Domingo Heber1, Thorsten Stoeck2, Wilhelm Foissner1. 1. Department of Organismic Biology, University of Salzburg, Hellbrunner Strasse 34, Salzburg, 5020, Austria. 2. Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Strasse 14, Kaiserslautern, 67663, Germany.