1. Department of Biology, University of Florida, Gainesville, FL 32611, USA
2. Smithsonian Tropical Research Institute, Balboa, Panama
3. Forest Ecology and Forest Management Group and Resource Ecology Group, Center for Ecosystem Studies, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
4. Instituto Boliviano de Investigación Forestal, PO Box 6204, Santa Cruz, Bolivia