1. AXYS Analytical Services, Sidney, British Columbia, Canada, School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405, Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, New York 14853, Midwest Center for Environmental Science and Public Policy, Milwaukee, Wisconsin 53202, Department of Natural Resources, Cornell University, Ithaca, New York 14853, and Institute for Health and the Environment, University at Albany, One University...