1. Institute of Ecology and Earth Sciences University of Tartu Ravila 14A Tartu 50411 Estonia
2. Institute of Biology University of Latvia Jelgavas iela 1 LV‐1004 Rīga Latvia
3. Department of Environmental Sciences University of Basel Klingelbergstrasse 27 4056 Basel Switzerland
4. Nicolaus Copernicus University Faculty of Earth Sciences and Spatial Management Lwowska 1 Toruń 87‐100 Poland
5. Department of Geology Lund University Sölvegatan 12 SE‐223 62 Lund Sweden
6. UiT the Arctic University of Norway Dramsvegen 1 N‐9009 Tromsø Norway
7. Institute of Latvian History University of Latvia Kalpaka bulvāris 4 LV‐1050 Rīga Latvia
8. Faculty of Geography and Earth Sciences University of Latvia 1 Jelgavas Street LV‐1004 Rīga Latvia