1. Department of Applied Ecology, Faculty of Biology, St. Petersburg State University, 16th Liniya V.O., 29, 199178 St. Petersburg, Russia
2. Tembotov Institute of Ecology of Mountain Territories, Russian Academy of Sciences, I. Armand Street 37a, 360051 Nalchik, Russia
3. Department of Cryolithology and Glaciology, Lomonosov Moscow State University, GSP-1, Leninskie Gory, 119991 Moscow, Russia
4. Institute of Geography, Russian Academy of Sciences, Staromonetnyy Pereulok, 29, 119017 Moscow, Russia
5. Forest Research Institute—Bulgarian Academy of Sciences, 132 “St. Kliment Ohridski” Blvd., 1756 Sofia, Bulgaria