1. Institute of Geography and Spatial Organization, Polish Academy of Sciences, Kraków, Poland
2. Institute of Geography, RWTH Aachen University, Aachen, Germany
3. Institute of Geography and Spatial Management, Jagiellonian University, Kraków, Poland
4. Kevo Subarctic Research Institute, University of Turku, Kevo, Finland
5. Oulanka Research Station, University of Oulu, Oulanka, Finland
6. Kilpisjärvi Biological Station, University of Helsinki, Kilpisjärvi, Finland