1. Department of Ecology and Evolutionary Biology and University of Colorado Museum; University of Colorado; Boulder; CO; 80309-0334; USA
2. Department of Biology; City College of New York; New York; NY; 10031; USA
3. Institute of Arctic Biology; University of Alaska Fairbanks; Fairbanks; AK; 99775-7000; USA
4. Institute of Plant and Animal Ecology; Ural Branch of Russian Academy of Sciences; Yekaterinburg; 620219; Russia
5. Faculty of Archaeology; Leiden University; Leiden; 2311 BE; The Netherlands
6. Research Group Molecular Ecology; Max-Planck Institute for Evolutionary Anthropology; Leipzig; 04103; Germany