Last Kim S, Bailhache Thierry, Kramer Cas, Kyriacou Charalambos P, Rosato Ezio, Olive Peter J W
The Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, UK.
Chronobiol Int. 2009 Feb;26(2):167-83. doi: 10.1080/07420520902774524.
The burrow emergence activity of the wild caught ragworm Nereis virens Sars associated with food prospecting was investigated under various photoperiodic (LD) and simulated tidal cycles (STC) using a laboratory based actograph. Just over half (57%) of the animals under LD with STC displayed significant tidal (approximately 12.4 h) and/or lunar-day (approximately 24.8 h) activity patterns. Under constant light (LL) plus a STC, 25% of all animals were tidal, while one animal responded with a circadian (24.2 h) activity rhythm suggestive of cross-modal entrainment where the environmental stimulus of one period entrains rhythmic behavior of a different period. All peaks of activity under a STC, apart from that of the individual cross-modal entrainment case, coincided with the period of tank flooding. Under only LD without a STC, 49% of the animals showed nocturnal (approximately 24 h) activity. When animals were maintained under free-running LL conditions, 15% displayed significant rhythmicity with circatidal and circadian/circalunidian periodicities. Although activity cycles in N. virens at the population level are robust, at the individual level they are particularly labile, suggesting complex biological clock-control with multiple clock output pathways.
利用基于实验室的活动记录仪，在各种光周期（LD）和模拟潮汐周期（STC）条件下，研究了野生捕获的沙蚕Nereis virens Sars与觅食相关的洞穴出现活动。在有STC的LD条件下，略超过一半（57%）的动物表现出显著的潮汐（约12.4小时）和/或太阴日（约24.8小时）活动模式。在持续光照（LL）加STC的条件下，所有动物中有25%表现出潮汐活动，而有一只动物表现出昼夜节律（24.2小时）活动节律，这表明存在跨模式夹带，即一个周期的环境刺激夹带了另一个不同周期的节律行为。在STC条件下，除了个别跨模式夹带的情况外，所有活动高峰都与水箱注水期一致。在只有LD而没有STC的条件下，49%的动物表现出夜间（约24小时）活动。当动物在自由运行的LL条件下饲养时，15%的动物表现出具有潮汐和昼夜/太阴日周期性的显著节律性。尽管N. virens在种群水平上的活动周期很强，但在个体水平上它们特别不稳定，这表明存在复杂的生物钟控制，具有多个生物钟输出途径。
