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引用本文:谢青,徐勤勤,王永敏,孙涛,樊宇飞,刘伟豪,王定勇.三峡水库与长寿湖水库鱼类碳、氮稳定同位素特征及营养级的比较.湖泊科学,2019,31(3):837-845. DOI:10.18307/2019.0321
XIE Qing,XU Qinqin,WANG Yongmin,SUN Tao,FAN Yufei,LIU Weihao,WANG Dingyong.Stable isotope value and trophic position of fishes in Three Gorges Reservoir and Changshou Reservoir. J. Lake Sci.2019,31(3):837-845. DOI:10.18307/2019.0321
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三峡水库与长寿湖水库鱼类碳、氮稳定同位素特征及营养级的比较
谢青1, 徐勤勤1, 王永敏1,2,3, 孙涛1, 樊宇飞1, 刘伟豪1, 王定勇1,2,3
1.西南大学资源环境学院, 重庆 400715;2.重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716;3.重庆市农业资源与环境研究重点实验室, 重庆 400716
摘要:
为探究人为活动对水库鱼类食物来源和营养级关系的影响,选择人为影响程度较低的三峡水库和影响程度较高的长寿湖水库为研究对象,应用碳、氮稳定同位素技术对两个水库鱼类δ13C值、δ15N值和营养级进行比较分析.结果显示:长寿湖水库鱼类δ13C平均值(-22.66‰±1.94‰)与三峡水库(-22.59‰±1.87‰)较为接近,但长寿湖鱼类的δ15N值(13.95‰ ±3.02‰)显著高于三峡水库鱼类的δ15N值(11.98‰ ±2.25‰).根据δ15N值计算不同食性鱼类间的营养级,三峡水库营养级为肉食性鱼类 > 杂食性鱼类 > 浮游生物食性鱼类 > 草食性鱼类;而长寿湖中则表现为浮游生物食性鱼类 > 肉食性鱼类 > 杂食性鱼类 > 草食性鱼类,营养级出现了异常现象.这一结果表明,对于人为影响(如人工喂食鱼饲料等)较大的水体,采用δ15N值计算不同食性鱼类间的营养级存在不确定性.
关键词:  碳、氮稳定同位素  营养级  三峡水库  长寿湖水库  鱼类
DOI:10.18307/2019.0321
分类号:
基金项目:国家自然科学基金项目(41373113,41603103)、中央高校基本科研业务费专项(XDJK2017B035)和国家重点基础研究发展计划“973”项目(2013CB430004)联合资助.
Stable isotope value and trophic position of fishes in Three Gorges Reservoir and Changshou Reservoir
XIE Qing1, XU Qinqin1, WANG Yongmin1,2,3, SUN Tao1, FAN Yufei1, LIU Weihao1, WANG Dingyong1,2,3
1.College of Resources and Environment, Southwest University, Chongqing 400715, P.R.China;2.Chongqing Engineering Research Center for Agricultural Non-Point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400716, P.R.China;3.Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, P.R.China
Abstract:
To investigate the effect of the food sources and trophic position of fish in different anthropogenic interference of Three Gorges Reservoir (TGR) and Changshou Reservoir, we used stable isotopes analysis to investigate the δ13C and δ15N signatures of fish in these two reservoirs. Meanwhile, differences in isotopic values and trophic position of fish were also compared. The result showed that little variation in δ13C values of fish was observed between TGR and Changshou Reservoir. The average δ13C values of fish observed in Changshou Reservoir (-22.66‰±1.94‰) was similar to that in TGR (-22.59‰±1.87‰). While, the δ15N values of fish in Changshou Reservoir (13.95‰ ±3.02‰) were significantly higher than that in TGR (11.98‰ ±2.25‰). We calculated the trophic level among different fishes based on the value of δ15N. The trophic level decreased in order of carnivorous fish > omnivorous fish > planktivore fish > herbivorous fish in TGR. While, a relative difference was occurred at Lake Changshou in terms of the trophic level which was conducted as planktivore fish > carnivorous fish > omnivorous fish > herbivorous fish when compared with those in TGR. The result indicated the uncertainty of trophic level derived from value of δ15N for aqueous systems with intensive influences of human activities.
Key words:  Carbon and nitrogen stable isotopes  trophic position  Three Gorges Reservoir  Changshou Reservoir  fish
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