1. Catalan Institute for Water Research (ICRA); Girona Spain
2. Department of Ecology and Genetics, Limnology; Uppsala University; Uppsala Sweden
3. Department of Plant Biology and Ecology, Faculty of Science and Technology; University of the Basque Country; Bilbao Spain
4. Ecology of Aquatic Systems (ESA); Université Libre de Bruxelles; Brussels Belgium
5. Department of Ecology; University of Barcelona; Barcelona Spain
6. Leibniz-Institute of Freshwater Ecology and Inland Fisheries; Berlin Germany