Locomotor activity rhythm in the Japanese eel Anguilla japonica elvers

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	Locomotor activity rhythm in the Japanese eel Anguilla japonica elvers
	Dou Shuozeng ; Tsukamoto, Katsumi
刊名	ACTA OCEANOLOGICA SINICA
	2007
卷号	26 期号:5 页码:76-89
关键词	Activity Rhythm Japanese Eel Light-dark Cycle Temperature Zeitgeber
ISSN号	0253-505X
文献子类	Article
英文摘要	Under artificial LD cycles (6, 12, 18 L), the elvers of Japanese eel, Anguilla japonica, showed a 24 h cycle of locomotor activity rhythm being most active at light transitions: the eels' activity rose to a primary peak after lights-off, followed by a quiescent period during which they buried into the shelters or lying motionlessly on sand for most of the time, and then reached a secondary peak before lights-on. Elvers could resynchronize their activity rhythm with a new photo cycle within 4 d. Moreover, their activity level at dark phase significantly increased as the light period was prolonged: higher activity levels during shorter dark period. However, the elvers did not display clearly the existence of a circadian rhythm under constant light or dark conditions. The timing of daily activity rhythm evidenced in the Japanese eels may occur through the action of the LD cycles with a weak participation of an endogenous circadian system. In all the LD cycles, over 99% of the activity occurred in the dark phase, indicating that the eels were always nocturnally active no matter what time of day it might be. Under 12 L conditions, the eels' activity level and the time outside sand were significantly elevated both at light and dark phases as temperature increased from 10 similar to 15 to 20 similar to 25 degrees C. The activity rhythm pattern (i.e., two peaks occurring around light transitions) did not apparently change among temperatures. However, in contrast with the primary activity peaks immediately after lights-off at 20 and 25 degrees C, the timing of the primary peaks at 10 and 15 degrees C showed a latency of a few hours following lights-off, indicating the inhibiting effect of low temperature on the eels' activity.; Under artificial LD cycles (6, 12, 18 L), the elvers of Japanese eel, Anguilla japonica, showed a 24 h cycle of locomotor activity rhythm being most active at light transitions: the eels' activity rose to a primary peak after lights-off, followed by a quiescent period during which they buried into the shelters or lying motionlessly on sand for most of the time, and then reached a secondary peak before lights-on. Elvers could resynchronize their activity rhythm with a new photo cycle within 4 d. Moreover, their activity level at dark phase significantly increased as the light period was prolonged: higher activity levels during shorter dark period. However, the elvers did not display clearly the existence of a circadian rhythm under constant light or dark conditions. The timing of daily activity rhythm evidenced in the Japanese eels may occur through the action of the LD cycles with a weak participation of an endogenous circadian system. In all the LD cycles, over 99% of the activity occurred in the dark phase, indicating that the eels were always nocturnally active no matter what time of day it might be. Under 12 L conditions, the eels' activity level and the time outside sand were significantly elevated both at light and dark phases as temperature increased from 10 similar to 15 to 20 similar to 25 degrees C. The activity rhythm pattern (i.e., two peaks occurring around light transitions) did not apparently change among temperatures. However, in contrast with the primary activity peaks immediately after lights-off at 20 and 25 degrees C, the timing of the primary peaks at 10 and 15 degrees C showed a latency of a few hours following lights-off, indicating the inhibiting effect of low temperature on the eels' activity.
学科主题	Oceanography
语种	英语
WOS记录号	WOS:000251102700008
公开日期	2010-12-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/5327]
专题	海洋研究所_海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanog, Qingdao 266071, Peoples R China 2.Univ Tokyo, Ocean Res Inst, Tokyo 1648639, Japan
推荐引用方式 GB/T 7714	Dou Shuozeng,Tsukamoto, Katsumi. Locomotor activity rhythm in the Japanese eel Anguilla japonica elvers[J]. ACTA OCEANOLOGICA SINICA,2007,26(5):76-89.
APA	Dou Shuozeng,&Tsukamoto, Katsumi.(2007).Locomotor activity rhythm in the Japanese eel Anguilla japonica elvers.ACTA OCEANOLOGICA SINICA,26(5),76-89.
MLA	Dou Shuozeng,et al."Locomotor activity rhythm in the Japanese eel Anguilla japonica elvers".ACTA OCEANOLOGICA SINICA 26.5(2007):76-89.