1. BIOGECO, INRA; Univ. Bordeaux; Cestas France
2. Biodiversity and Landscape Unit, Gembloux Agro-Bio Tech; University of Liège; Gembloux Belgium
3. Department of Genetics and Physiology; University of Oulu; Oulu Finland
4. Department of Forestry; Michigan State University; East Lansing Michigan
5. Forest Management Unit, Gembloux Agro-Bio Tech; University of Liège; Gembloux Belgium
6. Department of Botany and Biodiversity Research; University of Vienna; Vienna Austria