Photoperiodic Response of the Univoltine Ant-Lion Myrmeleon formicarius (Neuroptera, Myrmeleontidae)

概要

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Larvae of Myrmeleon formicarius showed a clear peak of maturation in July, when reared under the conditions of natural daylength cycle, constant temperature (24℃) and food supply throughout the year. At 21℃ first instars collected before hibernation responded to a photoperiod of 13 h or shorter by delaying the first two ecdyses, and most of them remained in either the third or second instar for a long period. In a photoperiod of 14 h or longer, most of them attained the third (last) larval stage within three months, but further development to the cocoon stage was retarded in some individuals. Those collected after hibernation developed fast in any photoperiod to the third instar, but the cocoon stage was reached without delay only in a photoperiod of 16 h. This ant-lion is thus sensitive and responsive to photoperiod at any larval stage. It is highly flexible in developmental pathway and does not cease to feed during the prolonged larval stage. Short photoperiod, low temperature and scarcity of food exerted additive retarding effects on development. These results are compared with those for the semivoltine ant-lion Hagenomyia micans, and the evolution of voltinism is discussed in relation to body size and development time.
日本昆虫学会の論文
1981-12-25