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

Proceedings of the Royal Society B: Biological Sciences
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Abstract

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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Invariant polar bear habitat selection during a period of sea ice loss
Series title Proceedings of the Royal Society B: Biological Sciences
DOI 10.1098/rspb.2016.0380
Volume 283
Issue 1836
Year Published 2016
Language English
Publisher Royal Society Publishing
Contributing office(s) Alaska Science Center Biology MFEB
Description Article 20160380