Circadian Rhythms in Locomotor Activity in the Hagfish, Eptatretus burgeri, and the Effect of Reversal of Light-Dark Cycle(Behavior Biology)

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locomotor activity of the hag fish, Eptatretus burgeri, was measured by use of an infra-red light-photocell system. The hag fish showed a clear nocturnal rhythm of swimming activity under 12L: 12D (7: 00-19: 00 light, 19: 00-7: 00 dark). This activity occurred only in the first 2/3 of the dark-time. Hag fish kept in constant darkness displayed a distinct free-running rhythm. The intrinsic periodicity of free-running locomotor activity ranged between 23.0 and 24.7 hours. If the light-dark cycle was reversed (7: 00-19: 00 dark, 19: 00-7: 00 light), the activity pattern of the animal adapted to the new light regimen whether light-dark reversal was done by doubling the first light-time or by doubling the first dark-time. The average time necessary to shift to the new dark period was 12.7±0.9 days by doubling the first light-time and it was 7.7± 1.3 days by doubling the first dark-time. This shows that the phase shift occurs more easily by doubling the first dark-time than by doubling the first light-time. In the case of doubling the first dark-time, reversal was repeated one week after completion of the phase shift. The animal required 7.7+1.3 days for the first reversal and 8.7±3.8 days for the second to shift to the new dark period. This indicates that the phase shift does not occur more easily in second reversal, by which light-dark cycle returns normal (7: 00-19: 00 light, 19: 00-7: 00 dark), than in the first reversal.
社団法人日本動物学会の論文
1985-10-15

Circadian Rhythms in Locomotor Activity in the Hagfish, Eptatretus burgeri, and the Effect of Reversal of Light-Dark Cycle(Behavior Biology)

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