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Responses of the Circadian Locomotor Activity Rhythm of Mus Booduga to Shifts in LD Schedules

Geetha, L and Chandrashekaran, MK and Subbaraj, R (1996) Responses of the Circadian Locomotor Activity Rhythm of Mus Booduga to Shifts in LD Schedules. In: Chronobiology International: The Journal of Biological and Medical Rhythm Research, 13 (2). pp. 103-112.

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The responses of the field mouse Mus booduga to shifts in schedules of LD cycles were monitored and the results were interpreted with the help of a PRC constructed for the same species. The results reveal that, M. booduga reentrained faster with a lesser number of transients after delay shifts than advance shifts, thus exhibiting “asymmetry effect.” A positive correlation was observed between the number of transients and the number of hours of shift. In most of the shifts, the sign of the transients (negative for delaying transients and positive for advancing transients) coincided with the direction of the shift. Interestingly, 11 and 12 h of advance shifting resulted in delaying transients. An 11-h advance shift can also be interpreted as a 13-h delay. Reentrainment through delaying transients is faster as compared to reentrainment through advancing transients. Thus, this animal might have taken a “shorter route,” as proved by the fact that an 11-h advance shift has evoked delaying transients. But a 13-h advance shift evoked only advancing transients. This prompts us to speculate that there may be a “phase jump” in M. booduga. Further, irrespective of whether L or D has been doubled in a 12-h shift, both evoked only delaying transients.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Informa plc.
Keywords: LD shifts;Reentrainment;Mus booduga.
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Depositing User: K.S. Satyashree
Date Deposited: 22 Jan 2010 05:38
Last Modified: 22 Jan 2010 05:38
URI: http://eprints.iisc.ac.in/id/eprint/24739

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