Circadian Rhythm of Locomotor Activity in a Teleost, Siluras asotus : Behavior Biology

概要

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Circadian locomotor activities were examined in the nocturnal catfish, Silurus asotus. Under constant darkness (DD), the overt rhythm of locomotor activity lasted, in most cases, for 5-10days, then disappeared. The ratio of fish with circadian activity under DD was higher (approximately 94%) than those under the other experimental conditions described below. Persistence of circadian activity for 5-10days and subsequent arrhythmicity were also found under constant light (LL). τ Value and total amount of locomotor activity tended to decrease with an increase in light intensity. Under the condition of dark pulses (DP), the circadian activity was observed but not prominent as those in DD. The participation of intrinsic rhythmicity on diel locomotor activity was examined by delaying and advancing the LD phases. Resynchronization to the new LD cycle was attained within 1-2days. In conclusion, the data suggest that, despite the high ratio of fish with intrinsic rhythmicity of locomotor activity, the timing mechanism for diel locomotor activity is fundamentally dependent on the external LD cycles.
社団法人日本動物学会の論文
1989-04-15