西北太平洋桡足类稳定同位素特征及其影响因素  

Stable isotope signatures and driving factors of copepods from the northwest Pacific Ocean

作　　者：贡艺 梁茜 李云凯 刘必林 牛成功 GONG Yi;LIANG Qian;LI Yunkai;LIU Bilin;NIU Chenggong(College of Marine Sciences,Shanghai Ocean University,Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,National Engineering Research Center for Oceanic Fisheries,Key Laboratory of Oceanic Fisheries Exploration,Ministry of Agriculture and Rural Affairs,Shanghai 201306,China)

机构地区：[1]上海海洋大学海洋科学学院,国家远洋渔业工程技术研究中心,大洋渔业资源可持续开发教育部重点实验室,农业农村部大洋渔业开发重点实验室,上海201306

出　　处：《生态学杂志》2024年第2期505-513,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31900333);农业农村部全球渔业资源调查监测评估(公海渔业资源综合科学调查)专项资助。

摘　　要：浮游动物的碳、氮稳定同位素比值(δ^(13)C和δ^(15)N)能够反映海洋环境的变动,常用于建立稳定同位素基线。本研究以2019年3月(春季)和9月(秋季)在西北太平洋采集的桡足类为对象,结合其形态特征和采样海域的环境因子,探讨桡足类的稳定同位素特征及其影响因素。结果表明:春季桡足类个体的形态特征(体长、面积和体积)均显著高于秋季(P<0.05),两个季节的δ^(15)N值与形态特征均呈显著正相关,而δ^(13)C值只在春季呈显著正相关,可能是因为秋季采样点与日本岛距离相近而具有相似的碳源。广义加性模型(GAM)分析显示,桡足类δ^(13)C和δ^(15)N值的季节性差异主要与叶绿素a浓度和50 m层水温有关。本研究结果可为西北太平洋其他海洋生物的稳定同位素生态学研究提供基础资料。Stable carbon and nitrogen isotope values(δ13C andδ15N,respectively)of zooplankton can reflect environmental changes in marine and are commonly used to establish a stable isotopic baseline.In this study,copepods were collected from the northwest Pacific Ocean in March(spring)and September(autumn)of 2019.We investigated the impacts of morphological characteristics of copepods and environmental factors on stable isotopic values.The results showed that the morphological characteristics(length,area,and volume)of copepods were significantly higher in spring than that in autumn(P<0.05),and that theδ15N values were significantly positively correlated with morphological characteristics in both seasons.Forδ13C values,only copepods in spring had a significant positive correlation with morphological characteristics,probably due to the similar distances between sampling locations and Japan islands in autumn with similar carbon sources.Results of the generalized additive model(GAM)showed that the seasonal variations ofδ13C andδ15N values in copepods were mainly correlated to chlorophyll-a concentration and water temperature at 50 m depth.These findings provide basic information for further studies of stable isotope ecology of marine organisms in the northwest Pacific Ocean.

关 键 词：西北太平洋 浮游动物 稳定同位素 形态特征 环境因子 

分 类 号：Q958.8[生物学—动物学]