About the Authors
- Amy E. George, Duane C. Chapman
- Columbia Environmental Research Center, U.S. Geological Survey, Columbia, Missouri, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AEG DCC. Performed the experiments: AEG DCC. Analyzed the data: AEG DCC. Contributed reagents/materials/analysis tools: AEG DCC. Wrote the manuscript: AEG DCC.