1. Department of Forest and Wildlife Ecology; University of Wisconsin-Madison; 1630 Linden Drive Madison WI 53706 U.S.A.
2. Faculty of Biology; Lomonosov Moscow State University; 1-12 Leninskie Gory Moscow 119991 Russia
3. Department of Zoology; University of Wisconsin-Madison; 430 Lincoln Drive Madison WI 53706 U.S.A.
4. Geography Department; Humboldt-Universitat zu Berlin; Unter den Linden 6 10099 Berlin Germany
5. Severtsov Institute of Ecology and Evolution; 33 Leninsky pr. Moscow 117071 Russia
6. FGU ‘Thentrohotcontrol’; 4 Zoologicheskaya str. Moscow 123056 Russia
7. Department of Statistics; University of Wisconsin-Madison; 1300 University Avenue Madison WI 53706 U.S.A.