水生生物学报2026，Vol.50Issue(7)：102-111,10.DOI:10.3724/1000-3207.2025.2025.0332
基于稳定同位素的柘林水库主要鱼类营养生态位研究
STUDY ON TROPHIC NICHE OF MAIN FISH SPECIES IN ZHELIN RESERVOIR BASED ON STABLE ISOTOPES
摘要
Abstract
Deep-water reservoirs possess unique hydrological structures,leading to significant differences in food web construction mechanisms and energy flow patterns compared to natural lakes.To clarify the trophic structure characte-ristics of such systems,this study takes Zhelin Reservoir as the research area.Based on fish survey data from April and July 2021,carbon and nitrogen stable isotope techniques were employed to systematically analyze the trophic levels of fish and the characteristics and overlap patterns of trophic niches among different functional groups.The results show that in Zhelin Reservoir,the δ13C values from-33.51 ‰ to-17.90 ‰(-25.52 ‰±0.20 ‰),and the δ15N values from 5.96 ‰ to 16.97 ‰(13.00 ‰±0.20 ‰).The main fish trophic levels from 1.03 to 4.27(3.09±0.06).The omnivorous group occupies the core niche through broad-spectrum feeding(CR=15.61 ‰),but its high overlap rate with carnivo-rous groups(88%)intensifies community competition.The herbivorous group is resource-limited due to a single carbon source(CR=8.21‰).The study reveals that the food chain length in Zhelin Reservoir is relatively short,a characteris-tic closely related to seasonal variations in carbon sources and anthropogenic pressure.From the perspective of trophic niches,the findings elucidate the food web structure characteristics of deep-water reservoirs,where fish utilize diverse carbon sources but exhibit limited food chain lengths.This provides a scientific basis for understanding the energy flow mechanisms in artificial reservoirs and optimizing fishery resource management strategies.关键词
稳定同位素/营养生态位/生态位重叠/营养级/深水型水库Key words
Stable isotope/Trophic niche/Niche overlap/Trophic level/Deep-water reservoir分类
农业科技引用本文复制引用
毕龙龙,向邈,孟子豪,龚进玲,胡飞飞,李开飞,杨新宇,李学梅..基于稳定同位素的柘林水库主要鱼类营养生态位研究[J].水生生物学报,2026,50(7):102-111,10.基金项目
国家重点研发计划(2023YFD2400900) （2023YFD2400900）
财政部和农业农村部:国家现代农业产业技术体系(CARS-46) （CARS-46）
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(2023TD61) （2023TD61）
中央级公益性科研院所基本科研业务费专项资金(YFI202415和 YFI202418)资助[Supported by the National Key Research and Development Program of China(2023YFD2400900) （YFI202415和 YFI202418）
China Agriculture Research System of MOF and MARA(CARS-46) （CARS-46）
Central Public-interest Scientific Insti-tution Basal Research Fund,CAFS(2023TD61) （2023TD61）
Central Public-interest Scientific Institution Basal Research Fund(YFI202415 and YFI202418)] （YFI202415 and YFI202418）
