キャベツ畑におけるモンシロチョウ卵の分布様式とその集中傾向に関係する要因について

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To clarify the mechanism of the concentrating distribution in the eggs of the common cabbage butterfly, Pieris rapae crucivora in a cabbage farm, the censuses were made on every cabbage plant during the period from June 27 to June 18 of 1953 successively in Sendal, and the newly laid eggs on each observed day were discriminated by marking. The factors affecting the distribution pattern were examined from the points of the heterogeneity of environmental conditions and the oviposition habit of the butterfly. The results were as follows : 1. The heterogeneity of plant characters affects slightly the distribution pattern of the newly laid eggs on each observed day but has close relation with the cumulative number of the eggs extended over a long period of time. From the fact, it seems that the oviposition in each day is not so related to plant characters as the distribution of eggs is prescribed by them but the slight tendency to lay eggs in relation to the plant characters accumulated for a long time. 2. In most cases, the eggs are laid densely in a part of the field and the densely populated portion appears at different places everyday. It seems that this spatial unevenness is formed by chance in early summer because of the random position of the densely populated portion. But, the distribution pattern of the newly laid eggs is affected more closely by the spatial unevenness than the heterogeneity of plant characters. 3. The degree of concentration in the distribution of the newly laid eggs relates to the density. As the density of the eggs is increased, the oviposition is apt to have relation to the plant characters and the newly laid eggs distribute more unevenly. Accordingly, it is conceivable that the relation between the distribution pattern and the density is mediated by the heterogeneity of environmental conditions. 4. In the field where the environmental conditions are homogeneous, the newly laid eggs tend to distribute concentrically. This tendency may be due to the oviposition habit of the butterflies. On the supposition that the visiting of butterflies to each plant is at random but the number of eggs laid at a time by them is different, the applicability of the generalized POISSON distribution to the observed one is tested and close agreement between them is obtained. 5. After the laying the eggs disappear not at random from each plant(this disappearance may be due mainly to the incubation). It seems that their disappearance is inverse density-dependent, therefore the distribution of the eggs remains concentrically more than eight days thereafter. The distribution pattern of the eggs becomes more concentric by the accumulation of the eggs which are laid on previous days and remained till each observed day.
日本生態学会の論文
1960-08-01

キャベツ畑におけるモンシロチョウ卵の分布様式とその集中傾向に関係する要因について

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