1. Department of Biological Sciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA, United States of America
2. Department of Microbiology, Oregon State University, Corvallis, OR, United States of America
3. Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA, United States of America
4. Cary Institute of Ecosystem Studies, Millbrook, NY, United States of America