1. Terrestrial Ecology Research Group; Department of Ecology and Ecosystem Management; School of Life Sciences Weihenstephan; Technische Universität München; D-85350 Freising Germany
2. Institute for Integrative Nature Conservation Research; University of Natural Resources and Life Sciences; A-1180 Vienna Austria
3. Instituto de Ecología; Universidad Mayor de San Andrés; Casilla 10077 La Paz Bolivia