International Journal of Animal Biology
Articles Information
International Journal of Animal Biology, Vol.2, No.2, Apr. 2016, Pub. Date: Jun. 17, 2016
Adult Eclosion Rhythm of Plodia interpunctella: Response to Photoperiod and Thermoperiod with Different Phase Angles
Pages: 19-25 Views: 1989 Downloads: 1082
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] Ayumu Saitoh, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[05] Renpei Shindou, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[06] Naoyuki Sugino, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[07] Kosuke Terayama, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
[08] Jinnai Tsunekawa, Biological Institute, Faculty of Science, University of Toyama, Toyama, Japan.
Abstract
The interacting effects of photoperiod and thermoperiod with different phase angles on the adult eclosion rhythm of the Indian meal moth, Plodia interpunctella Hübner (Lepidoptera: Pyralidae), are investigated. The photoperiod is LD 12:12 h (L=light and D=dark) and the thermoperiods (TC 12:12 h where T=thermophase and C=cryophase) are 30°C/20°C, 28.5°C/21.5°C, 28°C/22°C, 27.5°C/22.5°C, 26.5°C/23.5°C and 25.5°C/24.5°C. For each temperature cycle, the average temperature is 25°C. When the photoperiod is superimposed on to the thermoperiod of 30°C/20°C, the temporal position of the adult eclosion peak (φE) is within the thermophase (30°C) regardless of the LD cycle. However, when the thermoperiod is 25.5°C/24.5°C, φE occurs at approximately Zeitgeber time (Zt) 3.3 after the light-on signal, regardless of the phase difference between photoperiod and thermoperiod. For the thermocycles of 28.5°C/21.5°C - 26.5°C/23.5°C, intermediate responses are observed. When 27.5°C/22.5°C is coupled with LD 12:12 h and the phase angle is changed, a phase jump of φE occurs at 12-16 h after light-on of the phase difference between LD cycle and TC cycle. This strongly indicates that at least two components of the time-keeping system are involved in determining the temporal position of φE. Thermocycle, therefore, appears to be a useful tool for analyzing temporal organization of the adult eclosion rhythm of this insect species.
Keywords
Adult Eclosion Rhythm, Indian Meal Moth, Photoperiod, Thermoperiod
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