International Journal of Animal Biology
Articles Information
International Journal of Animal Biology, Vol.2, No.1, Feb. 2016, Pub. Date: Feb. 29, 2016
Adult Eclosion Rhythm of Plodia interpunctella Under Non-24 h Photoperiods
Pages: 11-18 Views: 1227 Downloads: 883
Authors
[01] Shigeru Kikukawa, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[02] Yuta Kakihara, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[03] Hiroki Nakamura, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[04] Yuki Okano, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[05] Ayumu Saitoh, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[06] Renpei Shindou, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[07] Naoyuki Sugino, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[08] Kosuke Terayama, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[09] Jinnai Tsunekawa, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[10] Akihiro Yasui, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[11] Kazuhito Yoneda, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
Abstract
Adult eclosion rhythms of the Indian meal moth, Plodia interpunctella Hübner (Lepidoptera: Pyralidae), were observed under a variety of non-24 h photoperiods at different temperatures - 30°C, 25°C and 20°C - to investigate the entrainability of the time-keeping system. Larvae were exposed to light-dark (LD) cycles in which the light period was fixed at 12 h and the dark period varied from 2 to 18 h, and vice-versa, i.e., cycles in which the dark period was fixed at 12 h and the light period varied from 2 to 18 h. At 30°C and 25°C, the temporal positions of the eclosion peak advanced as the cycle length increased. In conditions with a constant light period of 12 h, larvae seemed mainly to respond to the light-off signal, but this response was modified by the light-on signal. Under the constant dark period of 12 h, larvae seemed to measure the cycle length. The temporal position of the adult eclosion peak (φE) is a function of the cycle length. No statistically significant difference was noted in φE between cycles observed at 30°C and 25°C. The lower and upper ends of the range of entrainability were 18-19 h and 29-30 h, respectively. At 20°C, the rhythm could be entrained only by the LD cycle durations close to 24 h. This is an uncommon phenomenon amongst insects and is a significant finding for understanding the physiological nature of the time-keeping process(es) of this species.
Keywords
Adult Eclosion Rhythm, Indian Meal Moth, Plodia interpunctella, Non-24 h Photoperiod
References
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