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引用本文:王晓玲,徐东坡,刘凯,段金荣,施炜纲.太湖3个典型水域红鳍原鲌(Cultrichthys erythropterus13C和δ15N值的变化规律.湖泊科学,2015,27(5):925-931. DOI:10.18307/2015.0520
WANG Xiaoling,XU Dongpo,LIU Kai,DUAN Jinrong,SHI Weigang.The change of δ13C and δ15N values in Cultrichthys erythropterus from three typical areas within Lake Taihu. J. Lake Sci.2015,27(5):925-931. DOI:10.18307/2015.0520
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太湖3个典型水域红鳍原鲌(Cultrichthys erythropterus13C和δ15N值的变化规律
王晓玲1, 徐东坡2, 刘凯2, 段金荣2, 施炜纲1,2
1.南京农业大学无锡渔业学院, 无锡 214081;2.农业部长江下游渔业资源环境科学观测实验站, 中国水产科学研究院淡水渔业研究中心, 无锡 214081
摘要:
运用稳定性同位素分析技术研究红鳍原鲌δ13C和δ15N值变化规律,进一步探讨贡湖湾、鲤山湾和东太湖3个典型水域的红鳍原鲌食性差异.结果显示,红鳍原鲌的δ13C值与体长、δ15N值与体长呈显著正相关关系,大个体的红鳍原鲌(体长>138 mm)δ13C值和营养级显著高于小个体红鳍原鲌(体长<138 mm),表明红鳍原鲌在生长过程中随着口裂的增大和捕食能力的加强发生了食性转变现象:食物来源由小型浮游动物向鱼类转变.红鳍原鲌的δ13C在3个水域中具有明显的空间异质性,东太湖(-25.17‰±2.56‰)作为养殖活动影响区均显著低于贡湖湾(-23.11‰±1.05‰)和鲤山湾(-22.73‰±1.31‰),而且个体普遍偏小,说明红鳍原鲌种群分布可能存在一定的区域性,会根据栖息环境选择食物来源.红鳍原鲌在高浓度蓝藻的环境下,偏向摄食较大个体的动物性饵料,减轻对浮游动物的摄食压力,间接控制水体富营养化的发展.另外,还讨论了红鳍原鲌对生态系统的影响,为其资源保护和合理配置利用提供理论依据.
关键词:  太湖  红鳍原鲌  δ13C  δ15N  体长  营养级位置
DOI:10.18307/2015.0520
分类号:
基金项目:中央级公益性科研院所基本科研业务费专项资金项目(2013JBFT03)资助.
The change of δ13C and δ15N values in Cultrichthys erythropterus from three typical areas within Lake Taihu
WANG Xiaoling1, XU Dongpo2, LIU Kai2, DUAN Jinrong2, SHI Weigang1,2
1.Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, P. R. China;2.Scientific Observing and Experimental Station of Fishery Resources and Environment in the Lower Reaches of the Changjiang River, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Wuxi 214081, P. R. China
Abstract:
The aim of this study was to explore the feeding habits of Cultrichthys erythropterus by analyzing the changes and regularity of δ13C and δ15N in Gonghu Bay, Lishan Bay, and east Lake Taihu, using the stable isotope technology. The results showed that the values of δ13C and δ15N were positively correlated with the body length, and the δ13C and δ15N values. The trophic level in large C. erythropterus(>138 mm) individuals was significantly higher than that in the smaller ones (<138 mm), which indicated that C. erythropterus underwent size-related diet shift switching from small zooplankton to fish due to predation ability strengthening and mouth crack increasing. Obvious spatial heterogeneity could be observed in the δ13C and δ15N values of C. erythropterus in the three areas. C. erythropterus in east Lake Taihu(-25.17‰±2.56‰), affected by aquaculture, presented lower values of δ13C than those in Gonghu Bay(-23.11‰±1.05‰) and Lishan Bay(-22.73‰±1.31‰), and were generally smaller in body sizes, revealing that there were certain correlations between the population distributions and geographic locations. The C. erythropterus was fed on diets according to different habits, and preferred to large animal bait under the environment of high concentrations of blue-green algae in order to reduce the feeding pressure of zooplankton, and indirectly controlled the development of eutrophication. Furthermore, we also studied the influence of C. erythropterus on ecosystem. The results of this study can provide the theoretic basis for the protection and rational allocation of resources of the region.
Key words:  Lake Taihu  Cultrichthys erythropterus  δ13C  δ15N  body length  trophic level
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