Relationship Between Daily Variation of Locomotor Activity and That of Plasma Corticosterone Levels in the Newt, Cynops pyrrhogaster pyrrhogaster : Behavior Biology

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The daily variation of locomotor activity and that of plasma corticosterone levels were investigated in the newt, Cynops pyrrhogaster pyrrhogaster. Under LD 12:12 (Light on 07:00, off 19:00), the newts were active chiefly during the light period, and the daily variation of locomotor activity clearly showed a biphasic pattern. Plasma corticosterone levels increased during the dark period and reached a maximum value just prior to the light period just as is observed in diurnal mammals. The daily variation of plasma corticosterone levels also showed a biphasic pattern and virtually paralleled that of locomotor activity. If the light-dark cycle was reversed (Light on 19:00, off 07:00) by doubling the first light period, the daily patterns of both locomotor activity and of plasma corticosterone levels were also reversed within 7days. These results suggest that, in the newt, the daily variation of plasma corticosterone levels is closely associated with that of locomotor activity at least under the light-dark cycles of LD 12:12.
社団法人日本動物学会の論文
1987-06-15