Wheel-running rhythms in Arvicanthis niloticus
Wheel-running rhythms in Arvicanthis niloticus
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DOI：
10.1016/s0031-9384(96)00407-6
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发表时间：
1997-03-01
影响因子：
2.9
通讯作者：
Smale, L
中科院分区：
文献类型：
--
作者：
Katona, C;Smale, L
研究了尼罗河草鼠Arvicanthis niloticus在不同光照条件下的轮跑行为，以表征该物种的昼夜节律。一系列的照明时间表被用来确定夹带的性质，6小时相移后的再夹带率，以及在恒定光（LL）和恒定暗（DD）的自由运行的节奏的稳定性。所有15个人都在黎明和黄昏时表现出活动高峰，11个人在灯亮时更有可能跑步，4个人在灯关时更有可能跑步。后者中有三只完全处于黄昏状态，但有一只表现出明显不同的相对夜间模式，在黑暗阶段仍保持活跃。暴露于6小时相位提前和延迟的所有7只动物在9天内重新进入两个班次。所有动物在LL和DD中均表现出稳定和精确的自由运行节律，并且LL中的周期长于无。LL中的活动期与非活动期的比率显著高于DD或LD条件。我们的结论是A.尼罗鱼主要表现出昼夜奔跑的节律，在黎明和黄昏前后出现活动高峰，它们的节律稳定而精确，对光照条件的变化反应迅速而可预测。(C)1997年爱思唯尔科学公司
Wheel-running behavior of the Nile grass rat, Arvicanthis niloticus, was studied under a variety of lighting conditions to characterize circadian rhythms in this species. A series of lighting schedules was used to determine the nature of entrainment, the rates of reentrainment after 6-h phase shifts, and the stability of free-running rhythms in constant light (LL) and constant dark (DD). All 15 individuals showed peaks of activity around dawn and dusk, 11 were more likely to run when lights were on and 4 were more likely to run when the lights were off. Three of the latter animals were completely crepuscular, but 1 showed a distinctly different and relatively nocturnal pattern, remaining active well into the dark phase. All 7 animals that were exposed to 6-h phase advances and delays reentrained to both shifts within 9 days. Stable and precise free-running rhythms were exhibited by all animals in LL and DD, and periods were longer in LL than no. The ratio of the active to the inactive phase was significantly higher in LL than in DD or LD conditions. We conclude that A. niloticus exhibit predominantly diurnal running rhythms, with peaks of activity occurring around dawn and dusk, and that their rhythms are stable and precise and respond rapidly and predictably to changes in lighting conditions. (C) 1997 Elsevier Science Inc.