1. Wadsworth Center, New York State Department of Health, Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, Empire State Plaza, P.O. Box 509, Albany, New York 12201-0509, Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan, and Departamento de Oceanografia, Fundação Universidade Federal do Rio Grande, C.P. 474, 96201-900, Rio Grande, RS, Brazil