Summary
The investigation on the locomotor activity of the pill-millipede,Arthrosphaera dalyi, kept under constant temperature and humidity, shows a persistent diurnal rhythm. The activity phase was found to occur mainly during night. In natural light condition, the activity pattern is characterised by two peaks followed by a stepwise decrease in activity during night and occasional outbursts of activity during day. The inhibitory influence of constant darkness on the activity is evident from the absence of peaks and the occasional outbursts of activity. Constant light causes a shift of nearly two hours in the setting in of the activity phase with a corresponding shift of two hours in the termination of the activity phase.
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Communicated by Dr. S. Krishnaswamy,f.a.sc.
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Paulpandian, A. A preliminary report on the diurnal rhythm in the locomotor activity of pill-millipede,Arthrosphaera dalyi (Pocock). Proc. Indian Acad. Sci. 62, 235–241 (1965). https://doi.org/10.1007/BF03051612
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DOI: https://doi.org/10.1007/BF03051612