1. Illinois Natural History Survey, Prairie Research Institute University of Illinois Champaign Illinois USA
2. Program in Ecology, Evolution, and Conservation University of Illinois Urbana Illinois USA
3. Department of Biological Sciences Arkansas State University Jonesboro Arkansas USA
4. Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland
5. Natural Resources Institute Finland Joensuu Finland
6. Department of Ecosystems in the Barents Region, Svanhovd Research Station Norwegian Institute of Bioeconomy Research Svanvik Norway