Affiliation: | (1) Division of Zoology, Department of Biology, University of Oslo, Blindern, P.O. Box 1050, N0316 Oslo, Norway;(2) Hokkaido Research Center, Forestry and Forest Products Research Institute, 062-8516 Sapporo, Japan;(3) Centre for Advanced Study, Norwegian Academy of Science and Letters, Drammensveien 78, N0271 Oslo, Norway |