1. Department of Ecology and Evolution, University of TennesseeKnoxville, TN 37996, USA
2. School of Biological Sciences, Royal Holloway, University of LondonEgham, Surrey TW20 0EX, UK
3. Environmental Studies Program, The Evergreen State CollegeOlympia, WA 98505, USA
4. Department of Biology, Appalachian State UniversityBoone, NC 28608-2027, USA
5. Department of Chemistry, US Naval AcademyAnnapolis, MA 21402, USA
6. Department of Biological Sciences, Idaho State UniversityPO Box 335, Pocatello, ID 83209-8007, USA
7. Department of Biological Sciences, The Environmental Genetics and Genomics Facility and Merriam-Powell Center for Environmental Research, Northern Arizona UniversityFlagstaff, AZ 86011, USA