1. Department of Ecology; Charles University, Faculty of Science; Viničná 7 128 44 Prague 2 Czech Republic
2. Institute for Environmental Studies; Charles University, Faculty of Science; Benátská 2 128 01 Prague 2 Czech Republic
3. Department of Zoology and Fisheries, Faculty of Agrobiology; Food and Natural Resources, Czech University of Life Sciences Prague; 165 21 Prague 6 Czech Republic
4. University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters; South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses; Zátiší 728/II 389 25 Vodňany Czech Republic