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Media type:
E-Article
Title:
Distribution and Productivity of Nesting Bald Eagles in Oregon, 1978-1982
Contributor:
Isaacs, Frank B.;
Anthony, Robert G.;
Anderson, Robert J.
Published:
Pacific Northwest Bird and Mammal Society, 1983
Published in:
The Murrelet, 64 (1983) 2, Seite 33-38
Language:
English
ISSN:
0027-3716
Origination:
Footnote:
Description:
During 1978-1982, 270 Bald Eagle nests at 147 breeding sites were located and observed in Oregon. Three regions of nesting concentration were (1) the Klamath Basin, (2) the Cascade lakes, and (3) the coast and lower Columbia River. Bald Eagle breeding activities were observed between 1 January and 31 August with adults observed at some nest sites year-round. The 100 occupied sites recorded in 1982 represent a minimum population of 100 breeding pairs of Bald Eagles in the state. Productivity (0.72 to 1.18 young fledged/occupied site) was comparable to populations in Alaska, Florida, and the Great Lakes states where populations were considered to be stable. However, a possible decline in productivity from 1978 to 1982 should be monitored in subsequent years to assess the stability of the breeding population.