[1] Univ Bordeaux, UMR EPOC, Bordeaux, France
[2] Czech Acad Sci, Inst Bot, Pruhonice, Czech Republic
[3] Univ South Bohemia, Fac Sci, Dept Bot, Ceske Budejovice, Czech Republic
[4] Univ Picardie Jules Verne, Ecol & Dynam Syst Anthropises EDYSAN, UMR CNRS 7058, Amiens, France
[5] Univ Pretoria, Dept Plant & Soil Sci, Pretoria, South Africa
[6] Univ Basel, Dept Environm Sci, Basel, Switzerland
[7] WSL Inst Schnee & Lawinenforschung SLF, Davos, Switzerland