MODELING OF SITE OCCUPANCY DYNAMICS FOR NORTHERN SPOTTED OWLS, WITH EMPHASIS ON THE EFFECTS OF BARRED OWLS
| Autor: | Gail S. Olson, Peter J. Loschl, Janice A. Reid, Elizabeth M. Glenn, Steven H. Ackers, Robert G. Anthony, William J. Ripple, Eric D. Forsman, Katie M. Dugger |
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| Rok vydání: | 2005 |
| Předmět: |
Extinction
Ecology Occupancy biology Range (biology) Wildlife biology.organism_classification Geography Local extinction parasitic diseases Threatened species Site occupancy Northern spotted owl General Earth and Planetary Sciences psychological phenomena and processes Ecology Evolution Behavior and Systematics Nature and Landscape Conservation General Environmental Science |
| Zdroj: | Journal of Wildlife Management. 69:918-932 |
| ISSN: | 1937-2817 0022-541X |
| Popis: | Northern spotted owls (Strix occidentalis caurina) have been studied intensively since their listing as a threatened species by the U.S. Fish and Wildlife Service in 1990. Studies of spotted owl site occupancy have used various binary response measures, but most of these studies have made the assumption that detectability is perfect, or at least high and not variable. Further, previous studies did not consider temporal variation in site occupancy. We used relatively new methods for open population modeling of site occupancy that incorporated imperfect and variable detectability of spotted owls and allowed modeling of temporal variation in site occupancy, extinction, and colonization probabilities. We also examined the effects of barred owl (S. varia) presence on these parameters. We used spotted owl survey data from 1990 to 2002 for 3 study areas in Oregon, USA, and we used program MARK to develop and analyze site occupancy models. We found per visit detection probabilities averaged |
| Databáze: | OpenAIRE |
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