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2013年50 No.3
Observations on migratory behavior of Cnaphalocrocis medinalis: When will they take-off
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Key Words： Cnaphalocrocis medinalis, take-off ages, reproductive diapause
Abstract：Take-off behavior of the migratory moth Cnaphalocrocis medinalis (Guenée) was observed in unmated females and males 1 to 6 days after eclosion, in r. The relationship between flight performance of emigrant and local breeding populations and adult age and sex were investigated. Simulated dusk and a self-developed observation device were used. The following results were obtained: (1) There were significant differences in flight frequency between virgin moths of different ages. The number of take-offs was lowest during the first 24 hours after eclosion but peaked rapidly during the 2nd day. (2) A significantly lower proportion of males than females took off for the first long distance migration under at optimum temperature and illumination conditions. (3) C. medinalis displayed a long migration period, which meansthat their propensity and capacity to engage in such flights can be maintained for quite a long time after eclosion. (4) The local breeding population had a significantly lower average take-off frequency than the population, but still comprised a certain proportion of emigrants. This suggests that migration is a hereditary characteristic of C. medinalis that is not lost completely even under continuous captive breeding. A certain proportion of emigrants always exists in any generation.