1. U.S. Geological Survey, 425 Jordan Road, Troy, New York 12180, P.O. Box 2641, Nantucket, Massachusetts 02584, Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, 5060 Lakeshore Drive Bolton, Landing, New York 12810, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland 20742, and New York State Department of Environmental Conservation, 8314 Fish Hatchery Road, Rome, New York 13440