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Underground coal mining and unplanned subsidence have occurred adjacent to and under Rend Lake, an 18,000 Ac impoundment in southern Illinois, for more than 90 years. Recent longwall mining permits for Rend Lake have emphasized wetland habitat enhancement as a benefit of planned subsidence that occurs under upland areas adjacent to the shoreline. However, planned subsidence under existing mudflats was viewed as a potential habitat loss. To evaluate subsidence effects, shorebird and waterfowldoi:10.21000/jasmr03010882 fatcat:7r6rj2jrurhvbgy2bxxsvppljy