Circadian Rhythms in Locomotor Activity of the Hagfish, Eptatretus burgeri II. The Effect of Brain Ablation : Behavior Biology

概要

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The hagfish, Eptatretus burgeri, displays locomotor activity only during the first two thirds of the dark period under 12L: 12D (7:00-19:00 light, 19:00-7:00 dark), and shows a clear free-running rhythm under constant darkness. The altered activity in the animal, whose brain was surgically removed except for the medulla oblongata, assumed a peculiar pattern which can be described as follows: (1) The free-running rhythm in constant darkness disappeared. (2) Under 12L: 12D, motor activity in the dark period disappeared, and continuous activity was observed throughout the light period. (3) This continuous activity always appeared and remained throughout the light period in various light regimens and it seems to be a direct reaction to light.
社団法人日本動物学会の論文
1988-04-15