1. Division of Animal Structure and Function; Department of Cell Biology; University of Salzburg; Hellbrunnerstraße 34 5020 Salzburg Austria
2. Institute of Microbiology; University of Innsbruck; Technikerstraße 25 6020 Innsbruck Austria
3. Department of Animal Ecology; University of Bielefeld; Morgenbreede 45 33615 Bielefeld Germany