1. W. K. Kellogg Biological StationBehavior, Michigan State University, 3700 East Gull Lake Drive, Hickory Corners, MI 49060, USA
2. School of Forestry and Environmental Studies, Yale University, 195 Prospect Street, New Haven, CT 06511, USA
3. Population Biology Graduate Group, University of California, Davis 2320 Storer Hall, One Shields Avenue, Davis, CA 95616, USA
4. Department of Plant BiologyBehavior, Michigan State University, 3700 East Gull Lake Drive, Hickory Corners, MI 49060, USA
5. Program in Ecology, Evolutionary Biology, and Behavior, Michigan State University, 3700 East Gull Lake Drive, Hickory Corners, MI 49060, USA