Population Demography of Northern Spotted Owls / Eric D. Forsman. Robert G. Anthony, Katie M. Dugger, Elizabeth M. Glenn, Alan B. Franklin, Gary C. White, Carl J. Schwarz, Kenneth P. Burnham, David R. Anderson , James D. Nichols, James E. Hines, Joseph B. Lint, Raymond J. Davis, Steven H. Ackers, Lawrence S. Andrews , Brian L. Biswell, Peter C. Carlson, Lowell V. Diller, Scott A. Gremel, Dale R. Herter, J. Mark Higley, Robert B. Horn, Janice A. Reid, Jeremy Rockweit , James P. Schaberl, Thomas J. Snetsinger, Stan G. Sovern.

• STUDY AREAS -- FIELD METHODS -- ANALYTICAL METHODS -- Development of Covariates -- Fecundity -- Apparent Survival -- Annual Rate of Population Change (λ) -- Statistical Conventions -- WORKSHOP PROTOCOLS -- RESULTS -- Fecundity -- Apparent Survival -- Annual Rate of Population Change -- DISCUSSION -- Fecundity -- Apparent Survival -- Annual Rate of Population Change and Realized Rates of Population Change -- Status of Owl Populations in the Eight NWFP Monitoring Areas -- Associations Between Demographic Parameters and Covariates -- Potential Biases in Estimates of Demographic Parameters -- Summary, Conclusions, and Recommendations. 

• 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.

Ämnesord

Northern spotted owl  (LCSH)

Bird populations  (LCSH)

SCIENCE / Life Sciences / Zoology / Ornithology 

Genre

Electronic books 

Publikations- och innehållstyp

598.97 (DDC)

Ugge (kssb/8 (machine generated))