Affiliation: | 1. Center for Development Research (ZEF), University of Bonn, Walter-Flex-Street 3, 53113 Bonn, Germany;2. Nees-Institute for Biodiversity of Plants, University of Bonn, Meckenheimer Allee 170, 53115 Bonn, Germany;3. Forest Stewardship Council, Africa-Reginal Office, P.O. Box AK 118, Anloga-Kumasi, Ghana |