1. Department for Life Science Systems Aquatic Systems Biology Unit Limnological Research Station Iffeldorf Technical University of Munich Hofmark 1‐3 D‐82393 Iffeldorf Germany
2. Department for Life Science Systems Aquatic Systems Biology Unit Technical University of Munich Mühlenweg 22 D‐85354 Freising Germany
3. Department Surface Waters – Sedimentology Swiss Federal Institute of Aquatic Science and Technology (Eawag) Überlandstrasse 133 CH‐8600 Dübendorf Switzerland