Christina Bock – Postdoctoral Fellow at the University Duisburg-Essen, Germany Rodan Geriš – Hydrobiologist at the water management laboratory of the Morava River Board, s. e., Brno, Czech RepublicLothar Krienitz - Head (retired) of the laboratory of phycology and algal strain collection at the Leibniz Institute of Freshwater Ecology and Inland Fisheries, Stechlin, GermanyPavel Škaloud – Associate Professor at the Charles University, Prague, Czech Republic