Affiliation: | aFree University of Berlin, Department of Biology, Chemistry and Pharmacy, Institute of Biology/Zoology, Research; Group Protozoology, Königin-Luise-Str. 1–3, D-14195 Berlin, Germany;;bLeibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Limnology and Stratified Lakes, Alte Fischerhütte 2, D-16775 Stechlin-Neuglobsow, Germany;cUniversity of Cologne, Zoological Institute, Department of General Ecology and Limnology, Weyertal 119, D-50923 Cologne, Germany |