1. Climate Change Research Group, Kirstenbosch Research Centre, South African National Biodiversity Institute, P/Bag x7, Claremont 7735, Cape Town, South Africa,
2. Laboratoire d'Ecologie Alpine, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France,
3. Centre for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa,
4. Institute of Botany, Academy of Sciences of the Czech Republic, CZ‐252 43 Průhonice, Czech Republic,
5. Department of Ecology, Charles University, Viničná 2, CZ‐128 02 Praha 2, Czech Republic,
6. Center for Applied Biodiversity Conservation, Conservation International, 1919 M St., Washington, DC 20036, USA