1. Eawag, Dept of Aquatic Ecology; Seestrasse 79, CH-6047 Kastanienbaum Switzerland
2. Research Dept for Limnology, Univ. of Innsbruck; Mondsee Austria
3. Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne; Lausanne Switzerland
4. Inst. of Ecology, Univ. of Innsbruck; Innsbruck Austria
5. ICRA, Catalan Inst. for Water Research; Girona Spain
6. UNIRIO, Núcleo de Estudos Limnológicos; Rio de Janeiro Brazil
7. School of Earth Sciences and Environmental Sustainability; Northern Arizona University USA
8. Eawag, Dept of Fish Ecology and Evolution; Kastanienbaum Switzerland
9. Eawag, Dept of Surface Waters; Kastanienbaum Switzerland