マメゾウムシ類の比較生態学的研究 : VI.アカイロマメゾウムシの幼虫の攻撃性

概要

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Callosobruchus analis, like other members of the same genus, deposits several eggs on a single azuki bean, but characteristically only one adult emerges from each bean. This is not due to the limited food supply, because one bean is sufficient in quantity for at least two larvae to complete their development. It is presumably due to the aggressive behavior of the larvae. After hatching, the larvae burrow into the bean and progressively move to the centre where they settle and feed. When they reach the third or fourth instar, a cell is formed in the central part of the bean as a result of their feeding activity. The larvae thus encounter one another in this cell in the latter half of their larval development. Dissection of the infested beans reveals that there are dead bodies of larvae in the cell. When the bodies are not decomposed, injuries, apparently inflicted by the mandibles are observed, which undoubtedly means that they were attacked and killed by their partners. Exceptionally, two adults may emerge from one bean. In such a case there are two cells in the bean separated one another by a wall formed by broken food residues. No aggression of this kind by the larvae has been known previously among the been weevils.
日本応用動物昆虫学会の論文
1975-03-25