1. Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA
2. National Centre for Ecological Analysis and Synthesis, University of California, Santa Barbara, CA 93101, USA
3. Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1
4. Department of Integrative Biology, University of California, Berkeley, CA 94720, USA
5. Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA
6. Department of Biology, Washington University, St Louis, MO 63130, USA
7. Department of Biology, University of Bergen, 5020 Bergen, Norway
8. Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92696, USA
9. Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA
10. Museum of Natural History, University of Colorado, Boulder, CO 80309, USA
11. Odum School of Ecology, University of Georgia, Athens, GA 30602, USA
12. Department of Ecology and Evolution, University of Stony Brook, Stony Brook, NY 11794, USA