| 引用本文: | 宁加佳,杜飞雁,王雪辉,谷阳光,王亮根,李亚芳.基于稳定同位素的六指马鲅(Polynemus sextarius)食性特征.海洋与湖沼,2015,46(4):758-763. |
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| 基于稳定同位素的六指马鲅(Polynemus sextarius)食性特征 |
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宁加佳1,2,3, 杜飞雁1,2,3, 王雪辉1,2,3, 谷阳光1,2,3, 王亮根1,2,3, 李亚芳1,2,3
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1.广东省渔业生态环境重点实验室 广州 510300;2.农业部南海渔业资源开发利用重点实验室 广州 510300;3.中国水产科学研究院南海水产研究所 广州 510300
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| 摘要: |
| 利用稳定同位素方法对南海大鹏湾海域六指马鲅(Polynemus sextarius)及其食物的碳和氮稳定同位素比值(δ13C和δ15N值)进行分析, 定量研究了不同食物对六指马鲅的贡献比率, 研究结果表明: 六指马鲅的δ13C值在-16.9‰--16.1‰间, δ15N值的范围为14.0‰-15.4‰, δ13C和δ15N值的变化范围均较小, 表明六指马鲅的食物来源较为单一。六指马鲅的食物主要由近缘新对虾(Metapenaeus affinis)、口虾蛄(Oratosquilla oratoria)、桡足类和蟹类组成, 它们的营养位置分别为2.97±0.21、3.18±0.08、1.82±0.08和2.53±0.66, 均低于六指马鲅的3.34±0.13。其中蟹类为六指马鲅的主要食物, 平均贡献率为50.8%;其次为口虾蛄和近缘新对虾, 平均贡献率分别为24.9%和17.0%;桡足类的平均贡献率最低, 仅为7.3%。相关分析显示, 六指马鲅的δ13C和δ15N值与其个体体长间均存在显著的正相关关系, 说明不同大小的六指马鲅食物组成有差异。 |
| 关键词: 六指马鲅(Polynemus sextarius) 食性 营养位置 碳和氮稳定同位素 |
| DOI：10.11693/hyhz20141100330 |
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| 基金项目:中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院南海水产研究所)项目,2014TS02号,2014TS22号;广东省自然科学基金项目,2014A030310232号。 |
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| FEEDING HABITS OF SIXFINGER THREADFIN POLYNEMUS SEXTARIUS REVEALED IN STABLE ISOTOPE ANALYSIS |
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NING Jia-Jia1,2,3, DU Fei-Yan1,2,3, WANG Xue-Hui1,2,3, GU Yang-Guang1,2,3, WANG Liang-Gen1,2,3, LI Ya-Fang1,2,3
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1.Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China;2.Key Laboratory of South China Sea Fishery Resources Development and Utilization, Ministry of Agriculture, Guangzhou 510300, China;3.South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China
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| Abstract: |
| We analyzed carbon and nitrogen stable isotope ratios (δ13C and δ15N) in Polynemus sextarius and their preys in Mirs Bay, South China Sea, to study food composition of the fish.The results show that, the average δ13C and δ15N values of the fish was (-16.5±0.2)‰ and (14.6±0.5)‰, in range of (-16.9--16.1)‰ and (14.0-15.4)‰, respectively.Preys of P.sextarius were Metapenaeus affinis, Oratosquilla oratoria, copepods, and crabs.The average trophic position of P.sextarius was 3.34±0.13, on top of all their preys.Crabs were the most important prey of P.sextarius by taking 20%-81% (50.8% in average) of the total food sources, followed by O.oratoria (0-82%, average 24.9%), M.affinis (0-57%, average 17.0%) and copepods (0-26%, average 7.3%).Statistical analyses revealed significant positive correlation between the body length and δ13C or δ15N value in P.sextarius, indicating that the body size affected the feeding habits of P.sextarius. |
| Key words: Polynemus sextarius feeding habits trophic position carbon and nitrogen stable isotopes |
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