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| Central Mixed-Grass Prairie ecoregion | |
|---|---|
| Name | Central Mixed-Grass Prairie |
| Biome | Temperate grasslands, savannas, and shrublands |
| Countries | United States, Canada |
| States | North Dakota, South Dakota, Nebraska, Kansas, Montana, Wyoming, Manitoba, Saskatchewan |
Central Mixed-Grass Prairie ecoregion The Central Mixed-Grass Prairie ecoregion occupies an intermediate zone between tallgrass and shortgrass provinces on the North American Great Plains, encompassing portions of North Dakota, South Dakota, Nebraska, Kansas, Montana, Wyoming, Manitoba, and Saskatchewan. Historically traversed by Indigenous nations such as the Lakota people, Dakota people, Sisseton-Wahpeton, Sault Ste. Marie Tribe of Chippewa Indians and the Blackfoot Confederacy, the region has been a focal area for exploration by figures like Lewis and Clark Expedition and settlement patterns shaped by the Homestead Act and the expansion of the Union Pacific Railroad. Contemporary management involves agencies including the United States Fish and Wildlife Service, Environment and Climate Change Canada, and state departments like the North Dakota Game and Fish Department.
The ecoregion is bounded to the east by the Missouri River valley and the historic tallgrass areas near the Mississippi River headwaters, to the west by the shortgrass steppe adjacent to the Rocky Mountains, and to the north by the boreal transition near Lake Winnipegosis and the Saskatchewan River. Major drainage systems include tributaries of the Missouri River, the James River (Dakotas), and the Red River of the North, and physiography features glacial till plains, sand prairies, and coulees associated with Pleistocene glaciation driven by events studied by researchers at institutions like the Smithsonian Institution and Geological Survey of Canada. Key municipalities and urban centers bordering the zone include Bismarck, North Dakota, Sioux Falls, South Dakota, and Grand Forks, North Dakota.
Climate is continental with marked seasonal extremes influenced by the Jet Stream and continental air masses analyzed in studies by the National Oceanic and Atmospheric Administration and the Intergovernmental Panel on Climate Change. Precipitation gradients range roughly 300–600 mm annually, producing a mosaic of mesic and xeric microsites; mean annual temperatures vary from subzero winter averages in Fargo, North Dakota to warmer conditions near Hays, Kansas. Soils are typically Mollisols formed under grassland vegetation, with loess deposits and paleosol sequences documented in research from the United States Department of Agriculture and the Canadian Soil Survey. Droughts recorded in historical climatology linked to events like the Dust Bowl shaped soil erosion and irrigation responses supervised under policies such as the Soil Conservation Service programs.
Vegetation is a heterogenous mix of mid-height grasses such as Andropogon gerardii (big bluestem), Sorghastrum nutans (Indian grass), Pascopyrum smithii (western wheatgrass), and Bouteloua gracilis (blue grama), interspersed with forbs including species studied by botanists at the Missouri Botanical Garden and the Royal Botanic Gardens, Kew. Faunal communities historically included large grazers and keystone species such as Bison bison (American bison), which were central to subsistence and cultures of nations like the Oglala Sioux Tribe and Crow Nation. Predators and mesopredators include Canis latrans (coyote) and Urocyon cinereoargenteus (gray fox), while avifauna features migratory gamebirds and songbirds monitored by organizations such as the Audubon Society and Bird Studies Canada. Amphibian and insect assemblages—including pollinators studied by researchers at Iowa State University and University of Manitoba—contribute to ecosystem services and seasonal phenology.
Indigenous stewardship involved controlled burning, bison hunting, and plant management practices integral to lifeways of groups including the Cheyenne and Arikara. European-American incursions accelerated after expeditions like Lewis and Clark Expedition and policies such as the Homestead Act promoted settlement; conflicts and treaties including the Treaty of Fort Laramie (1851) reshaped land tenure. Ranching innovations linked to figures like Charles Goodnight and railroad expansion by companies such as the Great Northern Railway altered grazing regimes and access, while 20th-century federal programs including the Civilian Conservation Corps and Soil Conservation Service sought to mitigate ecological degradation.
Current land use is dominated by mixed farming and ranching operations producing wheat, corn, sorghum, and cattle, governed by market forces tied to institutions like the United States Department of Agriculture and the Canadian Wheat Board legacy discussions. Conversion to cropland accelerated with mechanization from entities including John Deere manufacturing and agribusiness consolidation involving corporations such as Cargill and Archer Daniels Midland Company. Irrigation infrastructure, biofuel feedstock production, and conservation set-asides under programs like the Conservation Reserve Program affect landscape composition, while paleobotanical and agronomic research at universities including Kansas State University informs soil management and crop rotations.
Primary threats include habitat conversion, invasive species documented by the Invasive Species Centre, altered fire regimes suppressed by land management practices, and climate change projections from the Intergovernmental Panel on Climate Change that predict increased drought frequency. Conservation initiatives involve collaborations among the Nature Conservancy, World Wildlife Fund, provincial parks such as Grasslands National Park, and state wildlife refuges like Tewaukon National Wildlife Refuge aiming to restore native prairie, reconnect fragmented habitats, and reintroduce keystone species. Policy instruments include endangered species listings under the Endangered Species Act and provincial statutes in Saskatchewan that influence land protection.
Ongoing research programs are run by institutions such as the United States Geological Survey, University of Nebraska-Lincoln, North Dakota State University, and federal agencies like the Canadian Wildlife Service. Long-term monitoring networks—examples include the National Ecological Observatory Network and regional prairie remnants surveyed by the Prairie Restoration Group—track vegetation change, carbon sequestration, and wildlife populations. Collaborative projects with Indigenous governments and nongovernmental organizations employ remote sensing from platforms like Landsat and field experiments published in journals including Ecology and Journal of Applied Ecology to inform adaptive management and restoration practice.
Category:Prairies of North America