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Population trajectory of burrowing owls (Athene cunicularia) in eastern Washington

Northwest Science

6701_Conway.pdf
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Abstract

Anecdotal evidence suggests that burrowing owls have declined in Washington. The Washington Department of Fish and Wildlife is currently conducting a status review for burrowing owls which will help determine whether they should be listed as threatened or endangered in the state. To provide insights into the current status of burrowing owls (Athene cunicularia), we analyzed data from the North American Breeding Bird Survey using two analytical approaches to determine their current population trajectory in eastern Washington. We used a one-sample t-test to examine whether trend estimates across all BBS routes in Washington differed from zero. We also used a mixed model analysis to estimate the rate of decline in number of burrowing owls detected between 1968 and 2005. The slope in number of burrowing owls detected was negative for 12 of the 16 BBS routes in Washington that have detected burrowing owls. Numbers of breeding burrowing owls detected in eastern Washington declined at a rate of 1.5% annually. We suggest that all BBS routes that have detected burrowing owls in past years in eastern Washington be surveyed annually and additional surveys conducted to track population trends of burrowing owls at finer spatial scales in eastern Washington. In the meantime, land management and regulatory agencies should ensure that publicly managed areas with breeding burrowing owls are not degraded and should implement education and outreach programs to promote protection of privately owned areas with breeding owls.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Population trajectory of burrowing owls (Athene cunicularia) in eastern Washington
Series title:
Northwest Science
Volume
80
Issue:
4
Year Published:
2006
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
292-297
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
292
Last page:
297
Number of Pages:
6