1. D. N. Reznick, Department of Biology, University of California, Riverside, CA 92521, USA.
2. F. H. Shaw and R. G. Shaw, Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, USA.
3. F. H. Rodd, Center for Population Biology, University of California, Davis, CA 95616, USA.