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A phase response curve for circannual rhythm in the varied carpet beetle Anthrenus verbasci.
- Source :
-
Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology . Oct2005, Vol. 191 Issue 10, p883-887. 5p. 2 Graphs. - Publication Year :
- 2005
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03407594
- Volume :
- 191
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 18485911
- Full Text :
- https://doi.org/10.1007/s00359-005-0012-6