1. Center for Applied Aquatic Ecology, North Carolina State University, Raleigh, North Carolina 27606
2. Department of Statistics, North Carolina State University, Raleigh, North Carolina 27695‐8203
3. Center for Marine Science, University of North Carolina Wilmington, Wilmington, North Carolina 28409
4. Department of Biological Sciences, University of North Carolina Wilmington, Wilmington, North Carolina 28403