Entrainment of Cricket Circadian Activity Rhythm after 6-Hour Phase-Shifts of Light-Dark Cycle : Behavior Biology

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Adult crickets Gryllus bimaculatus show a circadian locomotor rhythm peaking early in the dark fraction of 12-h light to 12-h dark cycle (LD). Reentrainability of the locomotor rhythm to 6-h delayed or advanced LD was investigated in 68 crickets under a constant temperature of 26℃ with three different illumination levels, i.e. 10, 100 and 400lux. The LD was shifted by either lengthening or shortening of the light fraction. More cycles were needed for reentrainment in phase-advance than in phase-delay. Decrements of light intensity increased the cycles needed in both phase-delay and phase-advance. When the LD was shifted by 6-h in either direction, the LD masked the rhythm dependently on the phase of the rhythm, either inducing or inhibiting the activity; the strongest masking was observed in the subjective night. Interestingly, a second peak was developed to form a double peaked activity pattern after phase-shifting in 31 animals, more frequently when the illumination level was 10lux. The results are discussed mainly in relation to effects of LD on the circadian rhythm
社団法人日本動物学会の論文
1987-06-15