Affiliation: | 1. Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, ?eské Budějovice, Czech Republic;2. Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic;3. Evides Water Company, Rotterdam, The Netherlands;4. Faculty of Economics, University of South Bohemia, ?eské Budějovice, Czech Republic;5. AqWa, Goes, The Netherlands |