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Population Demography of Northern Spotted Owls

Melanie Colón
  • Eric Forsman University of California Press 2011 Berkeley, California United States http://www.ucpress.edu/book.php?isbn=9780520270084

    120 pages


    Adobe PDF E-Book ISBN: 978052095059

    ePUB Format ISBN: 9780520950597

    English , Nearctic, , Canada, United States, , Owls (Strigidae), Studies in Avian Biology 40 Cooper Ornithological Society 07/01/2011 9780520270084 No value 07/01/2011 978052095059

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

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