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1 A Canadian Wildlife Service study, by polar bear scientists Ian Stirling, Nicholas J. Lunn and John Iacozza, found that the bears' main food source, ringed seals which live on the ice of Hudson Bay, are becoming less accessible because of a shorter ice season.
Building on a past NASA study which found a 2.9 percent decline per decade in total Arctic sea ice extent over the last 20 years, the new Canadian study further concludes that the sea ice season in western Hudson Bay has been reduced by about three weeks over the same period.
The study says that, as a result of the reduction in sea ice, polar bears have less time to hunt and are returning to land in poorer condition. Weight for both male and female polar bears is declining and female bears are having fewer cubs. Although significant population decline has not yet begun, this is inevitable if the trends continue.
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