Loss of sea ice means it may be time to start feeding the bears: scientists
A polar bear mother and her two cubs walk along the shore of Hudson Bay near Churchill, Man., Nov. 7, 2007. (THE CANADIAN PRESS / Jonathan Hayward)
Published Tuesday, February 12, 2013 4:15PM EST
Last Updated Tuesday, February 12, 2013 4:55PM EST
EDMONTON -- Several top polar bear scientists are considering what might once have seemed unthinkable: please feed the bears.
As sea ice disappears and habitat deteriorates in some polar bear ranges, a newly published paper by 12 of the world's foremost experts suggests it's time to consider how to manage increasingly troubled populations.
One idea? Setting out big piles of polar bear chow on the tundra.
"We just raise it as one of the options," said co-author Andrew Derocher of the University of Alberta.
The study points to the bears around Hudson Bay, one of the most southerly populations and perhaps the most vulnerable to the loss of sea ice, which the animals use as a hunting platform.
A recent government of Nunavut aerial survey suggested bear numbers around the bay are stable, but other studies disagree. They suggest the bears' condition is deteriorating and they aren't producing anywhere near enough cubs.
That makes them highly vulnerable to one bad year, says Derocher's report.
"Annual variability in sea ice makes it increasingly likely that we will soon see a year where sea ice availability for some polar bear populations is below thresholds for vital rates. Malnutrition at previously unobserved scales may result in catastrophic population declines."
How will wildlife managers -- and the public -- respond to images of dozens of dying polar bears in a world where Russian icebreakers detour to save whales? Derocher asks.
"A stranded sea lion ends up in a recovery facility, fed back up and put back out," he said. "What is it about the Arctic? Is it just too far away for people to care? I don't think so."
The authors suggest tough decisions will have to be made as marginal polar bear ranges decline.
Feeding the bears is only one possible response. Bears could be relocated, temporarily housed until sea ice recovers or culled to bring numbers down to what the environment can support.
"It's going to be extremely messy as these populations move toward local extinction," Derocher said. "I think there's an expectation from the public that we've done all this research, (so) are we going to be prepared when something happens?"
Feeding animals is not unknown. Wildlife managers in central Europe put out food for wild bears. In California, carcasses are set out for condors.
It would not, however, be cheap.
Using figures derived from zoos that keep polar bears, the paper calculates that it could cost nearly $1 million a month to distribute commercial bear chow to the southern Hudson Bay bears.
All management tools bring their own problems. Feeding sites could create vectors for disease or parasites. Ending a feeding program could create more bear-human conflicts.
Derocher said the paper is intended to put the issue before the public. He said the discussion should involve a wide array of participants, including hunters, scientists, Inuit, tourism operators, environmental groups and the general public.
"It's a societal decision."
But a decision is coming.
"The changes are coming a lot faster that we thought," said Derocher. "We're seeing clear indications that populations are getting close to the tipping point."