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The Prairie Pothole Region (PPR) contains 5-8 million small wetlands and is one of the most ecologically valuable freshwater resources of the Nation. These wetlands provide abundant ecosystem services, including groundwater recharge, water for agriculture, water purification, and recreation. The PPR is best known as the “duck factory” of North America. By some estimates, this region produces over 50% of the ducks in North America.
U.S. Geological Survey Fact Sheet (USGS FS-2006-3144) Patuxent Wildlife Research Laboratory
Guntenspergen, Glenn R.; Johnson, W.Carter; and Naugle, David E., "Prairie Wetlands and Climate Change - Droughts and Ducks on the Prairies" (2006). Natural Resource Management Faculty Publications. 254.