「神奈川県産」アカボシゴマダラ幼虫の休眠誘起に及ぼす葉質の影響

概要

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The influence of leaf quality on larval diapause induction in the alien nymphalid species Hestina assimilis assimilis was examined under laboratory conditions. At a temperature of 20℃ and a short photoperiod of 10L-14D, all larvae entered diapause at 4 th instar, when they were reared not only on mature leaves of Celtis sinensis but also on young leaves. By contrast, at 25℃ and 10L-14D, the larvae reared on mature leaves frequently entered diapause at 4 th or 5 th instar, while most of the larvae reared on young leaves failed to enter diapause, and then became pupae. Diapause occurred in larvae of short-horn type, but not long horn type. Short horn type larvae invariably changed their body color from green to brown in these conditions. Physical and nutritional analyses of Celtis leaves showed that young leaves were more tender and had a lower CN ratio than mature ones, suggesting that the young leaves are nutritionally rich. Thus, diapause induction of this species seems to be partially affected by leaf quality under a high temperature such as 25℃ even at a short photoperiod. The ecological significance of these results is discussed based on information from observations of this species obtained in the field.
2013-07-25