上海海洋大学学报2025，Vol.34Issue(2)：365-371,7.DOI:10.12024/jsou.20241004655
中东太平洋赤道海域茎柔鱼营养模式年间差异分析
Inter-annual variations in the trophic pattern of jumbo squid Dosidicus gigas from the Central Eastern Pacific Ocean
摘要
Abstract
To explore the changing patterns of the dietary habits and migratory patterns of the jumbo squid(Dosidicus gigas)and their potential relationship with abnormal climate events and variations in fishing intensity.In this study,we selected D.gigas from the Central Eastern Pacific Ocean as research object,and evaluated the sequentialstable isotope values of δ13C and δ15N in sectioned fragments of gladius.Using climate and environmental indices,the inter-annual variations in the ontogenictrophic patterns of the D.gigas were compared and their causes were explored.The results indicated that the δ13C values of 2019 D.gigas gladius significantly increased with individual growth,and the trophic niche narrowed,which may be related to the migration from equator to the southern hemisphere after the El Niño occurred.Differences were also found in the trophic patterns of the D.gigas collected in the La Niña periods,i.e.,2018,2020,and 2021.In 2018,the δ13C and δ15N value of D.gigas gladius significantly increased with individual growth,indicating a southward migration to higher latitudes in the Southern Hemisphere.However,there was no significant change in the trophic niche,suggesting a relatively stable food source for D.gigas.During the implementation of seasonal moratorium in the high seas in 2020 and 2021,there were no significant changes in δ13C and δ15N values with individual growth,while higher trophic niche width during the later stages of life span.This indicated that these individuals had narrow migratory range,stabledietary,and high ecological resilience.These findings illustrate the sensitivity of D.gigas to abnormal climatic events and variation of fishing intensity.However,further research is needed to determine the extent of each factor's influence.关键词
茎柔鱼/营养生态位/稳定同位素/厄尔尼诺/拉尼娜Key words
Dosidicus gigas/trophic ecology/stable isotope/El Niño/La Niña分类
农业科技引用本文复制引用
樊庆王,葛钰婧,李纲,陈新军,贡艺..中东太平洋赤道海域茎柔鱼营养模式年间差异分析[J].上海海洋大学学报,2025,34(2):365-371,7.基金项目
国家自然科学基金项目(31900333) （31900333）
农业农村部远洋渔业公海自主休渔效果评价与优化专项(D-8021-21-0049) （D-8021-21-0049）
