1. Department of Biological and Environmental Science; University of Jyväskylä; Jyväskylä Finland
2. Department of Environmental Sciences; University of Helsinki; Helsinki Finland
3. Geotop; Montreal Quebec Canada
4. Department of Chemistry and Biochemistry; Concordia University; Montreal Quebec Canada
5. Department of Forest Sciences; University of Helsinki; Helsinki Finland
6. Department of Physics; University of Helsinki; Helsinki Finland
7. Department of Environmental and Biological Sciences; University of Eastern Finland; Kuopio Finland