Polar bears are a familiar sight to many through the media as we see evocative images of singular bears floating on isolated ice rafts as they face the harsh realities of climate change shrinking sea ice in the Arctic. Their range is significantly impacted by the presence of perennial sea ice—that which survives at least one summer melt season. Simulations suggest polar ice cover is predicted to disappear during summer months by 2050, meaning this apex predator is increasingly being threatened by extinction due to habitat loss.
, such as single-celled foraminifera and diatomaceous algae, suggest summer temperatures in the region were 6–10°C.
This archaeological site also offers insights into the hunter-gather human population migrating between here and the Siberian mainland, with polar bears and reindeer being a substantial component of their diet. Fossils found on Alaska's Aleutian Islands and Pribilof Islands likely represent the southernmost extent of polar bears during these considerably warmer intervals, and the researchers deduced that the surrounding Bering Sea only experienced sea ice during winter, if at all.
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