LINDA K. BLUM is research associate professor in the Department of Environmental Sciences at the University of Virginia. Her current research projects include study of mechanisms controlling bacterial community abundance, productivity, and structure in tidal marsh creeks; impacts of microbial processes on water quality; organic matter accretion in salt marsh sediments; and rhizosphere effects on organic matter decay in anaerobic sediments. Dr. Blum earned a B.S. and M.S. in forestry from Michigan Technological University and a Ph.D. in soil science from Cornell University. She chaired the NRC committee that recently completed a study of the Critical Ecosystem Studies Initiative.

PATRICK L. BREZONIK is professor of environmental engineering and director of the Water Resources Research Center at the University of Minnesota. Prior to his appointment at the University of Minnesota in the mid-1980s, Dr. Brezonik was professor of water chemistry and environmental science at the University of Florida. His research interests focus on biogeochemical processes in aquatic systems, with special emphasis on the impacts of human activity on water quality and element cycles in lakes. He has served as a member of the National Research Council’s Water Science and Technology Board and as a member of several of its committees. He earned a B.S. in chemistry from Marquette University and a M.S. and Ph.D. in water chemistry from the University of Wisconsin-Madison.

FRANK W. DAVIS is a Professor in the Donald Bren School of Environmental Science and Management at the University of California Santa Barbara (USCB). He received his B.A. in Biology from Williams College and Ph.D. from the Department of Geography and Environmental Engineering at The Johns Hopkins University. He joined UCSB in 1983, and established the UCSB Biogeography Lab in 1991. His research interests are in landscape ecology, regional conservation planning, and spatial decision support systems. He was Deputy Director of the National Center for Ecological Analysis and Synthesis between 1995 and 1998. Dr. Davis has been a member of three prior NRC committees.

WILLIAM L. GRAF is 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, written more than 120 scientific papers, book chapters, and reports, and given more than 90 public presentations. He is past President of the Association of American Geographers and has been an officer in the Geological Society of America. President Clinton appointed him to the Presidential Commission on American Heritage Rivers. His NRC service includes past membership on the Water Science and Technology Board and present membership on the Board on Earth Sciences and Resources. He chaired the NRC Committee on Research Priorities in Geography at the U.S. Geological Survey and the Committee on Watershed Management, and was a member of several other NRC committees. He is a National Associate of the National Academies. His Ph.D. is from the University of Wisconsin, Madison.

WAYNE C. HUBER is professor in the Department of Civil, Construction, and Environmental Engineering at Oregon State University. Prior to moving to Oregon State in 1991, he served 23 years on the faculty of the Department of Environmental Engineering Sciences at the University of Florida where he engaged in several studies involving the

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