Inter-individual variation in trophic history of Dosidicus gigas,as indicated by stable isotopes in eye lenses  

作　　者：Wei Xu Xinjun Chen Bilin Liu Yong Chen Mengyao Huan Na Liu Jingyuan Lina 

机构地区：[1]College of Marine Sciences,Shanghai Ocean University,Shanghai,201306,China [2]National Engineering Research Center for Oceanic Fisheries,Shanghai,201306,China [3]The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai,201306,China [4]Key Laboratory of Oceanic Fisheries Exploration,Ministry of Agriculture,Shanghai,201306,China [5]Scientific Observing and Experimental Station of Oceanic Fishery Resources,Ministry of Agriculture,Shanghai,201306,China

出　　处：《Aquaculture and Fisheries》2019年第6期261-267,共7页渔业学报（英文）

基　　金：the English text of a draft of this manuscript.This work was sponsored by the Shanghai Pujiang Program(No.18PJ1404100);the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning,China(No.0810000243);the National Natural Science Foundation of China(Nos.41306127 and 41276156).

摘　　要：Isotopic signatures have been extensively used to reconstruct marine organism trophic habitat over their lifetime.In this study,sequential stable isotopic values ofδ13C andδ15N in eye lenses were measured to investigate the trophic history of Dosidicus gigas during ontogeny.A total of 281 segments from 33 lenses were examined withδ13C ranging from−20.17‰to−16.11‰andδ15N ranging from 5.15‰to 18.74‰.Sequential increasing but variableδ13C andδ15N values in eye lenses indicated that the prey used in the model had a wide range of values,it became able to consume prey from higher trophic levels,perhaps to maximize feeding success.High inter-individual differences in the range and considerable inter-individual variation in the trend of the isotopic values of the sequential segments from the nuclear to the periphery were considered to be the result of the effects of food and the best feeding strategy.These inter-individual isotopic differences in the life history of D.gigas confirmed the high degree of plasticity of feeding for this squid and its high potential to adapt to environmental change.Inter-individual differences ofδ15N values in the growth of D.gigas were more likely to be caused by differences in the baseline values of isotopes.According to the population discrimination model ofδ15N value changes during ontogeny,the D.gigas off Peru fit the model of“generalist population-generalist individuals”.

关 键 词：Dosidicus gigas Stable isotope Eye lenses Trophic habitat 

分 类 号：O57[理学—粒子物理与原子核物理]