1. US Geological Survey, Florence Bascom Geoscience Center, 12201 Sunrise Valley Drive, MS 926A, Reston, Virginia;, Email: lwingard@usgs.gov
2. US Geological Survey, Florence Bascom Geoscience Center, 12201 Sunrise Valley Drive, MS 926A, Reston, Virginia
3. US Geological Survey, Wetland and Aquatic Research Center, 3205 College Avenue, Davie, Florida