A Study of the Subcortical Insect Community in Pine Trees. : II. Vertical Distribution

Abstract

The vertical distributions of the emergence of subcortical species are described. The greatest emergence density of Shirahoshizo spp. occurred at the bottom and decreased abruptly with height. In contrast, Taenioglyptes fulvus showed the maximum density higher on the stem and tapered toward the bottom. The largest number of Monochamus alternatus and Pissodes nitidus emerged from the middle part of the stem, decreasing toward the top and bottom. Acanthocinus griseus did not show any distinct changes with height from the bottom to top. Emergence of M. alternatus and A. griseus showed no relation to bark condition. A clear positive relation between occupation ratio and mean emergence density was observed for M. alternatus and T. fulvus.