1. Department of Ecology and Genetics; University of Oulu; POB 3000 Oulu 90014 Finland
2. Department of Biological and Environmental Sciences; University of Gothenburg; Box 463 Gothenburg 40530 Sweden
3. Institute for Biological Problems of Cryolithozone; Siberian Branch of Russian Academy of Sciences; Lenin Prospect 41 Yakutsk 677980 Russia
4. Institute of Plant and Animal Ecology; Russian Academy of Sciences; 8 Marta St. 202 Ekaterinburg 620144 Russia
5. State Nature National Park Mari Chodra; Main Str. 73 Krasnogorsk Zvenigovskii District, Mari El Republic 425090 Russia
6. Institute of Zoology NAS Belarus; Akademichnaya Str. 27 Minsk 220072 Belarus
7. All-Russian Research Institute for Environment Protection; Znamenskoye-Sadki Moscow 117628 Russia
8. Ecological Scientific Research Establishment of Institute of Plant and Animal Ecology; Russian Academy of Sciences; Zelyonaya Gorka 18-1 Labytnangi Tumenskaya Region 629400 Russia
9. Juntonkatu 4 as 20; Kemi FIN-94100 Finland
10. Zoological Museum; Lomonosov Moscow State University; Bolshaya Nikitskaya Str. 6 Moscow 125009 Russia