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There are more lowland oaks in Ecoregion 73b than in Ecoregions 73a and 73d. The ecoregion covers 1,418 square miles (3,670 km 2) within Arkansas, Mississippi, and Tennessee, with 78% in Mississippi, and the remainder roughly split between the remaining two states. [2] Protected areas within the region include the Tallahatchie NWR in Mississippi.
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.
The North American Mississippi Valley Loess Plains are a Level III ecoregion designated by the Environmental Protection Agency (EPA) in six U.S. states. The region lies primarily on the eastern border of the Mississippi Alluvial Plain , from the Ohio River in western Kentucky, through Tennessee and Mississippi, to Louisiana.
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WWF freshwater ecoregions which overlap the Southeastern Plains are Temperate upland rivers – Tennessee (152); Temperate floodplain rivers and wetlands – Lower Mississippi (149), Mobile Bay (153), and Apalachicola (155); Temperate coastal rivers – West Florida Gulf (154), Appalachian Piedmont (157), and Chesapeake Bay (158); Tropical and ...
Alaska is the most biodiverse state with 15 ecoregions across three biomes in the same realm. California comes in a close second with 13 ecoregions across four biomes in the same realm. By contrast, Rhode Island is the least biodiverse with just one ecoregion—the Northeastern coastal forests —encompassing the entire state.
The Mississippi lowland forests are a temperate broadleaf and mixed forest ecoregion in the eastern United States, covering an area of 112,300 km 2 (43,400 sq mi). [ 2 ] Setting
The level III ecoregions in Arkansas are the South Central Plains (35), Ouachita Mountains (36), Arkansas Valley (37), Boston Mountains (38), Ozark Highlands (39), Mississippi Alluvial Plain (73), Mississippi Valley Loess Plains (74). (Compare to map of Level IV ecoregions.)