Photoperiod during Post-Embryonic Development Affects Some Parameters of Adult Circadian Rhythm in the Cricket, Gryllus bimaculatus : Behavior Biology
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概要
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Adult male cricket, Gryllus bimaculatus exhibits a nocturnal circadian locomotor rhythm but with a small activity peak at lights-on. Effect, on the adult locomotor rhythm, of the ratio of light to dark phase (L/D-ratio) of the 24hr light to dark (LD) cycle was investigated using animals reared under either of the three LD cycles, i.e. LD8:16, LD12:12 or LD16:8. Activity pattern differed from each other depending on the preceding LD conditions in which the animal was reared. The length of the noctumal activity phase which was about 12hr in the standard lighting condition, LD12:12, shortened to about 8hr in LD16:8 but never lengthened more than 12hr even in LD8:16 with the longest dark phase. This fact suggests that the maximal length of the nocturnal activity may be homostatically regulated to be 12hr. Some animals showed an enhanced lights-on peak which made activity pattern almost diurnal. The number of animal with the enhanced lights-on peak was greater in LDS other than LD12:12. In the constant darkness, freerunning periods and the ratio of the activity phase to the rest phase (α/ρ-ratio) were affected greatly by the preceding LD-ratio. Average freerunning period of the animal reared in LD16:8 was 24.49±0.49 (S.D.) hr, significantly longer than about 23.8hr of animals reared in other LDs. The α/ρ-ratio changed in inversely proportional to the L/D-ratio: 1.29±0.52 (S.D.), 0.94±0.28 (S.D) and 0.88±0.33 (S.D.) in LD8:16, LD12:12 and LD16:8, respectively. Possible physiological mechanisms and biological role of the lability in the cricket circadian rhythm are discussed.
著者
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Chiba Yoshihiko
Environmental Biology Laboratory Biological Institute Faculty Of Science Yamaguchi University
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Tomioka Kenji
Environmental Biology Laboratory Biological Institute Faculty Of Science Yamaguchi University
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