1. Laboratoire Ecologie, Systématique et Evolution, UMR CNRS 8079, Université Paris-Sud, 91405 Orsay Cedex, France
2. Institute of Biology, Evolutionary Botany, University of Neuchâtel, Rue Emile Argand 11, CH 2000 Neuchâtel, Switzerland
3. Laboratorio Ecotono, INIBIOMA, Universidad del Comahue, CONICET, 8400 Bariloche, Argentina
4. CCMAR, Grupo MAREE, Universidade do Algarve, 8005-139 Faro, Portugal
5. Institute of Environmental Sciences, University of Zurich, CH 8057 Zurich, Switzerland
6. Department of Ecology and Evolution, University of Lausanne, CH 1015 Lausanne, Switzerland