1. Faculty of Biological and Environmental Sciences, Organismal and Evolutionary Biology Research Programme University of Helsinki PO Box 65 Viikinkaari 1 Helsinki 00014 Finland
2. Tvärminne Zoological Station University of Helsinki J.A. Palménin tie 260 Hanko 10900 Finland
3. Department of Ecology Swedish University of Agricultural Sciences Ulls väg 16 Uppsala 756 51 Sweden
4. Spatial Foodweb Ecology Group, Department of Agricultural Sciences University of Helsinki PO Box 27 Latokartanonkaari 5 Helsinki 00014 Finland
5. Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme University of Helsinki PO Box 65 Viikinkaari 1 Helsinki 00014 Finland
6. Department of Biology University of Pisa CoNISMa, Via Derna 1 Pisa Italy
7. Baltic Sea Centre Stockholm University Svante Arrhenius väg 20 F Stockholm 106 91 Sweden
8. Research Centre for Ecological Change, Organismal and Evolutionary Biology Research Programme University of Helsinki PO Box 65 Viikinkaari 1 Helsinki 00014 Finland