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Document Type: Regular Paper
Affiliations: 1: Organismic and Evolutionary Biology, University of Massachusetts, Amherst, MA 01003-5810, U.S.A. and 2: U.S. Geological Survey/Biological Resources Division, S.O. Conte Anadromous Fish Research Center, P. O. Box 796, One Migratory Way, Turners Falls, MA 01376, U.S.A.
Publication date: September 1, 2003