Effects of Light and Food as Zeitgebers on Locomotor Activity Rhythms in the Loach, Misgurnus anguillicaudatus
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概要
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Four experiments were performed to examine the synchronizing effects of light and food on the locomotor activity rhythm in the loach (Misgurnus anguillicaudatus). In Exp. 1, food was given once a day at the scheduled time in the middle of light (L) or dark (D) phase under LD 12 : 12. When the fish were fed in the L phase, they showed three types of activity pattern (light-active, dark-active and light-dark-active). On the other hand, most of the fish became dark-active when they were fed in the D phase. In both conditions, the fish were entrained well to the scheduled feeding. In Exp. 2, the scheduled feeding cycle was removed from the previous Exp. 1. Under these conditions, the loach remained to show the same pattern as that in Exp. 1 or tended to become dark-active. The feeding-anticipatory activity peak gradually disappeared during these experiments. In Exp. 3, the fish were exposed to the scheduled feeding and constant darkness (DD). Since almost all fish were entrained to the scheduled feeding, scheduled feeding as well as LD cycles is effective as a zeitgeber for the locomotor activity rhythm in the loach. Under constant conditions (Fig. 4), free-running rhythms were observed, although the duration of the rhythm was short and the ratio of the individuals that showed free-running rhythms was low (7-50%). Therefore, the locomotor activity rhythm in the loach is an endogenous rhythm but the coupling between the oscillator and the locomotor activity seems to be weak and different depending on individuals.
- 社団法人日本動物学会の論文
- 1994-02-15
著者
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Oishi Tadashi
Department Of Biology Faculty Of Science Nara Women's University
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Naruse Mayumi
Division Of Human Life And Environmental Science Graduate School Of Human Culture
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Oishi Tadashi
Department Of Biological Sciences Faculty Of Science Nara Women's University
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