This report presents the invertebrate Index of Biological Integrity (IBI) for large depressional wetlands based on work from the 1999 field season in the North Central Hardwood Forest Ecoregion in Minnesota. The study design was based on sampling of 44 wetlands selected to meet a priori criteria as either high quality, least impaired reference sites (14 sites), or wetlands receiving various degrees of human disturbance from agriculture (14 sites) or urban influences (16 sites).
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Minnesota Pollution Control Agency (St. Paul, Minnesota)
Minnesota Pollution Control Agency