1. Biological and Environmental Sciences; University of Stirling; Stirling FK9 4LA Scotland
2. Forest Ecology and Restoration Group; Life Sciences Department; Universidad de Alcalá; Science Building Alcalá de Henares 28805 Madrid Spain
3. CREAF Cerdanyola del Vallès; Barcelona 08193 Spain
4. Universidad Autònoma Barcelona; Cerdanyola del Vallès; Barcelona 08193 Spain
5. Laboratorio Ecotono; INIBIOMA; CONICET-Universidad Nacional del Comahue; Bariloche Río Negro Argentina
6. U.S. Geological Survey; Fort Collins Science Center; New Mexico Landscapes Field Station; Los Alamos New Mexico 87544 USA
7. Queensland Herbarium; Environmental Protection Agency; Mt Coot-tha Road Toowong Qld 4066 Australia
8. School of Biological Sciences; University of Queensland; St Lucia Qld 4072 Australia
9. Environmental Research Institute and School of Science; University of Waikato; Hamilton New Zealand
10. Max Planck Institute for Biogeochemistry; Hans-Knöll-Straße 10 07745 Jena Germany
11. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Deutscher Platz 5e; 04103 Leipzig Germany
12. Department of Ecology and Evolutionary Biology; University of California, Los Angeles; 621 Charles E. Young Drive South Los Angeles CA 90095 USA