1. Northern Water Problems Institute, Karelian Research Center, Russian Academy of Sciences, Petrozavodsk, Russia
2. Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Geneva, Switzerland
3. Limnology Center, Lausanne, Switzerland
4. Physics of Aquatic Systems Laboratory, Margaretha Kamprad Chair, Lausanne, Switzerland