1. Department of River Ecology, Helmholtz Centre for Environmental Research − UFZ, Brückstraße 3A, Magdeburg, Germany
2. Department of Biology, Dalhousie University, 1355 Oxford St., Halifax, Canada
3. Department of Aquatic Ecosystem Analysis and Management, Helmholtz Centre for Environmental Research − UFZ, Brückstraße 3A, Magdeburg, Germany