1. Department of Integrative Biology, Oregon State University, Corvallis, Oregon 97331;
2. School of Natural Sciences, University of California, Merced, California 95343
3. Santa Fe Institute, Santa Fe, New Mexico 87501
4. Department of Environmental Science and Policy, University of California, Davis, California 95616
5. Department of Environmental Studies, University of Colorado, Boulder, Colorado 80309
6. School of Biological Sciences, Queen's University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom
7. Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California 95060
8. Department of Biology, University of Hamburg, D-22767 Hamburg, Germany
9. Western Ecological Research Center, US Geological Survey, Santa Cruz, California 95060
10. Department of Ecology and Evolution, University of Chicago, Chicago, Illinois 60637