1. Biology Department; Baylor University; Waco Texas 76798 USA
2. Department of Biogeography; Trier University; 54496 Trier Germany
3. Natural History Museum Vienna; 1010 Vienna Austria
4. Chair of Ecology and Biogeography; Nicolaus Copernicus University; 87-100 Toruń Poland
5. Department of Ecology and Ecosystem Management; Technische Universität München; D-85350 Freising-Weihenstephan Germany