About the Authors

Alison K. Macalady

amacalad@email.arizona.edu

Affiliation University of Arizona, School of Geography and Development and Laboratory of Tree-Ring Research, Tucson, Arizona, United States of America

Harald Bugmann

Affiliation Forest Ecology, Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AKM HB. Performed the experiments: AKM HB. Analyzed the data: AKM HB. Contributed reagents/materials/analysis tools: AKM HB. Wrote the paper: AKM HB.