Effect of temperature and photoperiod on maturation of Cephalothrix hongkongiensis(Nemertea: Palaeonemertea)

作     者：李应东 宋肖跃 张珊珊 朱林 孙世春 

作者机构：Institute of Evolution and Marine BiodiversityOcean University of China 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报（英文版）)

年 卷 期：2014年第32卷第4期

页      面：764-772页

核心收录：

学科分类：090504[农学-特种经济动物饲养（含：蚕、蜂等）] 0905[农学-畜牧学] 09[农学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.30970333 31172046) 

主　　题：temperature photoperiod gonad development reproduction Cephalothrix hongkongiensis Nemertea 

摘      要：The limited knowledge about the relationships between environmental factors and the maturation and reproductive seasonality of nemerteans is mostly obtained from field studies, and in many cases is conjectural. Few species have been studied under well-controlled laboratory conditions. In this work, the effects of temperature and photoperiod on gonad development and spawning of Cephalothrix hongkongiensis were observed by rearing worms under different temperatures and photoperiods. Worms reared at 4~C and 6~C showed no growth or gonadal development, and all died within 109 days. At 8~C and 12~C, gonads could be seen from 90 days to the termination of the 360-day experiment, but no spawning was observed. Worms maintained at 16, 24, and 28~C showed both gonadal development and spawning, and matured faster at higher temperatures. Under a fixed temperature （16℃）, photoperiod did not have any significant impact on maturation and spawning. It is likely that temperature plays a major role in regulating the maturation and reproductive cycle of C. hongkongiensis.