1. Department of Ecology and Environmental Science; Climate Impacts Research Centre; Umeå University; Abisko Sweden
2. Experimental Plant Ecology; Institute of Botany and Landscape Ecology; Greifswald University; Greifswald Germany
3. Center for Macroecology, Evolution and Climate; The Natural History Museum of Denmark; University of Copenhagen; Copenhagen K Denmark
4. Rubenstein School of Environment and Natural Resources; University of Vermont; Burlington VT USA