ECOREGIONS OF TEXAS Glenn Griffith, Sandy Bryce, James Omernik, and Anne Rogers ECOREGIONS OF TEXAS Glenn Griffith1, Sandy Bryce2, James Omernik3, and Anne Rogers4 December 27, 2007 1Dynamac Corporation 200 SW 35th Street, Corvallis, OR 97333 (541) 754-4465; email:
[email protected] 2Dynamac Corporation 200 SW 35th Street, Corvallis, OR 97333 (541) 754-4788; email:
[email protected] 3U.S. Geological Survey c/o U.S. Environmental Protection Agency National Health and Environmental Effects Research Laboratory 200 SW 35th Street, Corvallis, OR 97333 (541) 754-4458; email:
[email protected] 4Texas Commission on Environmental Quality Surface Water Quality Monitoring Program 12100 Park 35 Circle, Building B, Austin, TX 78753 (512) 239-4597; email
[email protected] Project report to Texas Commission on Environmental Quality The preparation of this report and map was financed in part by funds from the U.S. Environmental Protection Agency Region VI, Regional Applied Research Effort (RARE) and Total Maximum Daily Load (TMDL) programs. ABSTRACT Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. Ecoregion frameworks are valuable tools for environmental research, assessment, management, and monitoring of ecosystems and ecosystem components. They have been used for setting resource management goals, developing biological criteria and establishing water quality standards. In a cooperative project with the Texas Commission on Environmental Quality, the U.S. Environmental Protection Agency, the U.S. Department of Agriculture, and other interested state and federal agencies, we have defined ecological regions of Texas at two hierarchical levels that are consistent and compatible with the U.S.