Effects of sea ice extent and food availability on spatial and temporal distribution of polar bears during the fall open-water period in the Southern Beaufort Sea |
| |
| Authors: | S. Schliebe K. D. Rode J. S. Gleason J. Wilder K. Proffitt T. J. Evans S. Miller |
| |
| Affiliation: | (1) Marine Mammals Management, U.S. Fish and Wildlife Service, 1011 E. Tudor Road, Anchorage, AK 99503, USA;(2) Environmental Studies Section, U.S. Minerals Management Service, 3801 Centerpoint Drive, Suite 500, Anchorage, AK 99503, USA;(3) Present address: Kulm Wetland Management District, U.S. Fish and Wildlife Service, 1 First Street SW, P.O. Box E, Kulm, ND 58456, USA;(4) Present address: Department of Ecology, Montana State University, Bozeman, MT 59717-3460, USA |
| |
| Abstract: | We investigated the relationship between sea ice conditions, food availability, and the fall distribution of polar bears (Ursus maritimus) in terrestrial habitats of the Southern Beaufort Sea via weekly aerial surveys in 2000–2005. Aerial surveys were conducted weekly during September and October along the Southern Beaufort Sea coastline and barrier islands between Barrow and the Canadian border to determine polar bear density on land. The number of bears on land both within and among years increased when sea-ice was retreated furthest from the shore. However, spatial distribution also appeared to be related to the availability of subsistence-harvested bowhead whale (Balaena mysticetus) carcasses and the density of ringed seals (Phoca hispida) in offshore waters. Our results suggest that long-term reductions in sea-ice could result in an increasing proportion of the Southern Beaufort Sea polar bear population coming on land during the fall open-water period and an increase in the amount of time individual bears spend on land. |
| |
| Keywords: | Polar bears Sea ice Distribution Bear density |
| 本文献已被 SpringerLink 等数据库收录！ |
|
