The influence of lipid-extraction on theδ^(13)C of mesopelagic and demersal fish in the South China Sea:modification and application of lipid normalization models  

作　　者：Linyu Wang Fuqiang Wang Zuozhi Chen Ying Wu 

机构地区：[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai,200241,China [2]Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao,266237,China [3]South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Guangzhou,100141,China

出　　处：《Acta Oceanologica Sinica》2023年第1期35-43,共9页海洋学报（英文版）

基　　金：the National Natural Science Foundation of China under contract Nos 42090043 and 41876074;the National Basic Research Program(973 Program)of China under contract No.2014CB441502.

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△δ^(13)C of mesopelagic and demersal fish.In lipid-extracted mesopelagic fish,the C/N content ratio(<5.5)shows a clear correlation withΔδ^(13)C(the offset of bulk and lipid-extractedδ^(13)C 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.

关 键 词：mesopelagic fish demersal fish lipid normalization model C/N content ratio lipid content δ13C South China Sea 

分 类 号：S931[农业科学—渔业资源]