Effect of thermoperiod amplitude on the adult eclosion rhythm of Indian meal moth, Plodia interpunctella (Lepidoptera: Pyralidae)

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• 作者：Shigeru Kikukawa ; Hiroki Nakamura ; Ayumu Saitoh and Kosuke Terayama
• 刊名：Entomological Science
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：19
• 期：3
• 页码：310-311
• 全文大小：96K
• ISSN：1479-8298

文摘

The thermoperiodic time cue is known to be one of several zeitgebers (Zt) that entrain an organism's biological rhythms. This study investigated the adult eclosion rhythm of the Indian meal moth, Plodia interpunctella, (Lepidoptera: Pyralidae) under various thermocycles in constant darkness. The insects were exposed to different thermoperiods (e.g. 25.5°C/24.5°C). Thermophase : cryophase ratios (TC) ranged from 4 h : 20 h to 20 h : 4 h. The peak in adult eclosion rhythm occurred at Zt 18.8 ± 4.4 (mean ± SD) on a given day and at Zt 0.7 ± 3.8 on the subsequent day under TC 4 h : 20 h and TC 20 h : 4 h conditions, respectively (start of temperature increase = Zt 0). Thus, longer thermophase periods delayed the peak in eclosion. The regression line obtained was then compared with that obtained under the temperature cycle of 30°C/20°C, and the two lines were found to lie parallel to each other. The peak in adult eclosion rhythm occurred earlier under the 25.5°C/24.5°C conditions than under the 30°C/20°C conditions. The results strongly suggest that the amplitude of the temperature cycle is an important factor determining the temporal position of the peak in adult eclosion. This is a significant finding among insect species.