水生生物学报2025，Vol.49Issue(10)：16-25,10.DOI:10.3724/1000-3207.2025.2024.0475
三峡库区四种小型鱼类能量溯源及时空差异
ENERGY SOURCE TRACING OF FOUR SMALL-SIZED FISH AND SPATIOTEMPORAL DIFFERENCES IN THE THREE GORGES RESERVOIR AREA
摘要
Abstract
In order to evaluate food utilization and trophic transfer efficiency of the food chain in the Three Gorges Reservoir,stable carbon and nitrogen isotope methods were employed to investigate the spatiotemporal variations in the energy contribution of four fundamental carbon sources-phytoplankton,C3,C4 plants in the riparian zone,and epiphytic algae-to four dominant small-sized fish species,Squalidus argentatus,Saurogobio dabryi,Pseudobrama simoni,and Hemiculter leucisculus.The results indicated significant differences in the δ13C and δ15N values among different carbon source organisms,effectively distinguishing their fundamental carbon sources.The outcomes of the Bayesian mixed model suggested that phytoplankton contributes the highest proportion of energy to the four small fish species.At the hydrological scale,there is no significant difference in the contribution rates of autochthonous and allochthonous carbon sources to the four small fish(P>0.05).However,at the spatial scale,a highly significant difference was observed(P<0.01).This study indicate that autochthonous carbon is the primary energy source for small fish in the reservoir area,while the contribution of allochthonous carbon sources increases noticeably along the longitudinal gra-dient of the Three Gorges Reservoir.This may be associated with the characteristics of diverse submerged area and the increased sedimentation of exogenous carbon source particles in the quiescent water environment near the reservoir head.关键词
三峡库区/稳定同位素分析/小型鱼类/营养溯源/基础碳源Key words
Three Gorges Reservoir area/Stable isotope analysis/Small-sized fish species/Trophic tracing/Basal carbon source分类
生物科学引用本文复制引用
邓华堂,冉莉,薛洋,周春龙,陈大庆,段辛斌,田辉伍..三峡库区四种小型鱼类能量溯源及时空差异[J].水生生物学报,2025,49(10):16-25,10.基金项目
国家重点研发计划(2022YFC3202001) （2022YFC3202001）
国家自然科学基金(51909271、51509262和32060274) （51909271、51509262和32060274）
重庆市水产科技创新联盟(2021183) （2021183）
中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金(2023TD09)资助Supported by the National Key R&D Program of China(2022YFC3202001) （2023TD09）
the National Natural Science Foundation of China(51909271,51509262 and 32060274) （51909271,51509262 and 32060274）
Chongqing Aquatic Science and Technology Innovation Alliance(2021183) （2021183）
Central Public-interest Scientific Institu-tion Basal Research Fund,CAFS(2023TD09) （2023TD09）
