明暗周期に伴うヌタウナギ遊泳活動リズムの同調性〔英文〕

概要

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Locomotor activity rhythms in the hagfish Eptatretus burgeri were recorded by use of an electronic photo-switch system. The activity in the hagfish occurred in the dark period of a 12L:12D cycle even if the cycle was reversed.Entrainability of the activity rhythm to the reversed LD cycle was also measured under dim light intensities of the light period. Defective phase-formations were produced when the light intensity fell as low as 5.96×10-3lx. The activity phase was no longer entrained by the LD cycle in the intensity of 2.53×10-3lx. It is estimated that the light intensities used in the experiments occur at depths of 100-150m of Sagami Bay, which the hagfish inhabits in summer. Thus, an external LD cycle, even with such dim light, might regulate locomotor activity in the hagfish under natural conditions.
日本水産學會の論文