Publication Type: | Journal Article |
| Year of Publication: | 1985 |
| Authors: | Keister, Jr., GP, Anthony, RG, H. Holbo, R |
| Journal: | The Wilson Bulletin |
| Volume: | 97 |
| Issue: | 2 |
| Date Published: | 1985 |
| ISBN Number: | 00435643 |
| Keywords: | Accipitridae, Haliaeetus, Haliaeetus leucocephalus |
| Abstract: | During the winter of 1979-80, microclimatic variables were measured in four Bald Eagle (Haliaeetus leucocephalus) communal roosts located in the forests around the Klamath Basin of northern California and southern Oregon. An energetics model for roosting Bald Eagles was developed from microclimatic variables to compare the different roosts. All roosts were relatively protected from high winds in comparison to feeding areas (represented by Kingsley weather station, which was located on the basin floor in nearby Klamath Falls, Oregon) and showed a temperature advantage during midwinter. Higher temperature, lower radiation loss, and lower winds in the Bear Valley roost contributed to a significantly lower (P ≤ 0.01) nightly energy demand on Bald Eagles than in any other roost. Bear Valley had a 4 and 7% savings in energy demand compared with the most stressful roost, and a 10 and 6% savings compared with Kingsley weather station during midwinter and late winter, respectively. Differential use of the four roosts by Bald Eagles for communal roosting was not related to differences in energy demand between the roosts. Savings in energy due to use of communal roosts during night were not great enough to explain flight of Bald Eagles to roosts in the Klamath Basin. |
| URL: | http://www.jstor.org/stable/4162067 |
| Short Title: | The Wilson Bulletin |
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