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Ecoregions (or Ecological Regions) denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. There are two systems of ecoregions available to use as filters in BioData. Both are arranged in geographically hierarchical "levels." The North American is available in three levels: NA I, NA II, and NA III. The Continental United States (also know as "Omernik") is available in two levels: US III, US IV.

Hints and Tricks:
  • You are limited to selecting Ecoregions from on the one of the level categories in a filter set
  • You can save more complicated (or even simple) sets of filter criteria for future use using either of the "Save Filter Set" buttons at the top or bottom of the window
  • The links below will provide more information on Ecoregions and will open in a separate tab, so you can continue to work
  • Ecoregions for Alaska have only been delineated for US Level III, but are not currently available through BioData with data retrievals.
  • Although data from Hawaii can be found in BioData, ecoregions have not been delineated.

 

Additional Information on Ecoregions:
Codes used in BioData Retrieval SystemDescription
NA IEcoregions of North America, Level I code. For more information see U.S. Environmental Protection Agency Ecoregions of North America web site <Download Level I PDF map from EPA>.
NA IIEcoregions of North America, Level II code. For more information see U.S. Environmental Protection Agency Ecoregions of North America web site <Download Level II PDF map from EPA>.
NA IIIEcoregions of North America, Level III code. For more information see U.S. Environmental Protection Agency Ecoregions of North America web site <Download Level III PDF map from EPA>.
US IIIEcoregions of the Continental United States, Level III code. For more information see U.S. Environmental Protection Agency Level III and IV Ecoregions of the Continental United States <Download U.S. Level III PDF map from EPA>.
US IVEcoregions of the Continental United States, Level IV code. For more information see U.S. Environmental Protection Agency Level III and IV Ecoregions of the Continental United States <Download U.S. Level IV PDF map from EPA>.

 

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