The aquatic ecosystem-based corea area selection index was used to create the aquatic ecosystem-based cores. It has the same value as the index of ecological integrity (IEI), except where headwater streams occur, in which case the index is the average of the IEI and the USGS stream temperature tolerance index. This layer can be used to understand the relative ecological contribution of aquatic cores and as information about the relative ecological value of areas surrounding the aquatic cores.
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Read the Technical Abstract for this data layer (aSelectionIndex.tif).