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Dołączył: 12 Mar 2011
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Wysłany: Śro 11:51, 18 Maj 2011 |
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The Five Bears of Europe and Asia
Arctic Oil Drilling and Spills one Added Threat apt Polar Bears
The Plight of the Polar Bear and the Environment
Brown Bear (Ursus arctos)
This dark bears historic scope covered most of Canada, the US and northern Mexico. Although it has been extirpated from some areas, present population namely estimated by 850,[link widoczny dla zalogowanych],000 to 950,000. This population is healthy merely threats to the category include habitat wastage with the resultant latent for collide with humans and, more recently, poaching for the Traditional Chinese Medicine trade. It is listed as Least Concern at the IUCN
The brown bear inhabits many of the northern hemisphere international. In the New World it ranges throughout the western parts of Canada and the US with healthy populations in Alaska. Some populations of the grizzly bear (Ursus artos horribilis) subspecies are listed as Threatened beneath the Endangered Species Act but the majority of brown bears are considered Least Concern. The coastal brown bear found in the US and Canada is closely narrated to the grizzly and interbreeding among the subspecies does occur.
American Black Bear (Ursus americanus)
The merely living species of bear in South America, the Spectacled bear is considered Vulnerable by the IUCN. It is found from Venezuela to Argentina along the Andean Mountain range. There may be a few remaining Spectacled bears in Panama as well. Like its North American comparative, this Andean bear is intimidated by habitat loss and poaching. But their habitat is much more shredded and numerous populations of Spectacled bear are isolated so the species is anticipated to decline by more than 30% within the afterward 3 generations. There are not nice estimates of absolute population but there may be as few as 10,[link widoczny dla zalogowanych],000 Spectacled bears left in warmhearted separated populations.
Polar Bear (Ursus maritimus)
In the New World there are 4 species of bear, three in the northern hemisphere and 1 in the southern hemisphere. All are facing habitat loss and fragmentation as human populations boost. In North America, trade in bear gall bladders and claws has caused an addition in poaching, primarily for the black bear. In South USA, distending farming is creating habitat loss which results in collide with humans for the spectacled bear.
The polar bear inhabits the circumpolar arctic of Canada and Alaska. It has recently transform the converge of concern as weather change is seriously affecting its habitat. The sea ice they rely on is projected to reduce as many as 50% by 2100. Polar bears are too highly susceptible to exposure to toxic contaminants, such as those released during oil and gas exploration. With a 15 min of their subpopulations declining and different quarter more with not enough message to appraise their status, this bear is back ashore the IUCN Vulnerable menu. The US Fish and Wildlife Service has likewise intended that the polar bear be listed as Threatened under the Endangered Species Act.
Spectacled alternatively Andean Bear (Tremarctos ornatus)
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