アワヨトウ幼虫の飼育密度と個体の歩行能力について

概要

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Experiments were conducted on the walking speed and the orientation of Leucania separata larvae in relation to the rearing densities and resultant colour types. The results obtained are as follows : 1. At the 2nd and 3rd instars the larvae did not yet show colour polymorphism, and the speed of both isolated and crowded larvae, when dropped on a smoked paper, were not significantly different. 2. At the 4th to 6th instar stages, black larvae produced under crowded rearing walked significantly faster than the pale green larvae produced under individual rearing (see Fig.1). 3. In both colour types, the walking speed was faster when 10 individuals were tested together than when individual larvae were tested separately. When a pale green larva was tested with nine black larvae, the former walked nearly as fast as the latter. 4. When 10 larvae were simultaneously dropped on a point of smoked paper, the 2nd and 3rd instar lavae walked independently in different directions (Fig. 2B), while the 4th, 5th and 6th instar larvae tended to walk together in the same direction (Fig. 2D). From these results, it is considered that the density effect resulting in colour polymorphism affects the actual activity of Leucania separata larvae, not the potential walking speed.
日本生態学会の論文
1969-04-01