1. Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095, USA.
2. Department of Environmental Research and Monitoring, Swedish Museum of Natural History, Box 50007, 10405 Stockholm, Sweden.
3. School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI 49931, USA.
4. Interdepartmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.
5. Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.