current work in East Africa focuses on the role of wetlands in the maintenance of fish faunal structure and diversity. She is also involved in the conservation and management of tropical waters with an emphasis on patterns of species loss and resurgence in the Lake Victoria basin. She received her Ph.D. from McGill University in 1990.

Peter L.deFur is president of a consulting firm, Environmental Stewardship Concepts, and is an affiliate associate professor at the Center for Environmental Studies at Virginia Commonwealth University. He has extensive experience in risk assessment and ecological risk assessment regulations, guidance, and policy. Dr. deFur also worked as a visiting investigator at the Smithsonian Environmental Research Center in Edgewater, Maryland. He was a member of the NRC Board on Environmental Studies and Toxicology (BEST). He serves on the Board of the Science and Environmental Health Network, and he serves as president of the Association for Science in the Public Interest. In 1994–1996 Dr. deFur served on the National Research Council's Committee on Risk Characterization. He received his B.S. and M.S. degrees in biology (1972 and 1977, respectively) from the College of William and Mary, and his Ph.D. in biology (1980) from the University of Calgary, Alberta, Canada.

F.Dominic Dottavio has served as the dean and director of the Ohio State University at Marion since 1993, where he also holds an appointment as a professor of natural resources. Prior to arriving at Ohio State, he was the chief scientist and assistant regional director of the National Park Service in Atlanta. In this position, Dr. Dottavio was responsible for the Park Service's scientific and natural resource management activities in 58 parks and 5 universities throughout the southeastern United States, Puerto Rico and the Virgin Islands. He also has served as director of the Center for Natural Areas in Washington, D.C., and was a policy analyst with the Heritage Conservation/Recreation Service. Dr. Dottavio has authored over 100 publications on tourism, outdoor recreation, and Natural Parks Service resource management issues and has served on the boards and advisory councils of a number of professional organizations, including the Renewable Natural Resources Foundation, Archbold Tropical Research Center, Southern Appalachians Man and the Biosphere Program, Virgin Islands Research and Resource Management Cooperative, and Oak Studies Board. He earned a B.S. in natural resource management in 1973 from the Ohio State University, an M.S. from Yale University in 1975, and a Ph.D. from Purdue University in 1979.

William L.Graf is the Education Foundation University Professor and professor of geography at the University of South Carolina. His specialties include fluvial geomorphology and hydrology, as well as policy for public land and water. His research and teaching have focused on river-channel change, human impacts on river processes, morphology, and ecology, along with contaminant transport and storage in river systems. In the arena of public policy, he has emphasized the interaction of science and decision making, and the resolution of conflicts among economic development, historical preservation, and environmental restoration for rivers. He has authored or edited 7 books and more than 120 scientific papers, book chapters, and reports, and he has given more than 90 public presentations. He is past president of the Association of American Geographers and has been an

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