Population Demography of Northern Spotted Owls: Published for the Cooper Ornithological SocietyThe 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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Population Demography of Northern Spotted Owls: Published for the Cooper ... Eric Forsman Limited preview - 2011 |
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11 study areas 40 Forsman additive sex analysis apparent survival areas in Washington AVIAN BIOLOGY Barred Owl covariate Barred Owl detections Barred Owl effect best model Burnham California coefficients confidence intervals cover of suitable declines demographic rates DEMOGRAPHY OF NORTHERN Douglas-fir E. D. Forsman early nesting season Ecology ecoregions effect of Barred estimates evidence fecundity female fixed effects models Franklin HAB1 habitat covariates individual study areas meta-analysis models that included negative effect Northern Spotted Owls number of young overdispersion owl activity centers p(best structure p(g s t Pacific Decadal Oscillation PDSI percent cover population change POPULATION DEMOGRAPHY presence of Barred QAIC R. G. Anthony R. J. Gutiérrez random effects models rate of population Southern Oscillation Index structure from 2–9 STUDIES IN AVIAN suitable owl habitat Survival & Recruitment survival rates territories with Barred tion USDA Forest Service USDI weather