1. Division of Behavioural Ecology Institute of Ecology and Evolution University of Bern Hinterkappelen Switzerland
2. Conservation Ecology Evolution and Behaviour Research Group Ecology and Environment Research Centre Department for Natural Sciences Manchester Metropolitan University Manchester UK
3. Institute of Evolutionary Biology and Ecology University of Bonn Bonn Germany
4. Sektion Ichthyologie Zoologisches Forschungsmuseum Alexander Koenig Bonn Germany
5. Division of Aquatic Ecology and Evolution Institute of Ecology and Evolution University of Bern Bern Switzerland
6. Department of Fish Ecology and Evolution Centre for Ecology and Evolution, and Biochemistry Swiss Federal Institute of Aquatic Science and Technology (EAWAG) Kastanienbaum Switzerland