1. Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC EPFL Lausanne Switzerland
2. Community Ecology Unit, Swiss Federal Institute for Forest Snow and Landscape WSL Lausanne Switzerland
3. Department of Botany & Plant Sciences University of California, Riverside Riverside California USA
4. Forest Dynamics Unit, Swiss Federal Institute for Forest Snow and Landscape WSL Birmensdorf Switzerland
5. Institute of Agricultural Sciences ETH Zurich Zurich Switzerland
6. Biology Division Glendale Community College Glendale California USA