About the Authors

Silke Werth

silke@hi.is

Affiliations Swiss Federal Research Institute WSL, Birmensdorf, Switzerland, University of Iceland, Dept. Life- and Environmental Sciences, Reykjavik, Iceland

Christoph Scheidegger

Affiliation Swiss Federal Research Institute WSL, Birmensdorf, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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