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Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.
Rank State, district or territory Percent forest (2016) [2] [note 1]1 Maine 89.46% 2 New Hampshire 84.32% 3 American Samoa 80.84% 4 Northern Mariana Islands 80.37% 5 West Virginia
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
All but two Great Lakes states – Illinois and Pennsylvania – ranked in the top ten for states most at risk for biodiversity losses from climate change. A wetland area in Prentice Park, just ...
It has been estimated that before European settlement, forests in the United States mainland covered nearly 1 billion acres (4,000,000 km 2). [1] Since the mid-1600s, about 300 million acres (1,200,000 km 2 ) of forest have been cleared, primarily for agriculture during the 19th century.
Wood-Tikchik State Park in Alaska is the largest state park by the amount of contiguous protected land; it is larger than many U.S. National Parks, with some 1,600,000 acres (650,000 ha), making it larger than the state of Delaware. Many states also operate game and recreation areas.
The NatureServe conservation status system, maintained and presented by NatureServe in cooperation with the Natural Heritage Network, was developed in the United States in the 1980s by The Nature Conservancy (TNC) as a means for ranking or categorizing the relative imperilment of species of plants, animals, or other organisms, as well as natural ecological communities, on the global, national ...
United States Forest Service (USFS) United States Fish and Wildlife Service (FWS) Bureau of Land Management (BLM) These wilderness areas cover about 4.5% of the United States' land area, an area larger than the state of California. About 52% of the wilderness area is in Alaska, with 57,425,569 acres (89,727.452 sq mi; 232,393.03 km 2) of ...