Trophic Interactions of Mesopelagic Fishes in the South China Sea Illustrated by Stable Isotopes and Fatty Acids
文献类型： 外文期刊
作者： Wang, Fuqiang 1 ; Wu, Ying 1 ; Chen, Zuozhi 2 ; Zhang, Guosen 1 ; Zhang, Jun 2 ; Zheng, Shan 3 ; Kattner, Gerhard 4 ;
作者机构： 1.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China
2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Jiao Zhou Bay Marine Ecosyst Res Stn, Qingdao, Peoples R China
4.Alfred Wegener Inst, Helmholtz Ctr Polar & Marine, Bremerhaven, Germany
关键词： mesopelagic fishes; delta C-13(extraction); delta N-15; fatty acids; delta C-13 of individual fatty acids; South China Sea
期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：4.912； 五年影响因子：5.125 ）
ISSN：
年卷期： 2019 年 5 卷
页码：
收录情况： SCI
摘要： As the most abundant fishes and the least investigated components of the open ocean ecosystem, mesopelagic fishes play an important role in biogeochemical cycles and hold potentially huge fish resources. There are major gaps in our knowledge of their biology, adaptations and trophic dynamics and even diel vertical migration (DVM). Here we present evidence of the variability of ecological behaviors (migration and predation) and trophic interactions among various species of mesopelagic fishes collected from the South China Sea indicated by isotopes (delta C-13, delta N-15), biomarker tools [fatty acids (FAs), and compound- specific stable isotope analysis of FAs (CSIA)]. Higher lipid contents of migrant planktivorous fishes were observed with average values of 35%, while others ranged from 22 to 29.5%. These high lipids contents limit the application of delta C-13(bulk) (bulk-tissue delta C-13) as diet indicator; instead delta C-13(extraction) (the lipid extracted delta C-13) values were applied successfully to reflect dietary sources. The delta N-15 values of non-migrant planktivorous and piscivorous fishes varied in a narrow range (10.0-10.8 parts per thousand). This small difference may be caused by the low temperature in deep ocean, which results in low metabolic rates of nitrogen. The piscivorous fishes had higher FA ratios of DHA (22:6n-3)/EPA (20:5n-3) than planktivorous fishes, which mirrored their potential carnivory. CSIA can reveal small changes in biochemical composition and distinguishes between possible dietary sources such as between the non-migrant piscivorous and the semi-migrant piscivorous fishes with significantly different delta C-13 values of the 20:4n-6 and 20:5n-3 FAs (p < 0.01). Mesopelagic fishes exhibit complex trophic interactions revealed by molecular and CSIA tools and play a vital role in the marine "biological pump." This knowledge is important to comprehensively evaluate the role of mesopelagic fishes in global carbon budgets.
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