1. Ecology, Behavior, and Evolution Section, University of California–San Diego, La Jolla, California 92093 USA
2. Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131 USA
3. W. K. Kellogg Biological Station and Department of Plant Biology, Michigan State University, Hickory Corners, Michigan 49060 USA
4. Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720 USA
5. School of Life Sciences, Arizona State University, Tempe, Arizona 85287 USA
6. School of Plant Biology, University of Western Australia, Crawley, Western Australia 6009 Australia
7. Institute of Hazards, Risk and Resilience, Department of Geography, Durham University, Durham DH1 3LE United Kingdom