| 基于脂肪酸标记法和稳定同位素技术的通州湾养殖水域海蜇食性分析 |
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| 引用本文： | 张健,王佚兮,冯慧敏,王陈星,唐议.基于脂肪酸标记法和稳定同位素技术的通州湾养殖水域海蜇食性分析[J].南方水产科学,2021(1). |
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| 作者姓名： | 张健 王佚兮 冯慧敏 王陈星 唐议 |
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| 作者单位： | 上海海洋大学海洋科学学院;上海海洋大学大洋渔业资源可持续开发教育部重点实验室/上海海洋大学国家远洋渔业工程技术研究中心/农业农村部大洋渔业开发重点实验室;上海海洋大学海洋文化与法律学院 |
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| 基金项目： | 国家自然科学基金项目(31001138);上海市农委海洋渔业限额捕捞指标评估专项。 |
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| 摘 要： | 海蜇(Rhopilema esculentum)是大型浮游动物,在海洋生态系统能量流动环节中起重要作用。文章采用脂肪酸生物标记法和碳、氮稳定同位素技术研究了通州湾养殖水域海蜇的食性及营养级。结果显示,对通州湾养殖水域海蜇共检测出29种脂肪酸,其中饱和脂肪酸(Saturated fatty acid,SFA)10种,单不饱和脂肪酸(Monounsaturated fatty acids,MUFA)8种,多不饱和脂肪酸(Polyunsaturated fatty acids,PUFA)11种。基于特征脂肪酸的食性分析,硅藻、陆源植物、植食性桡足类以及底栖生物是通州湾养殖水域海蜇的主要食物来源,海蜇对浮游细菌也存在摄食,具有杂食性。海蜇的二十二碳六烯酸(DHA)与二十碳五烯酸(EPA)的比值为0.78<1,这说明海蜇的营养级较低。海蜇的碳稳定同位素(δ13C)介于?23.54‰~?20.75‰,平均值为(?22.26±0.66)‰;氮稳定同位素(δ15N)介于8.39‰~9.85‰,平均值为(9.02±0.29)‰。经检验发现,海蜇伞径长与δ13C和δ15N的相关性并不显著(P>0.05),说明随着成体海蜇的生长,其营养级未发生明显变化。
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| 关 键 词： | 海蜇 食性 脂肪酸 碳氮稳定同位素 通州湾 |
Analysis of feeding habits of cultured jellyfish(Rhopilema esculentum)in Tongzhou Bay based on fatty acid and stable carbon and nitrogen isotopic analysis |
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| ZHANG Jian,WANG Yixi,FENG Huimin,WANG Chenxing,TANG Yi.Analysis of feeding habits of cultured jellyfish(Rhopilema esculentum)in Tongzhou Bay based on fatty acid and stable carbon and nitrogen isotopic analysis[J].South China Fisheries Science,2021(1). |
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| Authors: | ZHANG Jian WANG Yixi FENG Huimin WANG Chenxing TANG Yi |
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| Institution: | (College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;National Engineering Research Center for Oceanic Fisheries,Shanghai Ocean University/Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai Ocean University/Key Laboratory of Oceanic Fisheries Exploitation,Ministry of Agriculture and Rural Affairs,Shanghai 201306,China;College of Marine Culture and Law,Shanghai Ocean University,Shanghai 201306,China) |
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| Abstract: | Jellyfish(Rhopilema esculentum),as a large zooplankton,plays an essential role in the energy flow of marine ecosystems.In this study,we applied the fatty acid biomarker method and carbon and nitrogen stable isotope technique to investigate the diet and trophic level of cultured jellyfish in Tongzhou Bay.The results show that there were 29 kinds of fatty acids in jellyfish,including 10 kinds of saturated fatty acids(SFA),8 kinds of monounsaturated fatty acids(MUFA)and 11 kinds of polyunsaturated fatty acids(PUFA).The specific fatty acid analysis reveals that diatoms,terrestrial plants,herbivorous copepods and benthos dominated in the diet of cultured jellyfish in Tongzhou Bay,followed by planktonic bacteria.Besides,the DHA/EPA value was 0.78<1,which indicates that jellyfish had a lower trophic level.Theδ13C value ranged from?23.54‰to?20.75‰,with an average value of(?22.26±0.66)‰.The range ofδ15N was 8.39‰?9.85‰with an average value of(9.02±0.29)‰.No significant correlation is detected between the diameter of jellyfish andδ13C andδ15N(P>0.05),showing that there is no significant change in the trophic level along with the growth of adult jellyfish. |
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| Keywords: | Rhopilema esculentum Feeding habits Fatty acids Stable isotopes of carbon and nitrogen Tongzhou Bay |
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