The Spatial Distribution Pattern of Adult Emergence Holes of the Sugi Bark Borer, Semanotus japonicus (LACORDAIRE) (Coleoptera; Cerambycidae) in a Japanese Cedar Stand
1993 Volume 37 Issue 4 Pages 213-219
Details
1993 Volume 37 Issue 4 Pages 213-219
Adult emergence holes of Semanotus japonicus on trunks of the Japanese cedar up to 4m above ground were investigated at Tyunan-cho, Kagawa Prefecture from 1987 to 1989. The spatial distribution patterns of new emergence holes (NEH) in the census year and the cumulative emergence holes (CEH) made up to the census year were clarified. Annual changes in the mean number of NEH showed the falling adult abundance. CA-index values show that both NEH and CEH are contagiously distributed. The NEH CA-index was larger than the CEH value. The latter decreased year-by-year, m-m regression analysis showed the NEH distribution fitted a negative binomial distribution with a common k. The CEH distribution was a colonial distribution following a model of randomly-distributed basic components with constant mean size. New emergence holes tended to be found frequently on trees injured in the preceding year. Artificially-constructed distributions made by repeatedly overlapping the negative binomial distribution did not fit the observed CEH distribution.
