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Invariant polar bear habitat selection during a period of sea ice loss

September 1, 2016

Climate change is expected to alter many species' habitat. A species' ability to adjust to these changes is partially determined by their ability to adjust habitat selection preferences to new environmental conditions. Sea ice loss has forced polar bears (Ursus maritimus) to spend longer periods annually over less productive waters, which may be a primary driver of population declines. A negative population response to greater time spent over less productive water implies, however, that prey are not also shifting their space use in response to sea ice loss. We show that polar bear habitat selection in the Chukchi Sea has not changed between periods before and after significant sea ice loss, leading to a 75% reduction of highly selected habitat in summer. Summer was the only period with loss of highly selected habitat, supporting the contention that summer will be a critical period for polar bears as sea ice loss continues. Our results indicate that bears are either unable to shift selection patterns to reflect new prey use patterns or that there has not been a shift towards polar basin waters becoming more productive for prey. Continued sea ice loss is likely to further reduce habitat with population-level consequences for polar bears.

Publication Year 2016
Title Invariant polar bear habitat selection during a period of sea ice loss
DOI 10.1098/rspb.2016.0380
Authors Ryan H. Wilson, Eric V. Regehr, Karyn D. Rode, Michelle St. Martin
Publication Type Article
Publication Subtype Journal Article
Series Title Proceedings of the Royal Society B: Biological Sciences
Index ID 70185041
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center Biology MFEB