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How does the loss of Arctic sea ice affect polar bears?
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bear
Grizzly bear in Jasper National Park, western Alberta, Canada.
The loss of Arctic sea ice due to global warming poses a severe threat to the polar bear, as this ice serves as their primary habitat for hunting, traveling, and mating.12
The decline in ice coverage negatively impacts the species in several critical ways:
- Reduced Hunting Success: Polar bears rely on sea ice to stalk and ambush seals. As ice-free seasons lengthen and ice gaps widen, it becomes increasingly difficult for bears to access their prey.12
- Starvation and Health: Longer periods without ice force bears to spend more time foraging for lower-quality food sources, such as berries and seabird eggs, which require more energy to obtain. This has led to documented declines in physical condition and increased rates of starvation.13
- Reproductive Challenges: Fragmentation of sea ice reduces encounter rates between males and females, leading to a decline in mating success. Studies have also linked decreased ice cover to lower reproductive success in certain populations.13
Given these compounding pressures, model forecasts suggest that polar bear populations could decline by one-third by 2050.1