コブノメイガの水田における分布と密度推定のためのサンプリング法

概要

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Spatial distribution pattern of the rice leaf roller, Cnaphalocrocis medinalis, in an experimental paddy field was analyzed using the regressive relation of mean crowding (m^^*) to mean density (m)(IWAO, 1968) to develop sampling techniques of the species. In young instar larvae the values of the slope (7) of the regressions were slightly larger than 1,indicating a weak tendency to astesation in the dispersion pattern. This tendency decreased as the larval instar advanced. The slopes reached the value of 1 and the intersections (a) of the regreeions were near 0 in the final instar larvae and the pupae. These values of the parameters indicated that each individual was distributed randomly. Although the parameters in the m^^*-m relation in the moths suggest random dispersion, they were unevenly distributed in the experimental paddy field, i.e., about twice as many as moths were observed in one side of the field as compared with those observed in the other side. Applications of the regressions for the sample size necessary to estimate the mean density for a certain confidence probability and the sampling techniques including sequential sampling were discussed using the distribution data obtained.
日本応用動物昆虫学会の論文
1985-08-25