1. Department of Vertebrate Ecology and Zoology; University of Gdańsk; ul. Wita Stwosza 59 80-308 Gdańsk Poland
2. Department of Genetics; University of Gdańsk; ul. Wita Stwosza 59 80-308 Gdańsk Poland
3. Department of Bioscience; Aarhus University; Frederiksborgvej 399 4000 Roskilde Denmark
4. Littoral, Environnement et Sociétés; UMR 7266 CNRS-Université La Rochelle; 2 rue Olympe de Gouges 17000 La Rochelle France
5. Russian Arctic National Park; 57 Sovetskikh Kosmonavtov pr. 163000 Archangelsk Russian Federation
6. Joint Directorate of Taimyr Nature Reserves; 22 Talnakhskaya 663300 Norilsk Russian Federation
7. Department of Biology; Queen's University; Kingston ON K7L 3N6 Canada