1. Department of Wildlife Ecology; University of Maine; Orono ME USA
2. Center for Environmental Science Appalachian Laboratory; University of Maryland; Frostburg MD USA
3. U.S. Geological Survey; S.O. Conte Anadromous Fish Research Center; Turners Falls MA USA
4. U.S. Geological Survey; Maine Cooperative Fish and Wildlife Research Unit; University of Maine; Orono ME USA