1. US Geological Survey, Upper Midwest Environmental Sciences Center, 2630 Fanta Reed Road, La Crosse, WI 54603, USA.
2. Southern Illinois University, Center for Fisheries, Aquaculture and Aquatic Sciences and Department of Zoology, 173B Life Science II, Carbondale, IL 62901, USA.
3. Utah State University, Quinney College of Natural Resources, Department of Environment and Society, 5215 Old Main Hill, Logan, UT 84321, USA.
4. Southern Illinois University, Department of Geography and Environmental Resources, 4537 Faner Hall, Carbondale, IL 62901, USA.