About the Authors
National Center for Ecological Analysis and Synthesis, Santa Barbara, California, United States of America
Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, United States of America
Santa Fe Institute, Santa Fe, New Mexico, United States of America
Howard Hughes Medical Institute
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SA MP. Performed the experiments: SA. Analyzed the data: SA. Wrote the paper: SA MP.