1. Department of Limnology and Bio-Oceanography, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
2. Technisches Büro für Biologie, Fred-Raymondgasse 19/2/4, A-1220 Vienna, Austria
3. Département Milieux et Peuplements aquatiques, Muséum national d’Histoire Naturelle UMR 7208, CP 53, 61 rue de Buffon, F-75005 Paris, France
4. Guest Researcher, Department of General Biology, UniMontes, Av. Rudy Braga, S/N, Vila Mauricéia, Montes Claros, MG, 39401-089, Brazil