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Wonderfully Adapted. In the Arctic, temperatures can plunge to -40° or -46 C (-50 F) in winter and stay that way for days or weeks. But polar bears are built for those conditions. From fur to skin, to paws and claws, the sea bear’s physique is designed to protect them from the cold, hunt seals, and dominate the Arctic.
Abstract. Polar bears (Ursus maritimus) face extremely cold temperatures and periods of fasting, which might result in more severe energetic challenges than those experienced by their sister species, the brown bear (U. arctos).We have examined the mitochondrial and nuclear genomes of polar and brown bears to investigate whether polar bears demonstrate lineage-specific signals of molecular ...
2 lut 2018 · Evolution of this Arctic apex predator included behavioral and physiological adaptations that distinguish polar bears from terrestrial bears , which has made them dependent on the sea ice and may increase their vulnerability to climate change .
8 maj 2014 · Strong selection in genes related to fatty acid metabolism, pigmentation, and cardiovascular function are found in the polar bear genome, reflecting the unique adaptations of polar bears to the extreme High Arctic compared to brown bears.
How do polar bears survive their Arctic habitat? Is climate change affecting their population? Learn how polar bears have adapted to life on top of the world.
6 sie 2020 · Polar bears are uniquely adapted to an Arctic existence. Since their relatively recent divergence from their closest living relative, brown bears, less than 500,000 years ago, the species has evolved an array of novel traits suited to its Arctic lifestyle.
13 lut 2024 · Declining Arctic sea ice is increasing polar bear land use. Polar bears on land are thought to minimize activity to conserve energy. Here, we measure the daily energy expenditure (DEE),...
