1. Department of Botany, Faculty of ScienceUniversity of South Bohemia Branišovská 1760 České Budějovice 37005 Czech Republic
2. Department of Ecology, Faculty of SciencesUniversity of Pécs Ifjúság u.6 Pécs H‐7624 Hungary
3. Department for Nature Conservation and Landscape PlanningAnhalt University of Applied Sciences Strenzfelder Allee 28 Bernburg 06406 Germany
4. Department of Hydrobiology, Faculty of SciencesUniversity of Pécs Ifjúság u.6 Pécs H‐7624 Hungary
5. Institute of BotanyCzech Academy of Science Dukelská 135 Třeboň 37982 Czech Republic