Level III Ecoregions of EPA Region 10

ecoregions by epa region were extracted from the seamless national shapefile ecoregions denote areas of general similarity in ecosystems and in the type quality and quantity of environmental resources they are designed to serve as a spatial framework for the research assessment management and monitoring of ecosystems and ecosystem components these general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies state agencies and nongovernment organizations that are responsible for different types of resources within the same geographical areas the approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of patterns of biotic and abiotic phenomena including geology physiography vegetation climate soils land use wildlife and hydrology the relative importance of each characteristic varies from one ecological region to another a roman numeral hierarchical scheme has been adopted for different levels for ecological regions level i is the coarsest level dividing north america into 15 ecological regions level ii divides the continent into 52 regions commission for environmental cooperation working group 1997 at level iii the continental united states contains 104 regions whereas the conterminous united states has 84 u s environmental protection agency 2005 level iv ecoregions are further subdivisions of level iii ecoregions methods used to define the ecoregions are explained in omernik 1995 2004 omernik and others 2000 and gallant and others 1989 literature cited commission for environmental cooperation working group 1997 ecological regions of north america toward a common perspective montreal commission for environmental cooperation 71 p gallant a l whittier t r larsen d p omernik j m and hughes r m 1989 regionalization as a tool for managing environmental resources corvallis oregon u s environmental protection agency epa 600 3 89 060 152p omernik j m 1995 ecoregions a framework for environmental management in davis w s and simon t p eds biological assessment and criteria tools for water resource planning and decision making boca raton florida lewis publishers p 49 62 omernik j m chapman s s lillie r a and dumke r t 2000 ecoregions of wisconsin transactions of the wisconsin academy of science arts and letters v 88 p 77 103 omernik j m 2004 perspectives on the nature and definitions of ecological regions environmental management v 34 supplement 1 p s27 s38 comments and questions regarding ecoregions should be addressed to glenn griffith usgs c o us epa 200 sw 35th street corvallis or 97333 541 754 4465 email griffith glenn epa gov alternate james omernik usgs c o us epa 200 sw 35th street corvallis or 97333 541 754 4458 email omernik james epa gov

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