1. Department of Integrative Biology, University of California, 3040 Valley Life Sciences Building, Berkeley, CA 94705, USA
2. Department of Integrative Biology, University of Colorado, Denver, CO, USA
3. Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada
4. Department of Biology, University of Washington, Seattle, WA, USA
5. Division of Biological Sciences, University of Montana, Missoula, MT, USA
6. Department of Biology, Duke University, Durham, NC USA
7. Department of Ecology and Evolution, University of California, Davis, CA, USA
8. Department of Natural Resource Sciences, McGill University, Quebec, Canada
9. Department of Neurobiology, Physiology and Behavior, University of California, Davis, CA, USA
10. Department of Biology, University of Oklahoma, Norman, OK, USA
11. Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
12. Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
13. Department of Arctic Biology, The University Centre in Svalbard, Longyearbyen, Norway
14. Akvaplan-niva, Fram Centre, Tromsø, Norway
15. Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 50, 6700 AB Wageningen, The Netherlands