1. Nicholas School of the Environment; Duke University; Durham NC 27708 USA
2. Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins CO 80523 USA
3. National Socio-Environmental Synthesis Center (SESYNC); Annapolis MD 21401 USA
4. Department of Integrative Biology; University of California; Berkeley CA 94704 USA
5. Department of Microbiology and Plant Biology; University of Oklahoma; Norman OK 73019 USA
6. Department of Biology; University of New Mexico; Albuquerque NM 87131 USA