1. School of Natural Resources and Environment, University of Michigan, Ann Arbor, Michigan 48109 USA
2. Biomathematics Graduate Program, North Carolina State University, Raleigh, North Carolina 27695 USA
3. Centro de Investigaciones del Mar y la Atmósfera, Departamento de Ciencias de la Atmósfera y los Océanos, and Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos (CONICET/UBA-FCEN/UMI-CNRS), Buenos Aires, Argentina
4. Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4 Canada
5. WSL Institute for Snow and Avalanche Research SLF, Fluelastrasse 11, 7260 Davos, Switzerland
6. Nature Conservation and Plant Ecology Group, Wageningen University, 6700 AA Wageningen, The Netherlands
7. Department of Forest Resources, University of Minnesota, St. Paul, Minnesota 55108 USA
8. Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, New South Wales 2751 Australia
9. Faculty of Biology, Geobotany, University of Freiburg, Schaenzlestrasse 1, 79104 Freiburg, Germany
10. Department of Ecology, Evolution and Organismal Biology, 253 Bessey Hall, Iowa State University, Ames, Iowa 50011 USA