Abstract
We investigated the effects of photoperiod and temperature on the development of the endangered butterfly Zizina emelina under laboratory conditions, and its seasonal occurrence in Osaka Prefecture, central Japan in 2009. At 20 °C most individuals reared under conditions of <13 h of light/day entered diapause during the larval stage, whereas those reared under ≥14 h of light/day developed into adults without any developmental arrest. At 25 °C, none of the individuals entered larval diapause irrespective of the photoperiod. The critical photoperiod for diapause induction at 20 °C was 12 h 40 min. Almost all larvae that had been in diapause for 2 months (with or without chilling at 10 °C) developed into adults, and the mean pupation period after transfer to 25 °C under 16 h of light/day differed little between the two groups, suggesting that chilling is not necessary to terminate larval diapause in Z. emelina. Adults were continuously found from late April to late October, with a low population density during spring. We estimate that this species has 5–6 generations in Osaka, according to the developmental threshold, effective accumulated temperature, and critical photoperiod data obtained from the rearing experiment. The estimated seasonal life cycle was similar to the seasonal prevalence observed in the field.
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Acknowledgments
We are grateful to Dr. T. Hirowatari of the Entomological Laboratory of Kyushu University, Dr. M. Yago of The University Museum, The University of Tokyo, and Dr. H. Tsumuki, former Professor of Research Institute for Bioresources, Okayama University, for their kind advice and assistance, Mr. S. Morichi and Mr. S. Minohara of the Lepidopterological Society of Japan for collecting samples, and our laboratory colleagues for their cooperation and helpful comments. We also would like to express our sincere thanks to the members of New Kansai International Airport Company, Ltd., for giving us opportunities to conduct the survey around the airport. This study was supported in part by the Japan Society for the Promotion of Science (Grant-in-Aid for JSPS Fellows 11J10420 and Grant-in-Aid for Scientific Research 15K06934, 24510331, and 23510297).
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Sakamoto, Y., Hirai, N. & Ishii, M. Effects of photoperiod and temperature on the development and diapause of the endangered butterfly Zizina emelina (Lepidoptera: Lycaenidae). J Insect Conserv 19, 639–645 (2015). https://doi.org/10.1007/s10841-015-9786-1
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DOI: https://doi.org/10.1007/s10841-015-9786-1