About the Authors

Christine Hellmann

christine.hellmann@uni-bielefeld.de

Affiliations Experimental and Systems Ecology, University of Bielefeld, Bielefeld, Germany, Ecosystem Physiology, University of Freiburg, Freiburg im Breisgau, Germany

Christiane Werner

Affiliation Ecosystem Physiology, University of Freiburg, Freiburg im Breisgau, Germany

Jens Oldeland

Affiliation Biodiversity, Evolution and Ecology of Plants, Biocentre Klein Flottbek and Botanical Garden, University of Hamburg, Hamburg, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CW CH JO. Analyzed the data: CH JO. Wrote the paper: CH CW JO. Collected data: CH.