1. Department of Biology, University of WashingtonPO Box 351800, Seattle, WA 98195, USA
2. Department of Atmospheric and Oceanic Science, University of CaliforniaLos Angeles, CA 90095, USA
3. Sam Noble Oklahoma Museum of Natural History and Department of Zoology, University of OklahomaNorman, OK 73072, USA
4. Department of Biology, Barnard CollegeNew York, NY 10027, USA
5. Faculty of Education, University of Puerto RicoRio Piedras, PR 00931, USA
6. Department of Biology, University of CaliforniaRiverside, CA 92521, USA