© The Nature Conservancy
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(PDF, 798 KB, 300 DPI, 8.5" x 11", Created February 01, 2004)
Developed originally by Bailey (1995) and Environment Canada (Wiken, 1986), ecoregional boundaries were by modified by The Nature Conservancy (TNC) to be used in its Biodiversity Planning exercises in the process known as Ecoregional Assessments in the continental United States, Alaska, Hawaii and Canada.
Several ecoregions were modified from the original (Bailey, 1995) by TNC staff developing the aforementioned assessments. The modifications are based on ecological, biophysical and political rationales. Changes to ecoregions in Canada were done mainly at the border with US territory, where Bailey (1995) ecoregions crossed over the country boundaries.
This is a February 2004 edition of the U.S. ecoregions map and includes eleven new draft coastal/marine ecoregions (currently being reviewed by TNC's Marine Initiative), located predominantly along the Atlantic and Pacific coasts, Alaska shoreline and in the Bering Sea, as well as several modifications of terrestrial ecoregions. Ecoregional data layer subject to continual revisions and updates.
Map size is 8.5"x11". Click on the image to access map in PDF format (resolution 300 dpi).