1. Department of Aquatic Ecology; Swiss Federal Institute of Aquatic Science and Technology; Eawag; 8600 Duebendorf Switzerland
2. Institute of Integrative Biology; ETH Zurich; 8092 Zurich Switzerland
3. Department of Environmental Toxicology; Swiss Federal Institute of Aquatic Science and Technology; Eawag; 8600 Duebendorf Switzerland
4. Department of Environmental Systems Science; Swiss Federal Institute of Technology; ETH Zurich; 8092 Zurich Switzerland