1 Department of Zoology, University of British Columbia, Vancouver, V6T 1Z4, Canada. Electronic address: whitlock@zoology.ubc.ca.
2 Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA.
3 Department of Wildlife Ecology and Conservation, University of Florida, PO Box 110430, Gainesville, FL 32611-0430, USA; Center for Latin American Studies, University of Florida, PO Box 11530, Gainesville, FL 32611-5530, USA.
4 Harvard Forest, Harvard University, Petersham, MA 01366, USA.
5 Department of Entomology, University of Kentucky, Lexington, KY 40546-0091, USA.
6 Department of Biological Sciences, Dartmouth College, Hanover, NH, USA.
7 Department of Genetics, University of Georgia, Athens, GA 30602, USA.
8 Department of Biology, Duke University, Durham, NC 27708, USA.
9 Department of Botany, University of British Columbia, Vancouver, V6T 1Z4, Canada.
10 School of Biology, University of St Andrews, St Andrews, KY16 9AJ, UK.
11 Department of Ecology, Evolution and Behavior, University of Minnesota, Minneapolis, MN 55108, USA.