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In 2013, the first of several Regional Stream Quality Assessments (RSQA) was done in the Midwest United States. The Midwest Stream Quality Assessment (MSQA) was a collaborative study by the U.S. Geological Survey National Water Quality Assessment and the U.S. Environmental Protection Agency National Rivers and Streams Assessment. One of the objectives of the RSQA, and thus the MSQA, is to characterize relations between stream ecology and water-quality stressors to determine the relative effects of these stressors on aquatic biota in streams. Data required to meet this objective included fish species and abundance data and physical and chemical water-quality characteristics of the ecological reaches of the sites...
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These data layers represent the number of unique fish species found in each 8-digit HUC in the SARP region.  It was derived from NatureServe's Digital Distribution Maps of the Freshwater Fishes in the Conterminous United States, version 3.0.The individual species shapfiles were merged together in ArcGIS and a count of the unique fish species within each 8-digit HUC was calculated. The dataset offers 2 sets of symbology - one with 5 classes and one with 8 classes - to illustrate the range of biodiversity in the region.  ..These data are dynamic with new records frequently being added and old records being revised as new information is received. As a result, the information on this website should not be considered...


    map background search result map search result map Count of Fish Species per 8-digit HUC in the SARP Region Fish and selected physical and chemical water-quality data for the U.S. Geological Survey Midwest Stream Quality Assessment Fish and selected physical and chemical water-quality data for the U.S. Geological Survey Midwest Stream Quality Assessment Count of Fish Species per 8-digit HUC in the SARP Region