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Population Demography of Northern Spotted Owls: Published for the Cooper Ornithological Society
By Eric Forsman
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About this ebook
The Northern Spotted Owl, a threatened species that occurs in coniferous forests in the western United States, has become a well-known environmental symbol. But how is the owl actually faring? This book contains the results of a long-term effort by a large group of leading researchers to document population trends of the Northern Spotted Owl. The study was conducted on 11 areas in the Pacific Northwest from 1985 to 2008, and its objectives were both to evaluate population trends and to assess relationships between reproductive rates and recruitment of owls and covariates such as weather, habitat, and the invasion of a closely related species, the Barred Owl. Among other findings, the study shows that fecundity was declining in five populations, stable in three, and increasing in three areas. Annual apparent survival rates of adults were declining in 10 out of 11 areas. This broad, synthetic work provides the most complete and up-to-date picture of the population status of this inconspicuous forest owl, which is at the center of the complex and often volatile debate regarding the management of forest lands in the western United States.
Researchers:
Steven H. Ackers
Lawrence S. Andrews
David R. Anderson
Robert G. Anthony
Brian L. Biswell
Kenneth P. Burnham
Peter C. Carlson
Raymond J. Davis
Lowell V. Diller
Katie M. Dugger
Eric D. Forsman
Alan B. Franklin
Elizabeth M. Glenn
Scott A. Gremel
Dale R. Herter
J. Mark Higley
James E. Hines
Robert B. Horn
Joseph B. Lint
James D. Nichols
Janice A. Reid
James P. Schaberl
Carl J. Schwarz
Thomas J. Snetsinger
Stan G. Sovern
Gary C. White
Researchers:
Steven H. Ackers
Lawrence S. Andrews
David R. Anderson
Robert G. Anthony
Brian L. Biswell
Kenneth P. Burnham
Peter C. Carlson
Raymond J. Davis
Lowell V. Diller
Katie M. Dugger
Eric D. Forsman
Alan B. Franklin
Elizabeth M. Glenn
Scott A. Gremel
Dale R. Herter
J. Mark Higley
James E. Hines
Robert B. Horn
Joseph B. Lint
James D. Nichols
Janice A. Reid
James P. Schaberl
Carl J. Schwarz
Thomas J. Snetsinger
Stan G. Sovern
Gary C. White
Author
Eric Forsman
Eric D. Forsman, who collaborated with a team of twenty-seven researchers to produce this report, is a Wildlife Biologist with the USDA Forest Service’s Pacific Northwest Research Station, and also holds a courtesy faculty position as an Associate Professor in the Department of Fisheries and Wildlife at Oregon State University.
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Population Demography of Northern Spotted Owls - Eric Forsman
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