1. Dept of Agricultural Sciences, Univ. of Helsinki Helsinki Finland
2. Dept of Biological and Environmental Science, Univ. of Jyväskylä Jyväskylä Finland
3. Dept of Ecology, Swedish Univ. of Agric. Sciences Uppsala Sweden
4. State Key Laboratory of Genetic Resources and Evolution, Kunming Inst. of Zoology, Chinese Academy of Sciences Kunming Yunnan China
5. Arctic Research Centre, Dept of Bioscience, Aarhus Univ. Roskilde Denmark
6. School of Biological Sciences, Univ. of East Anglia Norfolk UK
7. Organismal and Evolutionary Biology Research Program, Univ. of Helsinki Helsinki Finland