Ulteriori informazioni
Zusatztext "One of the most exact and large-scale metapopulation analyses in the world." Informationen zum Autor 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. Klappentext "In addition to state of the art analysis of huge datasets! this monograph provides a wonderful example of cooperation among scientists and field biologists to achieve a common goal. The monograph provides an analysis template for any species whose conservation is controversial or its population analysis challenging. Therefore! it is a must-read for all population ecologists! wildlife biologists and managers! conservation biologists! and graduate students in these fields."-R.J. Gutiérrez! University of Minnesota "This state-of-the-art examination of the demography of the Northern Spotted Owl serves as a model of the information needed for truly scientific conservation of at-risk species. If only we could gather similar information for all plants and animals facing uncertain futures."-John Faaborg! University of Missouri at Columbia "This book on demography of spotted owl populations is an excellent and comprehensive contribution to the literature on ecology and conservation of owls. It warrants to be read by all biologists and naturalists interested in fascinating raptors and owls"--Erkki Korpimäki! University of Turku! Finland Zusammenfassung 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 Inhaltsverzeichnis INTRODUCTION STUDY AREAS FIELD METHODS ANALYTICAL METHODS DEVELOPMENT OF COVARIATES Barred Owl covariate Habitat covariates Weather and climate covariates Land ownership! ecoregion! and latitude covariates Reproduction covariate FECUNDITY Individual study areas Meta-analysis of fecundity APPARENT SU...
