黑足雪貂濒临灭绝原因英文4

草原犬鼠对牧场有一定的破坏作用，因此遭到了牧场主的憎恨。为了彻底消灭草原犬鼠，牧场主们投放了大量的毒饵,定格作文。其结果是草原犬鼠的确遭到了灭顶之灾，但以草原犬鼠为主要食物来源的黑足雪貂也紧跟着遭了殃，到了1985年，全球仅剩下31只。据世界野生基金组织报告，黑足雪貂在加拿大境内早已灭绝。由于黑足雪貂夜行性和穴居的生活习性，增加了对其进行进一步研究的困难，但更因为人类的漠视，使得一种美丽可爱的小动物不知不觉的消失了。这都是人类根本的错啊！

Prairie dog on the ranch have some damaging effects, it was a hatred of ranchers. In order to completely eliminate prairie dog, ranchers have put a lot of t and set-piece composition. As a result, prairie dog really was a disaster, but the prairie dog as the main food source of black-footed ferrets are followed by a calamity, to 1985, leaving only 31 worldwide. According to World Wildlife Fund report, black-footed ferret, long extinct in Canada. As the black-footed ferrets, burrowing, and nocturnal habits of life, increasing the difficulties to study it further, but more because of human neglect, making a beautiful cute little animals unknowingly disappeared. This is the basic human too!

对不起啊，措施目前没有找到，望楼主见谅。

但我认为当时解决草原犬鼠时应该让雪豹来捕捉，这样就一举两得了。

But I think that was resolved when the prairie dog should be allowed to catch the snow leopard, so kill two birds with a

black-footed ferret
http://www.blackfootedferret.org/
http://www.bagheera.com/inthewild/van_anim_ferret.htm
Causes of Endangerment
Killing of Prey and Habitat Loss
Massive hunting and poisoning campaigns against the prairie dog, its main food source, caused the ferret to decline. Since the pioneers arrived on the Great Plains, ranchers and farmers have concted an extensive campaign to get rid of prairie dogs, which were considered pests.

Discovery of sylvatic plague in the colonies stepped up efforts to eliminate the prairie dogs. From 1900 to present, prairie dog populations plummeted to about 5 to 10 percent of their former numbers.

The wholesale conversion of prairie to crop land further impacted the ferrets and their prey. Just one percent of the United States' native prairie remains today (see Spotlight on the Prairie).

With patches of prairie becoming fewer and farther between, ferret habitat became increasingly fragmented. The remaining black-footed ferrets became more isolated, and unable to reproce.

Crowding wildlife into smaller islands of habitat causes inbreeding. The lowered immune responses of inbred animals increases the likelihood of epidemic disease. In 1984, an outbreak of canine distemper brought by domestic dogs and coyotes devastated the already-precarious ferret population.

By 1985, there were just 10 known black-footed ferrets in the wild.

Conservation Actions
Protection Under the Law
The black-footed ferret was first officially recognized by the United States government as threatened in 1967 and was listed as endangered when the Endangered Species Act (ESA) was created in 1973. By the time the United States Fish and Wildlife Service adopted a recovery plan for habitat protection in 1978, however, the ferret had declined to near extinction. The recovery plan has since been modified with emphasis on captive breeding and reintroction.

Captive Breeding and Reintroction
The Wyoming Department of Game and Fish coordinates the Species Survival Plan (SSP) for black-footed ferrets. Captive breeding populations are maintained at the Sybille Wildlife Research Station in Wyoming and several zoos.

After the black-footed ferret population was decimated by disease, biologists determined that the remaining wild ferrets were not a viable breeding population. The last 12 ferrets were captured and combined with 6 ferrets already in captivity to bring the world total to 18 ferrets, all in captivity, in 1987.

Captive breeding has been successful.

Sufficient numbers of prairie dogs were born to allow reintroction to be attempted after just a few years. In 1991, the first reintroction of 49 juvenile ferrets was completed. Careful monitoring showed that 12 percent of these ferrets were able to survive the winter. The discovery of two wild-born litters was a particularly good sign. A second group of 90 captive-bred ferrets was released in 1992.

Follow-up indicates that survival may be about 25 percent. The majority of ferrets are lost to predation by coyotes. The objective of the recovery effort is to establish ten geographically distinct free-ranging populations totalling 1,500 ferrets by the year 2010.

Obviously, black-footed ferret reintroction will be successful only if there are sufficient numbers of prairie dogs to support the ferrets. Efforts are being made to preserve habitat and rece other pressures on prairie dogs.

This is a prime example where saving one species means saving a whole ecosystem: the praire dog colonies are a complex natural system supporting many other species besides the black-footed ferret, including birds, mammals, reptiles, insects, and even plants.

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