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DNA测试出野外原产混血熊

2006-05-16 08:34王高山,CRI

DNA Test Confirms Hybrid Bear in the Wild

Hybrid Bear in the WildA DNA test has confirmed what zoologists, hunters and aboriginal trackers in the far northern reaches of Canada have dreamed of for years: the first documented case of a grizzly-polar bear in the wild.

Roger Kuptana, an Inuit tracker from the Northwest Territories, suspected the American hunter he was guiding had shot a hybrid bear after noticing its white fur was spotted brown and it had the long claws and slightly humped back of a grizzly.

Territorial officials seized the bear's body and a DNA test from Wildlife Genetics International, a lab in British Columbia, confirmed the hybrid was born of a polar bear mother and grizzly father.

"It's something we've all known was theoretically possible because their habitats overlap a little bit and their breeding seasons overlap a little bit," said Ian Stirling, a biologist with the Canadian Wildlife Service in Edmonton, Alberta. "It's the first time it's known to have happened in the wild."

Stirling said polar bears and grizzlies have been successfully paired in zoos and that their offspring are fertile, but there had been no documented case in the wild.

That might explain how a grizzly got to the region, but few can explain how it managed to get along with a polar bear long enough to mate.


在野生环境中能见到北极熊和灰熊的混血儿吗?对于这个问题的可能性,生活在加拿大北部地区的猎人、科学家和那些极具想象力的人们已经讨论了数年之久。在加拿大西北地区的班克斯岛,伴随着一次打猎活动和随后进行的DNA检测,这种猜测最终变成了现实。

据美联社5月10日报道,罗杰·卡普塔纳是这次打猎活动的向导,他来自来加拿大西北地区的萨克斯港。卡普塔纳说,在上个月进行的这次打猎活动中,一名美国猎人射中的一只“北极熊”看起来样子怪怪的。当时他猜测,这只熊可能就是北极熊和灰熊生出的混血儿。

这只熊白色的毛中还搀杂有棕色的斑纹,它还长有像灰熊一样的长爪子和隆起的背部。在注意到这只熊与众不同的样子之后,当地有关部门的官员对其进行了DNA检测。检测结果表明,它确确实实具有双重血统,它的妈妈是一只北极熊,而它的爸爸则是一只大灰熊。

这可能是野生环境中第一只被证实的北极熊和灰熊生的混血儿。对此,加拿大野生动物保护局的北极熊研究专家伊恩·斯特灵说:“我们一直认为这是可能发生的事情,但是事实上,我们中的大多数人从没想过它会真的发生。”

报道说,此前,北极熊和灰熊曾在动物园内被配对成功,而且它们还生下了后代。北极熊和灰熊这两种不同种类的熊,其繁殖期大致相同,但相比较而言,北极熊的繁殖期要比灰熊来得稍稍早一些。

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