Bears will see varied influence of changing distribution of trees.
For example, although the implications may not be perfectly clear,
polar bears will be shifting southward off the ice and onto the land
at the same time that spruce will be shifting northward, plausibly
shading the ground enough to select for or against the understory
species that might be polar bears’ future food base.
Lance
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http://www.sciencedaily.com/releases/2007/12/071203090131.htm
Climate Change Predicted To Drive Trees Northward
ScienceDaily (Dec. 3, 2007) – The most extensive and detailed study
to date of 130 North American tree species concludes that expected
climate change this century could shift their ranges northward by
hundreds of kilometers and shrink the ranges by more than half. The
study is by Daniel W. McKenney of the Canadian Forest Service and his
colleagues. Ranges may decrease sharply if trees cannot disperse in
altered conditions.