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Melting ice pack displaces Alaska walrus Thousands of walrus（海象） 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 walrus, 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. Walrus feed on clams, snails and other bottom dwellers（生物）. Given the choice between an ice platform over water beyond their 630-foot diving range or gathering spots on shore, thousands of walrus picked Alaska's rocky beaches. "It looks to me like animals are shifting their distribution to find prey（食物）," 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 walrus abandoned the ice pack for gathering spots known as haulouts between Barrow and Cape Lisburne, a 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（象群）rushing to the sea. Young animals can be crushed by adults weighing 2,000 pounds or more. Longer term, biologists fear walrus will suffer nutritional stress if they are concentrated on shoreline rather than spread over thousands of miles of sea ice. Walrus need either ice or land to rest. Unlike seals, they cannot swim indefinitely and must pause after foraging（捕食）.
Melting冰袋偏移阿拉斯加海象 walrus（海象） Thousands在什么的阿拉斯加的西北海岸出现环保专家称熔化北极海冰的全球性变暖的一种剧烈的后果。 Alaska海象，特别是繁殖的女性，在夏天和秋天在北极冰袋通常被找到。 但是在纪录的最低的夏天冰冠在白令和Chukchi海投入了外面大陆架，海底浅，富有生活的架子的海冰远北部。
在蛤蜊、蜗牛和其他水底栖息物（生物）的Walrus饲料。 假使在冰平台在水在他们的630英尺潜水范围之外或汇聚斑点之间的选择在岸，数以万计海象采摘了阿拉斯加的多岩石的海滩。 它看给我的 "，如动物转移他们的发行发现prey（食物）， “说Tim Ragen，联邦海洋哺乳动物委员会的执行董事。
“大问题是他们是否能发现充足的牺牲者在他们看的区域”。 根据全国雪和冰数据中心的在科罗拉多大学在巨石城， 9月海冰是39%在从1979年的长期平均之下到2000年。 海冰盖子在一个向下螺旋，并且也许通过了临界点，与可能的无冰的北冰洋在夏天之前2030年，资深科学家标记Serreze说。
Starting在7月，数千海象放弃了会集的叫作在手推车和海角Lisburne， 300英里舒展之间的haulouts的斑点冰袋阿拉斯加海岸线。 新，大海象小组The直接关心美国鱼类野生物保护部的是危险对从惊逃的动物。 一架低空飞行的飞机、小船或者一头接近的北极熊造成的恐慌可能送herd（象群）rushing到海。
幼小动物可以由称2,000磅或更多的成人击碎。 如果他们被集中海岸线而不是被延长的数以万计英里海冰， 较长期，生物学家恐惧海象将遭受营养重音。 Walrus休息的需要冰或土地。 不同于封印，他们不无限地游泳并且必须在foraging（捕食）以后停留。
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