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Coasts and Intertidal Zones. Deciduous Forests. Great Plains. Greater Everglades. Northwest Florida. Rocky Mountains. Sagebrush Sea. Sky Islands. Southern Appalachians. The grizzly was eliminated from much of the west by the late 's. As mountainous areas were settled, development contributed to an increase in human-caused mortality.
Livestock depredation control, habitat deterioration, commercial trapping, unregulated hunting and the perception that grizzlies threatened human life were leading causes of the animal's decline. The U. Fish and Wildlife Service listed the grizzly bear as a threatened species under the Endangered Species Act in , meaning it is considered likely to become endangered "endangered" means a species is considered in danger of extinction within all or a significant portion of its range.
The degradation of habitat due to rural or recreational development, road building, and energy and mineral exploration is one of the many of the current threats to the survival of grizzly bears.
Habitat destruction in valley bottoms and riparian areas is particularly harmful to grizzlies because they use these "corridors" to travel from one area to another when they are searching for food. Some private landowners and companies are trying to help grizzlies by voluntarily protecting grizzly corridors.
Life Span: In nature, Grizzly Bears have an expected lifespan of around years. Size: Adult females have masses between kg, and fully grown males range between kg. Population estimate: The Canadian population of Grizzly Bears is estimated to be around 26,, but the number of mature Grizzlies could be closer to 10, In Canada, though historical records are lacking, the population of Grizzlies is suspected to have declined dramatically as a result of European settlement.
As a case in point, the species has been completely extirpated from its former ranges in the interior of southern British Columbia, the prairies of Alberta, Saskatchewan and Manitoba, and the Ungava region of Labrador and northern Quebec. While the range of the species has expanded in some areas, and the total population has appeared to have stabilized since the s, there is evidence of further population declines in southern BC, the Yukon and Alberta. Population fragmentation has also put entire local populations at risk.
Anthropogenic activities have had a large effect on the Grizzly Bear population. Direct human-incurred deaths are caused by legal hunting, poaching, defense of life and property, and collisions with trains or motor-vehicles.
Humans also have greatly limited habitable range available to the bears, causing great habitat losses. In addition to causing higher mortality rates near roads and residential areas, human settlement has been believed to fragment and isolate existing Grizzly Bear populations.
One of the major ways in which Grizzly Bears are currently protected is through hunting regulations.
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