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| | EPA-Ecoregions of Arkansas (Site not responding. Last check: 2007-11-02) |
 | | The approach used to compile the ecoregion map of Arkansas is based on the premise that ecological regions can be identified through the analysis of the spatial patterns and the composition of biotic and abiotic characteristics that affect or reflect differences in ecosystem quality and integrity (Wiken, 1986; Omernik, 1987, 1995). |
 | | In Arkansas, there are 7 level III ecoregions and 32 level IV ecoregions; all but four level IV ecoregions continue into ecologically similar parts of adjacent states (Chapman and others, 2002, 2004a, 2004b; Griffith, Omernik, and Azevedo, 1998). |
 | | Arkansas ecological diversity is strongly related to regional physiography, geology, soil, climate, and land use. |
| www.epa.gov /wed/pages/ecoregions/ar_eco.htm (1373 words) |
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