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An ecoregion denotes an area that contains generally similar ecosystems. Ecoregions are defined by patterns and composition of biotic and abiotic phenomena such as geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. Level IV ecoregions are subdivisions of Level III ecoregions. Level III ecoregions delineate similar ecosystems at a regional perspective and are subdivisions of level II (national/regional perspective) and level I (continental perspective) ecoregions.
Metadata
http://oe.oregonexplorer.info/metadata/Level4ecoregions.htm
Download
http://navigator.state.or.us/sdl/data/shapefile/k250/ecoregion.zip |