1. Department
of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), SE-901 83 Umeå, Sweden
2. Department
of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), SE-75 007 Uppsala, Sweden
3. Department
of Earth Sciences, Uppsala University, SE-752 36 Uppsala, Sweden
4. Department
of Ecology, Swedish University of Agricultural Sciences (SLU), SE-75 007 Uppsala, Sweden
5. Department
of Earth Sciences, Gothenburg University, SE-405 30 Gothenburg, Sweden
6. Department
of Physical Geography and Ecosystem Analysis, Lund University, SE-221
00 Lund, Sweden
7. Department
of Ecology and Genetics/Limnology, Uppsala University, SE-752 36 Uppsala, Sweden