1. Center for Macroecology, Evolution and Climate (CMEC), GLOBE Institute, University of Copenhagen, 1350 Copenhagen K, Denmark.
2. Department of Life Sciences, Imperial College London, Ascot SL5 7PY, UK.
3. Danish Institute for Advanced Study, University of Southern Denmark, 5230 Odense M, Denmark.
4. Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269, USA.
5. University of Colorado Museum of Natural History, Boulder, CO 80309, USA.
6. School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, UK.
7. Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark.