1. Beijing Key Laboratory of Biodiversity and Organic Farming College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China
2. Department of Ecology and Evolutionary Biology and Kansas Biological Survey University of Kansas Higuchi Hall 2101 Constant Avenue Lawrence Kansas 66047 USA
3. Department of Ecology College of Urban and Environmental Science, and Key Laboratory for Earth Surface Processes of the Ministry of Education Peking University Beijing 100080 China
4. Environmental Studies Program and Department of Biology University of Oregon Eugene Oregon 97403 USA
5. Department of Wildlife, Fish, & Conservation Biology University of California Davis Davis California 95616 USA
6. Department of Environmental Sciences University of Virginia Charlottesville Virginia 22904 USA
7. Botany Department University of Wyoming Laramie Wyoming 82071 USA
8. Department of Biological Sciences Dartmouth College Hanover New Hampshire 03755 USA
9. Department of Ecology & Evolution Biology University of Colorado Boulder Colorado 80303 USA
10. Laboratory of Populations Rockefeller University 1230 York Avenue New York New York 10065 USA