1. Senckenberg Museum of Natural History Görlitz, Am Museum 1, DE-02826 Görlitz; Germany
2. Dept of Ecology; Swedish Univ. of Agricultural Sciences; Uppsala Sweden
3. EcoNetLab, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig; Germany
4. Inst. of Ecology, Friedrich Schiller Univ. Jena; Jena Germany