Fanjul-Moles M L, Miranda-Anaya M, Prieto J
L. Neurofisiología Comparada, D.F., Mexico.
Chronobiol Int. 1996 May;13(1):15-26. doi: 10.3109/07420529609040838.
The characteristics of the circadian rhythm of locomotor activity in the crayfish Procambarus clarkii during ontogeny under constant darkness and light-dark (LD 12:12) conditions were studied in 132 juvenile crayfish, aged 10-140 days, divided in four groups. All animals were individually monitored with a motor activity recording system. Activity was quantitatively and qualitatively analyzed. All ages showed a circadian rhythm, although the probability of its appearance increased with age. Period values oscillated between 25.0 h in group I (2-4-week-old animals) and 24.3 h in group IV (16-20-week-old animals with more than 6 molts), but always with a high standard deviation. Groups II (5-10-week-old animals) and IV showed a statistically significant bimodal nonrandom synchrony of phases. The activity/ rest relationship diminishes as development progresses and is most uniform in group IV. We discuss the possibility that the pacemaker system responsible for this rhythm might be present from the moment of eclosion, but the coupling strength of this system with the effectors might change along development. The results presented in this work seem to indicate that the central pacemakers responsible for the activity and the ERG rhythm are not the same.
在持续黑暗和明暗交替（LD 12:12）条件下，对132只10至140日龄的克氏原螯虾幼体进行分组研究，探讨其个体发育过程中运动活动昼夜节律的特征。所有动物均通过运动活动记录系统进行个体监测。对活动进行了定量和定性分析。所有年龄段的个体均表现出昼夜节律，尽管其出现的概率随年龄增加。周期值在第一组（2至4周龄动物）的25.0小时至第四组（16至20周龄且蜕皮超过6次的动物）的24.3小时之间波动，但标准差始终较高。第二组（5至10周龄动物）和第四组表现出具有统计学意义的双模态非随机相位同步。随着发育进程，活动/休息关系减弱，在第四组中最为一致。我们讨论了负责这种节律的起搏器系统可能在孵化时就已存在，但该系统与效应器的耦合强度可能会随发育而变化的可能性。这项工作的结果似乎表明，负责活动和ERG节律的中央起搏器并不相同。
