1. Dépt de sciences biologiques; Univ. de Montréal; Montréal QC Canada
2. Inst. for Applied Ecosystem Studies; Northern Research Station, USDA Forest Service; WI USA
3. Ontario Ministry of Natural Resources and Forestry; Sault Ste.; Marie ON Canada
4. Dept of Ecology and Evolutionary Biology; Univ. of Toronto; Toronto ON Canada
5. Russell Labs; Madison WI USA
6. Iowa State Univ.; Dept of Natural Resource Ecology and Management; Ames IA USA
7. Centre d’étude de la forêt (CEF); Univ. du Québec à Montréal; Montréal QC Canada