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| Central Mixed-Grass Plains | |
|---|---|
| Name | Central Mixed-Grass Plains |
| Biogeographic realm | Nearctic |
| Biome | Temperate grasslands, savannas, and shrublands |
| Countries | United States |
| States | Nebraska, Kansas, South Dakota, North Dakota, Wyoming, Colorado, Montana, Iowa |
Central Mixed-Grass Plains The Central Mixed-Grass Plains is a temperate ecoregion in the United States characterized by a mosaic of prairie, wetlands, and riparian corridors. It occupies a transitional belt between the Tallgrass Prairie and the Shortgrass Prairie, supporting diverse plant and animal assemblages and a long history of human use by Indigenous nations and European settlers.
The ecoregion spans portions of Nebraska, Kansas, South Dakota, North Dakota, Wyoming, Colorado, Montana, and Iowa, extending across the Great Plains and adjoining the Missouri River and its tributaries. Major physiographic features include the High Plains, the Dissected Till Plains, and remnants of the Glaciated Plains, with notable landmarks such as the Pawnee National Grassland, the Niobrara River, and the Republican River valleys. The area interfaces with neighboring ecoregions including the Ozark Highlands, the Western Corn Belt Plains, and the Montana Valley and Foothill Prairies.
Climate is continental with marked seasonal temperature ranges influenced by air masses from the Gulf of Mexico, the Rocky Mountains, and the Arctic. Precipitation gradients fall from east to west, with annual totals influenced by phenomena such as the El Niño–Southern Oscillation and the Pacific Decadal Oscillation. Extremes include winter cold waves associated with the Polar Vortex and severe convective storms producing tornadoes linked to the Great Plains low-level jet and systems tracked by the National Weather Service.
Vegetation comprises mixed-grass species assemblages including warm-season and cool-season bunchgrasses and forbs historically recorded by botanists such as John James Audubon and Frederick Vernon Coville. Dominant grasses include species analogous to big bluestem ranges, little bluestem distributions, and blue grama occurrences, interspersed with forbs documented in floras curated by institutions like the Smithsonian Institution and the New York Botanical Garden. Riparian corridors support assemblages of cottonwood and willow taxa observed in surveys by the U.S. Fish and Wildlife Service and the United States Geological Survey.
Faunal assemblages historically included keystone mammals such as populations comparable to historical American bison herds and megafauna inferred from Lewis and Clark Expedition accounts; contemporary fauna include ungulates like white-tailed deer and pronghorn, predators such as coyote and occasional black bear occurrences near forested edges, and avifauna including greater prairie-chicken, meadowlark species, and sandhill crane migration concentrations documented by the Audubon Society. Amphibian and reptile species mirror distributions reported by the Herpetologists' League and conservation groups like The Nature Conservancy.
Soils range from mollisols of the prairie belt to entisols on recent alluvium, mapped by the Natural Resources Conservation Service and described in manuals from the Soil Science Society of America. Groundwater systems are influenced by the Ogallala Aquifer footprint at western margins, while surface water dynamics are shaped by reservoirs such as Lake McConaughy and flood control infrastructure managed by the U.S. Army Corps of Engineers. Wetland complexes conform to classifications used by the Ramsar Convention inventories and state-level natural heritage programs.
The region contains ancestral territories of Indigenous nations including the Omaha (tribe), Ponca, Lakota Sioux, Cheyenne, and Arikara peoples who practiced hunting and prairie management, later affected by treaties such as the Treaty of Fort Laramie (1851). Euro-American settlement accelerated with Homestead Act claims and railroad expansion by companies like the Union Pacific Railroad, giving rise to agricultural conversion to crops including corn and wheat and extensive cattle ranching documented in regional histories held by the Library of Congress and state historical societies. 20th-century policies from the Soil Conservation Service responded to erosion events comparable to the Dust Bowl, while contemporary energy development includes wind farms financed by entities such as Xcel Energy and oil and gas operations regulated by state commissions.
Conservation efforts are coordinated by agencies and organizations including the U.S. Fish and Wildlife Service, The Nature Conservancy, the National Park Service at sites like Agate Fossil Beds National Monument, and state fish and wildlife agencies. Management tools include prescribed fire regimes promoted by the National Wildfire Coordinating Group, native grassland restoration guided by research from universities such as University of Nebraska–Lincoln and Kansas State University, and easement programs administered by the Natural Resources Conservation Service and the USDA Farm Service Agency. Challenges involve balancing agricultural production with habitat connectivity priorities identified by the Migratory Bird Treaty Act implementations and climate adaptation frameworks advanced by the Intergovernmental Panel on Climate Change.