1. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA
2. Department of Biology Barnard College Columbia University New York NY USA
3. Department of Ecology, Evolution and Environmental Biology Columbia University New York NY USA
4. Department of Ecology and Evolutionary Biology University of California Los Angeles CA USA
5. Department of Botany and Plant Pathology Oregon State University Corvallis OR USA
6. Smithsonian Tropical Research Institute Apartado 0843–03092, Balboa Ancon Panama
7. Department of Biological Sciences Fordham University New York NY USA
8. Department of Biological Sciences and Museum of Natural Science Louisiana State University Baton Rouge LA USA
9. Department of Ecology and Evolutionary Biology University of Colorado Boulder CO USA