Affiliation: | (1) Institute of Biological Sciences, University of Tsukuba, Sakura-Mura, 305 Ibaraki, Japan;(2) Institute of Resource Ecology, University of British Columbia, V6T 1W5 Vancouver, B. C., Canada;(3) Institute of Resource Ecology, University of British Columbia, V6T 1W5 Vancouver, B. C., Canada |