About the Authors
Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MAG JPL CBB. Performed the experiments: MAG JPL CBB. Analyzed the data: MAG JPL CBB JS JB. Contributed reagents/materials/analysis tools: GMC JS JB. Wrote the paper: MAG JPL CBB WAB MAC WNR EFQ MLS ASH JS JB.