A phase response curve for circannual rhythm in the varied carpet beetle <Emphasis Type="Italic">Anthrenus verbasci</Emphasis> |
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Authors: | Y?Miyazaki T?Nisimura Email author" target="_blank">H?NumataEmail author |
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Institution: | (1) Department of Bio- and Geosciences, Graduate School of Science, Osaka City University, Osaka 558-8585, Japan;(2) Present address: Department of Applied Biology, Faculty of Textile Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan |
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Abstract: | We know that entrainment, a stable phase relationship with an environmental cycle, must be established for a biological clock
to function properly. Phase response curves (PRCs), which are plots of phase shifts that result as a function of the phase
of a stimulus, have been created to examine the mode of entrainment. In circadian rhythms, single-light pulse PRCs have been
obtained by giving a light pulse to various phases of a free-running rhythm under continuous darkness. This successfully explains
the entrainment to light-dark cycles. Some organisms show circannual rhythms. In some of these, changes in photoperiod entrain
the circannual rhythms. However, no single-pulse PRCs have been created. Here we show the PRC to a long-day pulse superimposed
for 4 weeks over constant short days in the circannual pupation rhythm in the varied carpet beetle Anthrenus verbasci. Because the shape of that PRC closely resembles that of the Type 0 PRC with large phase shifts in circadian rhythms, we
suggest that an oscillator having a common feature in the phase response with the circadian clock, produces a circannual rhythm. |
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Keywords: | Anthrenus verbasci Biological clock Circannual rhythm Entrainment Phase response curve |
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