1. Department of Biology Duke University Durham NC USA
2. U.S. Geological Survey Upper Midwest Environmental Sciences Center La Crosse WI USA
3. Canadian Rivers Institute University of New Brunswick Fredericton NB Canada
4. Department of Geological Sciences University of North Carolina at Chapel Hill Chapel Hill NC USA
5. Department of Environmental Science and Policy University of California Davis Davis CA USA
6. Canadian Rivers Institute Forestry and Environmental Management University of New Brunswick Fredericton NB Canada