モンシロチョウの幼虫密度が発育に及ぼす影響について

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  • Influence of Density of the Larval Population upon the Development in the Cabbage Butterfly, <i>Pieris rapae crucivora</i>
  • モンシロチョウ ノ ヨウチュウ ミツド ガ ハツイク ニ オヨボス エイキョウ ニ ツイテ

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The influence of population density upon the development was studied using the cabbage butterfly, Pieris rapae crucivora. The experiment was carried out under a constant temperature of 25°C and natural day-length.<br>There found some variations in larvae, pupae and adults respectively, when the larvae were reared under different densities. The changes in some internal organs, especially in the secretory organs such as corpus allatum and the suboesophageal ganglion were also examined under different densities, but there was any conclusive relation between the size of secretory organs and the bodily characters in each developmental stages.<br>The results obtained are summarized as follows:<br>From these results, it can be said that physiological activity is highest at the intermediate density than at other densities. Therefore, this density seems to be favourable for development.<br>It is interesting that Pieris rapae crucivora and Pieris brassicae have different ovipositing habit respectively, that is, the former deposits in patched form, while the latter in mass, but the intermediate density are favourable for the development of both two species.

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