1. Virginia Institute of Marine Science, William and Mary, 1375 Greate Road, Gloucester Point, VA 23062, USA.
2. Tennenbaum Marine Observatories Network, MarineGEO, Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, MD 21037, USA.
3. Department of Environmental Sciences, University of Virginia, P. O. Box 400123, Charlottesville, VA 22903, USA.
4. The Nature Conservancy, 11332 Brownsville Road, Nassawadox, VA 23413, USA.