1. Instituto Multidisciplinario de Biología Vegetal (CONICET — UNC) and F.C.E.F.y N., Universidad Nacional de Córdoba, Casilla de Correo 495, Vélez Sársfield 299, 5000 Córdoba, Argentina
2. Unit of Comparative Plant Ecology, Department of Animal and Plant Sciences, The University, Sheffield S10 2TN, UK
3. Department of Systems Ecology, Faculty Earth and Life Sciences, Free University, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
4. Research Institute of Forests and Rangelands, P.O. Box 13185–116, Tehran, Iran
5. Departamento de Ecología Funcional y Biodiversidad, Instituto Pirenaico de Ecología (CSIC), Aptdo. 202, E‐50080 Zaragoza, Spain
6. Department of Archaeology and Prehistory, The University, Sheffield S1 4ET, UK
7. Institut Botànic de Barcelona, Parc Montjuïc, Av. dels Muntanyans s/n, 08038 Barcelona, Spain
8. Department of Animal and Plant Sciences, The University, Sheffield S10 2TN, UK