1. Institute of Plant Sciences, University of Bern, Bern, Switzerland
2. current address: US Geological Survey, Denver, CO
3. Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
4. Department of Environmental Sciences, ETH Zurich, Zurich, Switzerland
5. Ecosystem Science and Management, University of Northern British Columbia, Prince George, Canada
6. Institute of Geography, University of Bern, Bern, Switzerland
7. Department SAF, University of Palermo, Palermo, Italy
8. Institute of Biosciences and Bioresources, National Research Council, Palermo, Italy
9. Insubric Ecosystems, Swiss Federal Institute for Forest, Snow, and Landscape Research WSL, Bellinzona, Switzerland
10. Dupont Pioneer, Manno, Switzerland