南海中西部渔场主要渔业生物碳氮稳定同位素特征
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摘要
南海中西部渔场是我国南海渔业开发的重点渔场之一。为了解该海域主要渔业生物的营养关系,应用碳、氮稳定同位素技术测定了该海域主要渔业生物样品的δ~(13)C和δ~(15)N值,由此构建该海域主要渔业生物的连续营养谱。结果显示,南海中西部渔场主要渔业生物同位素比值变化幅度较大,其中鱼类的δ~(13)C和δ~(15)N值范围分别为-20.00‰～-16.51‰和7.94‰～11.81‰;头足类的δ~(13)C和δ~(15)N值范围分别为-18.84‰～-17.60‰和10.10‰～12.85‰。以浮游动物为基线生物计算各物种相应的营养级,鱼类处于2.41～3.53,头足类处于3.03～3.84,头足类的平均营养级要高于鱼类。通过对不同体长(胴长)的鸢乌贼Symplectoteuthis oualaniensis、菱鳍乌贼Thysanoteuthis rhombus、红鳍圆鲹Decapterus russelli、细鳞圆鲹Decapterus lajang和黄鳍金枪鱼Thunnus albacares的营养级进行比较分析,结果发现,随着体长(胴长)增大其营养级有相应增大的趋势。研究初步建立了南海中西部渔场主要渔业生物营养级的连续营养谱,旨在为了解该海域食物网结构提供基础资料。
The central western South China Sea is one of the main fishing grounds for fishery development. To understand the trophic relationships of major fishery organisms of the central western South China Sea, stable isotope techniques were used to analyze and determine carbon and nitrogen stable isotope ratios of major fishery biological samples in the area. The trophic levels of the main fishery biota were calculated to construct a continuous trophic spectrum of the main fishery organisms in the area. These results show that the major fishery isotope ratios have a wide range of changes in the central western South China Sea. The δ~(13)C and δ~(15)N values of the fish ranged from-20.00‰ to-16.51‰ and from 7.94‰ to 11.81‰, respectively. The δ~(13)C and δ~(15)N values of the cephalopods ranged from-18.84‰ to-17.60‰ and from 10.10‰ to 12.85‰, respectively. The corresponding trophic levels of each species were calculated using zooplankton as the baseline organism. The trophic level of fish ranged from 2.41 to 3.53, and that of cephalopods ranged from 3.03 to 3.84. Among the organisms, the average trophic level of cephalopods is higher than that of fish. Comparison of trophic levels in different lengths(mantle length) of Symplectoteuthis oualaniensis, Thysanoteuthis rhombus, Decapterus russelli, Decapterus lajang, and Thunnus albacares reveals that the trophic level has a correspondingly increasing trend as body length increases. In this study, we preliminarily established the continuous trophic levels' spectrum of major fishery bio-nutritional levels in the central and western waters of the central western South China Sea, providing a theoretical basis for the food web structure and fishery resource utilization in the area.
The central western South China Sea is one of the main fishing grounds for fishery development. To understand the trophic relationships of major fishery organisms of the central western South China Sea, stable isotope techniques were used to analyze and determine carbon and nitrogen stable isotope ratios of major fishery biological samples in the area. The trophic levels of the main fishery biota were calculated to construct a continuous trophic spectrum of the main fishery organisms in the area. These results show that the major fishery isotope ratios have a wide range of changes in the central western South China Sea. The δ~(13)C and δ~(15)N values of the fish ranged from-20.00‰ to-16.51‰ and from 7.94‰ to 11.81‰, respectively. The δ~(13)C and δ~(15)N values of the cephalopods ranged from-18.84‰ to-17.60‰ and from 10.10‰ to 12.85‰, respectively. The corresponding trophic levels of each species were calculated using zooplankton as the baseline organism. The trophic level of fish ranged from 2.41 to 3.53, and that of cephalopods ranged from 3.03 to 3.84. Among the organisms, the average trophic level of cephalopods is higher than that of fish. Comparison of trophic levels in different lengths(mantle length) of Symplectoteuthis oualaniensis, Thysanoteuthis rhombus, Decapterus russelli, Decapterus lajang, and Thunnus albacares reveals that the trophic level has a correspondingly increasing trend as body length increases. In this study, we preliminarily established the continuous trophic levels' spectrum of major fishery bio-nutritional levels in the central and western waters of the central western South China Sea, providing a theoretical basis for the food web structure and fishery resource utilization in the area.
引文
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陶雅晋,莫檬,何雄波,等,2017.南海黄鳍金枪鱼(Thunnus albacores)摄食习性及其随生长发育的变化[J].渔业科学进展,38(4):1-10.TAO YAJIN,MO MENG,HE XIONGBO,et al,2017.Feeding habits and ontogenetic diet shifts of yellowfin tuna(Thunnus albacores)in the South China Sea[J].Progress in Fishery Sciences,38(4):1-10(in Chinese with English abstract).
王荦,杜双成,杨婷越,等,2017.应用稳定同位素技术评价大连近岸海域食物网营养结构[J].生态学杂志,36(5):1452-1457.WANG LUO,DU SHUANGCHENG,YANGTINGYUE,et al,2017.Using stable isotopes to evaluate food web structure in Dalian coastal water[J].Chinese Journal of Ecology,36(5):1452-1457(in Chinese with English abstract).
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闫光松,张涛,赵峰,等,2016.基于稳定同位素技术对长江口主要渔业生物营养级的研究[J].生态学杂志,35(11):3131-3136.YAN GUANGSONG,ZHANG TAO,ZHAOFENG,et al,2016,A study on trophic level of the major fishery species from the Yangtze Estuary based on stable isotope technology[J].Oceanologia et Limnologia Sinica,35(11):3131-3136(in Chinese with English abstract).
颜云榕,卢伙胜,金显仕,2011.海洋鱼类摄食生态与食物网研究进展[J].水产学报,35(1):145-153.YAN YUNRONG,LUHUOSHENG,JIN XIANSHI,2011,Marine fish feeding ecology and food web:progress and perspectives[J].Journal of Fisheries of China,35(1):145-153(in Chinese with English abstract).
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