Greater Yellowstone Ecosystem

The Greater Yellowstone Ecosystem is one of the last remaining large, nearly intact ecosystems in the northern temperate zone of the Earth. It is partly in Yellowstone National Park. 
280px|right|thumb|Bison grazing near Gibbon River at Madison in Yellowstone National Park

The Greater Yellow Ecosystem (GYE) is a kind of natural laboratory in landscape ecology and geology. It is a world-renowned recreational site, and home to the animals of Yellowstone.

History
The Yellowstone National Park boundaries were drawn in 1872 to include all the geothermal basins in the area. By the 1970s, the grizzly bear's (Ursus arctos) range in and near the park became the unofficial minimum boundary of a Greater Yellowstone ecosystem. This had at least . Since then, definitions of the greater ecosystem's size have steadily grown larger. A 1994 study listed the size as , while a 1994 speech by a Greater Yellowstone Coalition leader enlarged that to .

In 1985 the United States House of Representatives Subcommittees on Public Lands and National Parks and Recreation held a joint subcommittee hearing on Greater Yellowstone. The result was a 1986 report by the Congressional Research Service which said that different agencies were not working well together, and the area's essential values were at risk.

There are other areas within the Greater Yellowstone area which are managed by federal authorities. They include the Gallatin, Custer, Caribou-Targhee, Bridger-Teton and Shoshone National Forests, the John D. Rockefeller, Jr. Memorial Parkway, the National Elk Refuge and Grand Teton National Park. The GYE also includes some private lands around those managed by the U.S. Government. 

Outside of Yellowstone National Park, ten wilderness areas have been established in the National Forests since 1966 to get more habitat protection than usual.

 References 

Category:Biosphere reserves
Category:Calderas
Category:Ecosystems
Category:Animals of North America
Category:National parks in the United States
Category:Volcanoes of the United States
Category:Wilderness Areas of the United States
Category:Geography of Idaho
Category:Geography of Montana
Category:Geography of Wyoming