1. U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States
2. Center for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, U.S. Environmental Protection Agency Office of Research and Development, 6201 Congdon Blvd, Duluth, Minnesota 55804, United States
3. Environmental Chemistry and Technology program, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
4. University of Wisconsin Aquatic Sciences Center, 1975 Willow Dr.;, Madison, Wisconsin 53706, United States