| The influence of lipid-extraction on the δ13C of mesopelagic and demersal fish in the South China Sea: modification and application of lipid normalization models |
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| 作者姓名： | Linyu Wang Fuqiang Wang Zuozhi Chen Ying Wu |
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| 作者单位： | 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University;2. Pilot National Laboratory for Marine Science and Technology (Qingdao);3. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences |
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| 摘 要： | Mesopelagic fish,the most important daily vertically migrating community in the oceans,are characterized by high lipid content which may obscure the interpretation of stable isotopes analysis.Demersal fish,which are important consumers in the food web dominated by mesopelagic fish,also have a high lipid content.Here we collected 127 fish samples from the South China Sea and evaluated the effect of lipid contents on δ13C of mesopelagic and demersal fish.In lipid-extracted mesopelagic f...
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| 关 键 词： | mesopelagic fish demersal fish lipid normalization model C/N content ratio lipid content δ13C South China Sea |
The influence of lipid-extraction on the δ13C of mesopelagic and demersal fish in the South China Sea: modification and application of lipid normalization models |
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| Linyu Wang,Fuqiang Wang,Zuozhi Chen,Ying Wu.The influence of lipid-extraction on the δ13C of mesopelagic and demersal fish in the South China Sea: modification and application of lipid normalization models[J].Acta Oceanologica Sinica,2023,42(1):35-43. |
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| Authors: | Linyu Wang Fuqiang Wang Zuozhi Chen Ying Wu |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China2.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China3.South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 100141, China |
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| Abstract: | Mesopelagic fish, the most important daily vertically migrating community in the oceans, are characterized by high lipid content which may obscure the interpretation of stable isotopes analysis. Demersal fish, which are important consumers in the food web dominated by mesopelagic fish, also have a high lipid content. Here we collected 127 fish samples from the South China Sea and evaluated the effect of lipid contents on δ13C of mesopelagic and demersal fish. In lipid-extracted mesopelagic fish, the C/N content ratio (<5.5) shows a clear correlation with Δδ13C (the offset of bulk and lipid-extracted δ13C values), especially in non-migratory and semi-migratory species; these values were less correlation in demersal fish. Based on our results, we suggest that mesopelagic and demersal fish in different regions of the South China Sea should be studied separately using appropriate correction models and less fit for the traditional model. Moreover, the C/N content ratio should be used cautiously for establishing the lipid normalization model, especially for the fish in migratory mesopelagic fish and demersal fish. Our results also reveal that mesopelagic fish across nearby regions could be analyzed together. The new models described here can be applied in future studies of mesopelagic and demersal fish in the South China Sea. |
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| Keywords: | mesopelagic fish demersal fish lipid normalization model C/N content ratio lipid content δ13C South China Sea |
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