1. Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale Université de Montréal 4101 Sherbrooke Est Montréal QC H1X 2B2 Canada
2. Dipartimento di Scienze e Politiche Ambientali Università degli Studi di Milano Milano Italy
3. Département de Biologie Université de Sherbrooke Sherbrooke QC J1K 2X9 Canada
4. Department of Forest Resources Management University of British Columbia Vancouver BC V6T 1Z4 Canada
5. Department of Geography, Remote Sensing Laboratories University of Zurich Winterthurerstrasse 190 8057 Zürich Switzerland
6. Department of Geography McGill University Montréal QC H3A 0B9 Canada