1. Department of Aquatic Sciences and Assessment Swedish University of Agricultural Sciences Box 7050 Uppsala SE‐750 07 Sweden
2. Department of Ecology and Environmental Science Umeå University Umeå SE‐901 87 Sweden
3. IVL Swedish Environmental Research Institute Box 53021 Göteborg SE‐400 14 Sweden
4. Department of Earth Sciences Uppsala University Villavägen 16 Uppsala 752 36 Sweden