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| Eastern Tallgrass Prairie | |
|---|---|
| Name | Eastern Tallgrass Prairie |
| Biome | Temperate grasslands, savannas, and shrublands |
| Ecozone | Nearctic |
| Countries | United States |
| States | Illinois; Iowa; Minnesota; Missouri; Nebraska; Kansas; Wisconsin; Indiana; Ohio |
| Conservation | Critically endangered |
Eastern Tallgrass Prairie The Eastern Tallgrass Prairie is a Nearctic ecoregion of temperate grassland historically spanning parts of the Midwestern United States across the Mississippi River watershed and adjacent plains. Once a dominant vegetation type across Illinois, Iowa, Minnesota, Missouri, Kansas, Nebraska, Wisconsin, Indiana, and Ohio, the prairie supported complex interactions among Native American nations, European settlers, and agency institutions during periods of expansion and policy change. Today the landscape is largely fragmented among protected areas, private preserves, and agricultural matrices managed by a mixture of federal, state, and non‑profit organizations.
The ecoregion historically extended from the western edge of the Great Lakes basin down to the Ozark Plateau and west into the Missouri River valley, encompassing tallgrass dominated communities such as big bluestem and switchgrass dominated swards near riverine systems like the Illinois River, Des Moines River, and Wabash River. Remnant tracts occur within national and state preserves including the Midewin National Tallgrass Prairie, Nachusa Grasslands, Konza Prairie Biological Station, and smaller sites managed by organizations such as the Nature Conservancy and the Audubon Society. The spatial pattern reflects historical land surveys, Homestead Act settlement, railroad expansion such as the Chicago, Burlington and Quincy Railroad corridors, and subsequent conversion to row crops like maize and soybeans promoted by agricultural policies including the Federal Farm Loan Act.
Underlying geology includes deposits from the Wisconsin Glaciation and older Pleistocene glacial episodes, with loess mantles derived from Missouri River floodplains and alluvial terraces. Predominant soils are deep mollisols formed under grassland vegetation, with high organic matter and granular structure supporting root networks of species such as Andropogon gerardii and Panicum virgatum. Hydrologic regimes are shaped by tributaries to the Mississippi River, groundwater flow in aquifers like the High Plains Aquifer, and wetlands associated with prairie potholes influenced by the Laurentide Ice Sheet legacy. Soil drainage classes and tile drainage installations linked to irrigation and drainage practices implemented after the Drainage Act have altered surface and subsurface hydrology.
The climate is continental, with continentality moderated by proximity to the Great Lakes and prevailing westerlies; precipitation gradients decrease from east to west across the ecoregion, with influences from synoptic systems such as the Aleutian Low and Gulf of Mexico moisture fluxes. Historic disturbance regimes were dominated by frequent surface fire set by Indigenous practitioners associated with nations like the Potawatomi, Ho-Chunk, Ojibwe, and later by lightning ignitions, creating a fire return interval that maintained tallgrass dominance and suppressed woody encroachment. Fire management became contentious during the 19th and 20th centuries with policies from agencies including the United States Forest Service and the Bureau of Land Management before contemporary prescribed burning protocols adopted by research stations and NGOs.
Vegetation was characterized by a dominance of C4 bunchgrasses such as Andropogon gerardii (big bluestem), Sorghastrum nutans (Indian grass), and Panicum virgatum (switchgrass), with diverse forb assemblages including species like Eryngium yuccifolium (rattlesnake master) and prairie forbs attracting pollinators managed in conservation plans by organizations like the Xerces Society. Faunal communities included grassland obligates such as the Greater Prairie-Chicken, Henslow's Sparrow, and migratory species using flyways connected to wetlands like Sand Prairie Wetland complexes; large mammals historically present included Bison and predators such as Gray Wolf prior to extirpation driven by market hunting, land conversion, and state bounty systems. Aquatic and wetland organisms persisted in oxbows, potholes, and spring-fed marshes providing habitat for Amphibian assemblages studied by university programs including Kansas State University and University of Illinois Urbana-Champaign.
Indigenous stewardship across the region involved rotational burning, hunting practices, and plant management by nations such as the Illinois Confederation, Miami, Sac and Fox, and Sioux, embedded within trade networks connected to European powers like France and later the United States following treaties including the Treaty of Chicago. Euro-American settlement intensified under legislation such as the Land Ordinance of 1785 and the Missouri Compromise era expansion, leading to plowing with technologies like the steel plow of John Deere and mechanized agriculture during the Industrial Revolution and Great Depression when New Deal programs reshaped land tenure and conservation thinking via agencies like the Soil Conservation Service.
Conversion to agriculture, urbanization around metropolitan areas such as Chicago, St. Louis, and Minneapolis–Saint Paul, and infrastructure development including the Interstate Highway System and river channelization projects degraded continuity of prairie habitats. Fragmentation metrics derived by conservation biologists and landscape ecologists show severe reduction of contiguous prairie to small remnant parcels, with many populations listed under legislation like the Endangered Species Act for associated fauna and flora. Conservation status assessments by entities such as the World Wildlife Fund and state natural heritage programs classify the ecoregion as critically endangered, prompting regional conservation partnerships including the Prairie Plains Resource Institute and multi-state initiatives.
Restoration employs tools including prescribed fire regimes coordinated with agencies such as the National Park Service and research institutions like Kansas State University and Kansas Biological Survey, invasive species control targeting taxa such as Centaurea stoebe and Phalaris arundinacea, native seed sourcing guided by genecology research from universities like the University of Minnesota, and reintroduction projects for species such as Bison coordinated with conservation NGOs and tribal partners including the Ho-Chunk Nation. Adaptive management integrates monitoring protocols using long-term research sites like the Konza Prairie Biological Station and citizen science contributions from groups such as The Nature Conservancy chapters, while policy instruments include conservation easements, programs under the Farm Bill, and land trust acquisitions to increase connectivity among remnants.