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Archive for Sunday, October 7, 2007

Walruses on Alaskan shore alarm scientists; global warming cited

October 7, 2007

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This Sept. 28 photo provided by the North Slope Borough shows a young male walrus resting on the beach in Barrow, Alaska. Scientists and conservationists are expressing alarm at the appearance of thousands of walruses on Alaska's northwest coast, a dramatic demonstration of the effects of diminished Arctic sea ice brought on by global warming.

This Sept. 28 photo provided by the North Slope Borough shows a young male walrus resting on the beach in Barrow, Alaska. Scientists and conservationists are expressing alarm at the appearance of thousands of walruses on Alaska's northwest coast, a dramatic demonstration of the effects of diminished Arctic sea ice brought on by global warming.

— Thousands of walruses have appeared on Alaska's northwest coast in what conservationists are calling a dramatic consequence of global warming melting the Arctic sea ice.

Alaska's walruses, especially breeding females, in summer and fall are usually found on the Arctic ice pack. But the lowest summer ice cap on record put sea ice far north of the outer continental shelf, the shallow, life-rich shelf of ocean bottom in the Bering and Chukchi seas.

Walruses feed on clams, snails and other bottom dwellers. Given the choice between an ice platform over water beyond their 630-foot diving range or gathering spots on shore, thousands of walruses picked Alaska's rocky beaches.

"It looks to me like animals are shifting their distribution to find prey," said Tim Ragen, executive director of the federal Marine Mammal Commission. "The big question is whether they will be able to find sufficient prey in areas where they are looking."

According to the National Snow and Ice Data Center at the University of Colorado at Boulder, September sea ice was 39 percent below the long-term average from 1979 to 2000. Sea ice cover is in a downward spiral and may have passed the point of no return, with a possible ice-free Arctic Ocean by summer 2030, senior scientist Mark Serreze said.

Starting in July, several thousand walruses abandoned the ice pack for gathering spots known as haulouts between Barrow and Cape Lisburne, a remote, 300-mile stretch of Alaska coastline.

The immediate concern of new, massive walrus groups for the U.S. Fish and Wildlife Service is danger to the animals from stampedes. Panic caused by a low-flying airplane, a boat or an approaching polar bear can send a herd rushing to the sea. Young animals can be crushed by adults weighing 2,000 pounds or more.

Longer term, biologists fear walruses will suffer nutritional stress if they are concentrated on shoreline rather than spread over thousands of miles of sea ice.

Walruses need either ice or land to rest. Unlike seals, they cannot swim indefinitely and must pause after foraging.

Historically, Ragen said, walruses have used the edge of the ice pack like a conveyor belt. As the ice edge melts and moves north in spring and summer, sea ice gives calves a platform on which to rest while females dive to feed.

There's no conveyor belt for walrus on shore.

"If they've got to travel farther, it's going to cost more energy. That's less energy that's available for other functions," Ragen said.

Deborah Williams - who was an Interior Department special assistant for Alaska under former President Bill Clinton, and who is now president of the nonprofit Alaska Conservation Solutions - said melting of sea ice and its effects on wildlife were never even discussed during her federal service from 1995 to 2000.

"That's what's so breathtaking about this," she said. "This has all happened faster than anyone could have predicted. That's why it's so urgent action must be taken."

Walrus observers on the Russian side of the Chukchi Sea have also reported more walrus at haulouts and alerted Alaska wildlife officials to the problems with the animals being spooked and stampeded.

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