长江流域资源与环境 >> 2017, Vol. 26 >> Issue (12): 2091-.doi: 10.11870/cjlyzyyhj201712018

• 自然资源 • 上一篇    下一篇

长江靖江段近岸小型渔业生物 碳氮稳定同位素特征分析

俞雅文1,徐东坡2,王媛2,徐跑1,2*   

  1. (1.南京农业大学无锡渔业学院,江苏 无锡 214081;2.农业部长江下游渔业资源环境科学观测实验站,
    中国水产科学研究院淡水渔业研究中心, 江苏 无锡 214081)
  • 出版日期:2017-12-20

TROPHIC RELATIONSHIPS BASED ON SMALLSCALE FISHERIES #br# IN THE NEARSHORE ZONE OF JINGJIANG, YANGTZE RIVER:#br#  δ13C AND δ15N STABLE ISOTOPE ANALYSIS

YU Yawen1, XU Dongpo2, WANG Yuan2, XU Pao1,2   

  1. (1.Nanjing Agricultural University Wuxi Fisheries College, Wuxi 214081, China; 2. Scientific Observing and Experimental Station of
     Fishery Resources and Environment in the Lower Reaches of the Changjiang River, MoA,Freshwater Fisheries Research
    Center of Chinese Academy of Fishery Sciences,Wuxi 214081, China)
  • Online:2017-12-20

摘要: 长江靖江段是众多洄游性渔业生物的重要栖息地,为进一步的研究和渔业资源评估提供基础生物学资料、掌握该水域食物网结构特征,应用碳、氮稳定同位素技术测定了2016年8月在长江靖江段近岸采集的蟹类、小型鱼类、虾类等渔业生物样品的δ13C值和δ15N值,并由此构建了所采集的各类渔业生物的连续营养谱。结果表明:长江靖江段近岸各类生物中浮游动物的δ13C值最低,为 -30.34‰;其次是底栖碎屑的 -30.24‰;贝类、水生植物类、鱼类和虾类居中,它们的δ13C值均值分别为 -29.75‰±0.75‰、-28.98‰±0.88‰、-26.74‰±2.37‰、-26.1‰±0.16‰;蟹类最高,为-25.86‰±0.74‰。水生植物类的δ15N均值最低,为5.16‰±0.85‰;底栖碎屑其次,为5.58‰;贝类、鱼类、浮游动物和蟹类的δ15N值均居中,δ15N均值分别为8.13‰±0.31‰、11.56‰±1.59‰、12.02‰和12.51‰±1.43‰;虾类的δ15N均值最高,为13.05‰±0.45‰;营养级由低到高依次为:水生植物类、底栖碎屑、贝类、浮游动物、小型鱼类、蟹类和虾类。近岸水域的小型鱼类、蟹类和虾类拥有着比较接近的食物源,生态位重叠较为明显。

Abstract: Jingjiang section of Yangtze River is host to plenty of migratory fishes. For the sake of grasping the characteristics of food web structure in the nearshore zone of Jingjiang section, together with providing basic biological data for further study and fishery resource assessment, this study employed stable isotope technique of carbon and nitrogen to detect the δ13C and δ15N values of each biological sample collected there in August 2016 and constructed the continuous trophic spectrum of crabs, small fishes, shrimps and other fishery creatures. As the results revealed, the δ13C value of zooplankton was -30.34‰ and the lowest, followed by the benthic clastic of -30.24‰. The average δ13C values of shellfish, aquatic plants, small fishes and shrimps were -29.75‰±0.75‰, -28.98‰±0.88‰, -26.74‰±2.37‰ and -26.1‰±0.16‰, respectively. Crabs owned the highest δ13C value of -25.86‰±0.74‰. The δ15N value of aquatic plants was 5.16‰±0.85‰ and the lowest, and benthic clastic of 5.58‰ in the next place. The average δ15N values of shellfish, small fishes, zooplankton and crabs were 8.13‰±0.31‰, 11.56‰±1.59‰, 12.02‰ and 12.51‰±1.43‰, respectively. Shrimps possessed the highest δ15N value of 13.05‰±0.45‰. The order of trophic level was aquatic plants, benthic clastic, shellfish, zooplankton, small fish, crabs and shrimps from low to high. Small fishes, crabs and shrimps in this part of water area shared the similar food source while the stable isotope values suggested an obvious overlap in trophic niche among them.

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