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The key danger for polar bears posed by the effects of climate change is malnutrition or starvation due to habitat loss.Polar bears hunt seals from a platform of sea ice. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.
The Western Hudson Bay polar bears are off the ice for a month longer than their parents and grandparents. That hurts their hunting and ability to have healthy cubs that make it to adulthood.
Susan Janet Crockford is a Canadian zoologist known for her research and publications on polar bears. From 2004 to 2019 she was an adjunct professor in Anthropology at the University of Victoria. [1] Crockford has gained attention for her blog posts on polar bear biology, in which she argues that polar bears are not threatened by climate change ...
As temperatures warm, and ice melts, polar bears are dying at an increasing rate. Once thriving, polar bears have become a vulnerable species with just an estimated 22,000 to 31,000 individuals ...
That said, conservationists' efforts have been largely successful. In 2017, WWF reported that "most of the world's 19 populations [of polar bears] have returned to healthy numbers." In fact, polar ...
The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed.The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb).
The 1958 Statehood Act set up a program for polar bear management, and further conservation efforts, including the 1972 Marine Mammal Protection Act, have limited polar bear hunts. [10] Polar bear populations may be threatened by oil development and global warming. [10] [11] Only about 4700 polar bears are known to inhabit Alaska. [12]
Climate change is thought to be the biggest threat facing polar bears. In the Arctic the polar bear is a top predator that is highly dependent on sea ice to hunt. The drifting ice provides access to find its most important prey – ringed seals. Population decline, changes in behaviour and a worsening physical condition are already being ...