1. Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
2. Northern Research Station, USDA Forest Service, 180 Canfield St, Morgantown, WV 26505, USA
3. University of Louisiana, PO Box 42451, Lafayette, LA 70504, USA
4. Università degli Studi di Padova, Dip. TeSAF, Treeline Ecology Research Unit, Agripolis, 35020 Legnaro (PD), Italy
5. Università Politecnica delle Marche, SAPROV, Forest Ecology and Management, Via Brecce Bianche, 60131 Ancona, Italy
6. BOKU, University of Natural Resources and Applied Life Sciences, Gregor‐Mendel‐Str. 33, 1180 Vienna, Austria
7. Institute for High Mountain Research, Innrain 52, 6020 Innsbruck, Austria
8. Slovenian Forestry Institute, Vecna pot 2, 1000 Ljubljana, Slovenia