1. Department of Environmental and Biological Sciences; University of Eastern Finland; PO Box 1672 Yliopistonranta 1 C, FI-70211 Kuopio Finland
2. Department of Forest Sciences; University of Helsinki; PO Box 27 Latokartanonkaari 7, FI-00014 University of Helsinki Finland
3. Commission for Interdisciplinary Ecological Studies; Austrian Academy of Sciences; Dr. Ignaz-Seipel-Platz 2 1010 Vienna Austria
4. Natural Resources Institute Finland (Luke); Latokartanonkaari 9 FI-00790 Helsinki Finland
5. Laboratory of Chronology, Finnish Museum of Natural History - LUOMUS; University of Helsinki; PO Box 64 Gustaf Hällströmin katu 2, FI-00014 University of Helsinki Finland
6. Department of Botany; University of Tartu; Lai 40 51005 Tartu Estonia
7. Department of Food and Environmental Sciences; University of Helsinki; PO Box 56 Agnes Sjöbergin katu 2, FI-00014 University of Helsinki Finland