1. Department of Environmental Science, Policy, and Management, College of Natural Resources, University of California , Berkeley, CA 94720 , USA
2. Museum of Vertebrate Zoology, University of California , Berkeley, CA 94720 , USA
3. Department of Biology, San Diego State University , San Diego, CA 92182 , USA
4. Department of Biology, Loyola University Chicago , Chicago, IL 60660 , USA
5. Department of Biology, Duke University , Durham, NC 27708 , USA