If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot. Level II divides the continent into 52 regions (Commission for Environmental Cooperation Working Group, 1997). Fields ending with "KEY" combine ecoregion code and name attributes for convenient legends and are linked to style and layer files containing color definitions. Ecoregions were digitized at 1:250,000 scale and are intended for large geographic extents (i.e. and T.P. The Commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems. Omernik, T.D. [1] 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. Electronic versions of ecoregion maps and posters as well as other ecoregion resources are available at: . The corresponding name in Canada for the same ecoregion is the Prairies Ecozone. Revision of Omernik 1987. Level IV ecoregions are further subdivisions of Level III ecoregions. states, multiple counties, or river basins). Make selections from the dropdown select box or from the clickable map of Level III and IV Ecoregions by EPA Region. 2000. The relative importance of each characteristic varies from one ecological region to another. As each of these frameworks is further refined, their differences are becoming less discernible. Ecological and biological diversity of Texas is enormous. Information and downloadable maps and datasets for Level III and IV ecoregions, listed by EPA region. They are designed to serve as a spatial framework for the research, assessment, management, and monitoring of ecosystems and ecosystem components. United States Environmental Protection Agency, Level III & IV Ecoregions of the Continental United States. Florida regionalization project. Ecoregions of Texas Level III ecoregion Level IV ecoregion County boundary State boundary Albers equal area projection 30 120 mi0 60 60 0 120 240 km. All Rights Reserved. Level IV mapping is still underway but is complete across most of the United States. Names in are alternatives included for consistancy with other TPWD initiatives. For an alternate classification system, see, Tropical and Subtropical coniferous forest. Because of this hierarchy, Level IV features include appropriate codes and names for Levels III, II, and I. List of ecoregions in the United States (WWF), North American Agreement on Environmental Cooperation, Coastal Western Hemlock-Sitka Spruce Forests, 6 Southern and Central California Chaparral and Oak Woodlands, 56 Southern Michigan/Northern Indiana Drift Plains, 60 Northern Appalachian Plateau and Uplands, 83 Eastern Great Lakes and Hudson Lowlands, 104 Interior Forested Lowlands and Uplands, List of ecoregions in North America (CEC), "Ecological Regions of North America: Toward a Common Perspective", United States Environmental Protection Agency, 120 Coastal Western Hemlock-Sitka Spruce Forests, 29 Central Oklahoma/Texas Plains (Cross Timbers), https://en.wikipedia.org/w/index.php?title=List_of_ecoregions_in_the_United_States_(EPA)&oldid=958379522, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 23 May 2020, at 13:29.