オオニジュウヤホシテントウのナス畑における分布様式と棲息密度の関係 : 昆虫の分布様式に関する研究 6

概要

論文の詳細を見る
The pattern of spatial distribution of the adult of the large twenty-eight-spotted lady beetle, Epilachna 28-maculata MOTSCHULSKY, was analysed statistically by using the data on the population censuses at several egg-plant fields near Kyoto city. The frequency distribution of the beetles on a plant is random at low density. As the density increases over about 0.5 per plant, the distribution becomes concentrated and is represented by the POLYA-EGGNBERGER'S distribution. Some analyses were made to understand this phenomenon. When the number of beetles is small the insect is dtstributed randomly to the plant. At higher densities, ranging from about 0.5 to 2.0 per plant, the beetle is aggregated chiefly to such plant as is found with insects at lower densities. Namely, each plant in a field shows differential attractiveness to the beetle. It is considered that the cause of such difference among the plants is due to the complex, both the tendency of the insect itself and the heterogeneity of the environmental conditions. When the density approaches to 3.10 per plant it seems that the distribution decreases its degree of concentration and exhibits randomness again. But the data are too scarce to clear up this point.
日本生態学会の論文
1956-01-31