1. Biogeodynamics and Biodiversity Group, Center for Advanced Studies of Blanes, CSIC, Accés a la Cala St. Francesc 14, 17300 Blanes, Spain
2. Catalan Institute for Water Research, Scientific and Technological Park of the University of Girona, Emily Grahit 101, H2O Building, 17003 Girona, Spain
3. Department of Ecology, Faculty of Biology, University of Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
4. Department of Microbial Ecology, Ecology Centre, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
5. Department of Freshwater Ecology and Hydrobotany, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
6. Interuniversity Center for Aquatic Ecosystem Research, WasserCluster Lunz, Dr. Carl Kupelwieser Promenade, A-3293 Lunz am See, Austria