基于角质颚碳氮稳定同位素探索茎柔鱼地理种群连通性及其洄游

刘必林; 陈新军; 钱卫国; 金岳; 李建华

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Liu Bilin,Chen Xinjun,Qian Weiguo,Jin Yue,Li Jianhua.δ¹³C and δ¹⁵N in Humboldt squid beaks: understanding potential geographic population connectivity and movement[J].Acta Oceanologica Sinica,2019,38(10):53-59

基于角质颚碳氮稳定同位素探索茎柔鱼地理种群连通性及其洄游

δ¹³C and δ¹⁵N in Humboldt squid beaks: understanding potential geographic population connectivity and movement

投稿时间：2018-05-23

DOI：10.1007/s13131-019-1487-2

基金项目:The Shanghai Pujiang Program under contract No. 18PJ1404100; the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning under contract No. 0810000243; the National Natural Science Foundation of China under contract Nos 41306127 and 41276156.

作者	单位	E-mail
刘必林	上海海洋大学海洋科学学院, 上海 201306 国家远洋渔业工程技术研究中心, 上海 201306 大洋渔业资源可持续开发教育部重点实验室, 上海 201306
陈新军	上海海洋大学海洋科学学院, 上海 201306 国家远洋渔业工程技术研究中心, 上海 201306 大洋渔业资源可持续开发教育部重点实验室, 上海 201306 青岛海洋科学与技术国家实验室海洋渔业科学与食物产出过程功能实验室, 青岛 266237	xjchen@shou.edu.cn
钱卫国	上海海洋大学海洋科学学院, 上海 201306 国家远洋渔业工程技术研究中心, 上海 201306 农业部大洋渔业开发重点实验室, 上海 201306
金岳	上海海洋大学海洋科学学院, 上海 201306
李建华	上海海洋大学海洋科学学院, 上海 201306 农业农村部大洋渔业资源环境科学观测实验站, 上海 201306

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中文摘要:

本文分析了2009、2010和2013年期间采集于哥斯达黎加、厄瓜多尔、秘鲁和智利外海的茎柔鱼的角质颚下颚的δ¹³C和δ¹⁵N含量。各海区的稳定同位素含量反应了不同海区背景值的不同，海区间稳定同位素含量差异显著，其中厄瓜多尔外海最低，智利外海最高。δ¹³C和δ¹⁵N散点图显示，尽管秘鲁海区的同位素值与哥斯达黎加和智利的存在一定的重叠，但是δ13C和δ15N值可明显将各海区的样本明显分开。哥斯达黎加、厄瓜多尔和智利外海样本的δ¹³C和δ¹⁵N值分布相对集中以及三海区之间的δ¹³C和δ¹⁵N值差异显著说明，采自哥斯达黎加、厄瓜多尔和智利外海的茎柔鱼样本属于不同地理群体，它们的产卵起源不同，各自在相对狭小的地理区域内移动，相互之间没有种群交流。与之相比，δ¹³C和δ¹⁵N值变化范围广说明，秘鲁外海茎柔鱼样本的幼体是来自不同海区，经理不同的移动路线和索饵场。秘鲁和智利外海茎柔鱼样本的同位素值存在一定的重叠可能是由于两者之间存在一定的种群交流所致。总体来说，通过分析茎柔鱼角质颚稳定同位素的空间差异有助于我们了解其不同地理种群的迁徙策略以及相互之间的连通性。

英文摘要:

We quantified the δ¹³C and δ¹⁵N values in the lower beaks of Humboldt squid, Dosidicus gigas, collected from international waters off Costa Rica, Ecuador, Peru and Chile by Chinese squid jigging vessels during 2009, 2010 and 2013. There was a significant difference in the isotopic values among regions with the lowest value off Ecuador and the highest off Chile, which were interpreted as a function of trophic effects as well as baseline values. However, constant trophic level of D. gigas across its geographic range showed that spatial variation in the baseline of primary production is the main driver responsible for the observed geographic isotope variability. Inter-regional difference and intra-regional convergence of isotope values indicated squid off Costa Rica, Ecuador and Chile belong to different geographically segregated populations, which were previously proved by integrated population identifying method. In contrast, the higher variations in δ¹³C and δ¹⁵N values in a given size group suggest the squid off Peru move and forage in different places. Moreover, potential population exchange could be responsible for the overlap of the isotope values between the squid off Peru and off Chile. On the whole, the spatial difference in isotopic values of Humboldt squid beaks improves our understanding of potential geographic population connectivity and movement.

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