1. Swiss Federal Research Institute for Forest, Snow and Landscape, Birmensdorf, Switzerland
2. Oeschger Centre for Climate Change Research, Bern, Switzerland
3. Institute for Forest Growth, University of Freiburg, Freiburg, Germany
4. Chair of Forest Botany, University of Freiburg, Freiburg, Germany
5. Centre for Ecological and Evolutionary Synthesis, University of Oslo, Oslo, Norway