Abstract
Species correlations in the subcortical community of Pinus densiflora were analyzed with indices of γ and ω proposed by IWAO (1977). All pine bait logs were attacked by Shirahoshizo spp. and Taenioglyptes fulvus because of their long active period. The basic distribution pattern in the trunk of Pinus densiflora was T. fulvus as upper part of the stem and Shirahoshizo spp. at the bottom. Although Pissodes nitidus attacked trees that lost their vigor in the spring and had the same distribution range with T. fulvus, the two species were distributed independently in each trunk unit and different niches were suggested by correlation. When pine trees weakened in the summer, two Cerambycidae participated in the community instead of P. nitidus. Monochamus alternatus and Acanthocinus griseus showed an overlapping distribution and competed severely with each other. However, M. alternatus usually won. T. fulvus seldom suffered from the presence of other species at the habitat available for development. The basic distribution pattern of the species was exclusion with each other in each trunk unit, but extreme difference in body size made possible coexistence with other species in the same habitat.
