1. School of Earth and Environmental Sciences, Queens College, CUNY, Flushing, New York 11367-1597
2. School of Biological Sciences, Illinois State University, Normal, Illinois 61790
3. Department of Geography, Geology, and the Environment, Illinois State University, Normal, Illinois 61790
4. Department of Geology, Whitman College, Walla Walla, Washington 99362
5. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, Arizona 85721
6. The Nature Conservancy, Albany, New York 12205
7. School of Oceanography, University of Washington, Seattle, Washington 98195