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Osprey distribution, abundance, and status in western North America: I. The northern California population

Northwest Science

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Abstract

An estimated 355+ 40 pairs (95 percent C.I.) of Ospreys (Pandion haliaetus carolinensis) nested in the northern California survey area in 1975. Eighty-one pairs were estimated along the extreme northern coast in Del Norte and Humboldt Counties. One hundred and forty-four pairs were estimated along California's northern coast in Mendociuo, Sonoma, and Marin Counties. The northern interior region, primarily in Siskiyou, Trinity, Shasta, Lassen, and Plumas Counties, contained an estimated 130 pairs. Forry-nine percent of the interior Osprey population is associated with reservoirs that were not present in 1900. We believe more Ospreys are present in the interior now than 75 years ago because of the increase in suitable habitat; nevertheless, populations at Shasta Lake and Clair Engle Lake are now exhibiting below-normal production rates and local declines. The long-term status of the coastal population, nesting along rivers, streams, and bays, is not clear. Recent production rates from two segments of the coastal population appear to be normal, but production at Usal Creek is below normal.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Osprey distribution, abundance, and status in western North America: I. The northern California population
Series title:
Northwest Science
Volume
52
Issue:
3
Year Published:
1978
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
261-271
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Northwest Science
First page:
261
Last page:
271
Number of Pages:
11