1. Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia in Katowice, Sosnowiec, Poland
2. Institute of Geography and Regional Development, University of Wroclaw, Wroclaw, Poland
3. Département de biologie, Université Laval, Québec, Québec, Canada
4. Centre d’études nordiques, Université Laval, Québec, Québec, Canada