1. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LECA, Laboratoire d’Écologie Alpine, F-38000 Grenoble, France.
2. Department of Biology, McGill University, Montreal, QC H3A 1B1, Canada.
3. Environmental Geography Group, Institute for Environmental Studies, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, Netherlands.
4. Frederick S. Pardee Center for International Futures, Josef Korbel School of International Studies, University of Denver, Denver, CO 80208, USA.
5. Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland.
6. Department of Biology and Biotechnologies “Charles Darwin,” University of Rome “La Sapienza,” Rome, Italy.