1. USDA FS Eastern Forest Environmental Threat Assessment Center, 3041 Cornwallis RoadResearch Triangle Park, North Carolina, 27709USA
2. USDA Forest Service, Southern Research Station, Clemson University, Lehotsky HallClemson, South Carolina, 29634USA
3. Department of Biological and Environmental Sciences, Alabama A&M University, P.O. Box 1927Normal, Alabama, 35762USA
4. USDA Forest Service, Southern Research Station, 521 Devall DriveAuburn, Alabama, 36849USA