1. Protistology & Aquatic Ecology (PAE), Department of Biology, Faculty of Science, Ghent University, Krijgslaan 281-S8, B–9000 Ghent, Belgium
2. Department of Bryophyta & Thallophyta, Botanic Garden Meise, Nieuwelaan 38, B–1860 Meise, Belgium
3. Ecosystem Management Research Group (ECOBE), Department of Biology, Faculty of Science, University of Antwerp, Universiteitsplein 1, B–2610 Wilrijk, Antwerpen, Belgium
4. Department of Ecology, Faculty of Science, Charles University in Prague, Viničná 7, CZ–12844 Prague 2, Czech Republic