Polar bears are likely to lose out to grizzly bears in fierce competition for food as climate change drives the two species closer together into shared habitat, biologists concluded in a study.
The research was based on 3-D computer modeling that compared the skull and jaw strength of the two bruins and found polar bears ill-suited to the tougher chewing demands posed by the largely vegetarian diet of their grizzly cousins.
This is one additional piece of evidence that things look pretty bleak for the polar bear, if current trends continue, said Graham Slater, the lead author of the research. Polar bears already are losing habitat as rising Arctic temperatures diminish the sea ice they depend on to hunt for seals.
As the ice continues to shrink, polar bears will be forced to seek additional food sources. To people who say polar bears can just change their diet, we are saying … they will have to, but it probably will not be sufficient for them, especially if they are co-existing with grizzly bears, said Blair Van Valkenburgh, senior author of the paper.