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Leaf Size Recognition and Evaluation of Some Attelabid Weevils (1) Chonostropheus Chujoi

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Leaf recognition of the female during cradle formation was studied using model leaves, young oak leaves moulded in several shapes; observation of behaviour preceding cutting and numerical analysis of cutting points were carried out. Females repeatedly perform a sequence of walking along the circumference via the leaf apex and then cut the leaf. Circumference length is the most probable determinant of the cutting point. It is hypothesized that females perceive the most protrusive point of the leaf, the leaf apex, and the circumference length by walking. A scheme, which consists of two mechanisms for circumference measurement, for the cutting point decision is proposed. Although females do not adjust the cutting point with respect to the number of eggs to be laid in the cradle, they perceive and use leaf area or something correlative to it, for the decision as to egg number.

Affiliations: 1: Department of Zoology, Faculty of Science, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto 606 Japan


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