1. 201 Pesticide Research Center, National Food Safety and Toxicology Center, Department of Zoology, Institute of Environmental Toxicology, Michigan State University, East Lansing, Michigan 48824, Department of Environment Conservation, Ehime University, Tarumi 3-5-7, Matsuyama 790, Japan, Georgia Environmental Protection Department, 205 Butler Street SE, Suite 1154, Atlanta, Georgia 30334, and U.S. Fish & Wildlife Service, 4270 Norwich Street, Brunswick, Georgia 31520