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

Chinese Journal of Oceanology and Limnology 2014年第4期32卷 764-772页

作者：李应东宋肖跃张珊珊朱林孙世春 Institute of Evolution and Marine Biodiversity Ocean University of China

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.

关键词： temperature photoperiod gonad development reproduction cephalothrix hongkongiensis Nemertea

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Variations of antioxidant enzyme activity and malondialdehyde content in nemertean cephalothrix hongkongiensis after exposure to heavy metals

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Chinese Journal of Oceanology and Limnology 2010年第4期28卷 917-923页

作者：吴海一赵夕旦孙世春 Marine Culture Research Laboratory Ocean University of China College of Marine Life Sciences Ocean University of China

The antioxidant enzyme activity and malondialdehyde(MDA) content of cephalothrix hongkongiensis were studied to assess variations in the biochemical/physiological parameters of nemerteans under heavy metal *** were exposed to copper,zinc and cadmium solutions at different concentrations,and the activity of three antioxidant enzymes,catalase(CAT),superoxide dismutase(SOD),and glutathione peroxidase(GPX),and MDA content were *** results show that the activity of each enzyme changed immediately after exposure to heavy *** was invariably inhibited throughout the experimental period,while the SOD activity was significantly elevated by exposure to Cu^(2+) for 48h,but then *** was inhibited by Zn^(2+) during the first 12h of exposure,but activated when exposed for longer *** Cd^(2+) stress,SOD activity decreased within *** activity varied greatly,being significantly increased by both Cu^(2+) and Zn^(2+),but significantly inhibited by Cd^(2+) in the first 12-24h after *** content increased on Cu^(2+) exposure,but normally decreased on Zn^(2+) *** content followed an increase-decrease-increase pattern under Cd^(2+) *** conclusion,the antioxidant system of this nemertean is sensitive to heavy metals,and its CAT activity may be a potential biomarker for monitoring heavy metal levels in the environment.

关键词： cephalothrix hongkongiensis catalase superoxide dismutase glutathione peroxidase malondialdehyde heavy metal

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