1. Plant Biology Department University of Georgia Athens Georgia30606USA
2. Institute of Ecology and Evolution University of Oregon Eugene Oregon97403USA
3. Department of Geography University of Oregon Eugene Oregon97403USA
4. Department of Landscape Architecture University of Oregon Eugene Oregon97403USA
5. Department of Natural Resources and Environmental Science University of Nevada Reno Nevada89557USA
6. Environmental Studies Program University of Colorado Boulder Boulder Colorado80309USA
7. Ecology and Evolutionary Biology Department University of Colorado Boulder Colorado80309USA
8. Biology Department Duke University Durham North Carolina27710USA