Washington Polar bears are one of natures ultimate survivors, able to live and thrive in one of the worlds harshest environments, but we are concerned the polar bears habitat may literally be melting, Secretary of the Interior Dirk Kempthorne said on introducing a proposal in December 2006 to list the bears as an endangered species.
His plan allows a year for data review by the U.S. Fish and Wildlife Service to broaden our understanding of what is happening with the species, before a final determination on whether to list the bear as endangered.
New data demonstrating high rates of melting ice over the past several years have alarmed scientists. A recent study by Colorado-based National Center for Atmospheric Research (NCAR) shows that the Arctic Ocean could lose nearly all of its summertime ice by 2040. That could spell doom for polar bears.
We have already witnessed major losses in sea ice, but our research suggests that the decrease over the next few decades could be far more dramatic than anything that has happened so far, NCAR scientist Marika Holland said.
Bear populations that increased after restrictions on hunting in their range countries are now again in decline, the Polar Bear Specialist Group reported in 2005. The number of polar bears in the wild now is estimated at 20,000 to 25,000.
Warming affects polar bears more than other species because they live on the disappearing ice, a habitat to which they are specifically adapted. Environmental toxins also take their toll. Polar bears are at the top of the food chain, so they integrate all the changes that take place in species below them, says Steven C. Amstrup, polar bear project leader at the U.S. Geological Survey (USGS) Alaska Science Center in Anchorage.
Amstrup, who has researched polar bears for nearly 30 years, told USINFO: As far as rescuing polar bears before their habitat disappears, there is really no rescue. As sea ice declines, he said, so does their capacity to hunt for their primary food, the ring seal. Polar bears are entirely dependent upon the sea ice because it is only from that platform that they are able to harvest the bounty from the sea, Amstrup said.