1. Department of Biology, Boston University, Boston, MA
2. University of Buenos Aires and IFEVA–CONICET, Buenos Aires, Argentina
3. Ecology, Behavior and Evolution Section, University of California, San Diego, La Jolla, CA
4. Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH
5. Department of Land, Air and Water Resources, University of California, Davis, Davis, CA
6. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO