<Li> United States National Park Service (NPS)--Yellowstone National Park, Grand Teton National Park, and John D. Rockefeller, Jr . Memorial Parkway . </Li> <Li> United States National Forest Service (USFS)--Gallatin, Custer, Beaverhead - Deerlodge National Forest, Caribou - Targhee, Bridger - Teton, and Shoshone National Forests </Li> <Li> United States Fish and Wildlife Service (USFWS)--National Elk Refuge, Red Rock Lakes and Grays Lake National Wildlife Refuges </Li> <P> Ten distinct National Wilderness Areas have been established within the GYE's National Forests since 1966, mandating a higher level of habitat protection than the USFS otherwise uses . </P>

What type of ecosystem is yellowstone national park