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Temporal profile of the number of Poweshiek skipperling occurrences that were documented on unique days. Survey effort for this species increased in the mid-1990s (Selby 2005, Swengel et al. 2010). Poweshiek skipperling were listed as federally endangered in the United States and Canada in 2014 (COSEWIC - Committee on the Status of Endangered Wildlife in Canada 2014, USFWS - U.S. Fish and Wildlife Service 2014).
