1. Forest & Conservation Sciences, Faculty of Forestry University of British Columbia 2424 Main Mall Vancouver BC V6T 1Z4 Canada
2. Arnold Arboretum of Harvard University 1300 Centre Street Boston MA 02131 USA
3. Organismic & Evolutionary Biology Harvard University 26 Oxford Street Cambridge MA 02138 USA
4. The Nature Conservancy 74 Wall Street Seattle WA 98121 USA
5. Department of Life Sciences, Global Change Ecology and Evolution Group Universidad de Alcalá Alcalá de Henares 28805 Spain