1. Department of Ecology and Evolutionary Biology University of Tennessee Knoxville Tennessee
2. National Institute for Mathematical and Biological Synthesis University of Tennessee Knoxville Tennessee
3. Center for Macroecology, Evolution and Climate Natural History Museum of Denmark University of Copenhagen Copenhagen Denmark
4. Quebec Centre for Biodiversity Science Department of Biology McGill University Montreal Quebec Canada
5. Department of Biological Sciences North Carolina State University Raleigh North Carolina
6. Department of Mathematics University of Utah Salt Lake City Utah
7. Department of Biology University of Utah Salt Lake City Utah