1. a U.S. Geological Survey, Northern Appalachian Research Laboratory , 176 Straight Run Road, Wellsboro , Pennsylvania , 16901 , USA
2. b U.S. Geological Survey, Tennessee Cooperative Fishery Research Unit, Tennessee Technological University , Cookeville , Tennessee , 38505 , USA
3. c U.S. Geological Survey, Environmental and Contaminants Research Center , Columbia , Missouri , 65201 , USA