基于几何形态测量学的鄱阳湖北部水域刀鲚的耳石形态学特征比较  

Comparison of otolith geometric morphometrics for Coilia nasus from the northern Poyang Lake

作　　者：肖百义 姜涛[2] 刘洪波[2] 陈修报[2] 杨健[1,2] XIAO Baiyi;JIANG Tao;LIU Hongbo;CHEN Xiubao;YANG Jian(Wuxi Fisheries College,Nanjing Agricultural University,Wuxi 214081,China;Laboratory of Fishery Microchemistry,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences,Wuxi 214081,China)

机构地区：[1]南京农业大学无锡渔业学院,江苏无锡214081 [2]中国水产科学研究院淡水渔业研究中心,渔业微化学实验室,江苏无锡214081

出　　处：《水产学报》2025年第4期72-82,共11页Journal of Fisheries of China

基　　金：农业农村部财政专项(CJDC-2017-22)。

摘　　要：【目的】破解鄱阳湖北部不同水域刀鲚(含长颌鲚和短颌鲚两种生态表型)耳石间形态的差异性,以期把握这些水域刀鲚资源群体间的关联性。【方法】基于几何形态测量学的地标点法,利用地标点软件获取相应地标点坐标,进行相对扭曲主成分、判别和层次聚类分析;同时利用薄板样条分析对耳石形态进行网格变形,从而有效体现不同刀鲚群体间耳石形态的差异。【结果】在相对扭曲主成分分析中,主凹槽上地标点的相对扭曲贡献率为78%。相对扭曲得分的逐步判别分析发现,上述两种生态表型刀鲚的耳石形态学差异极其显著,二者间相对扭曲得分判别成功率高达100%。此外,长颌鲚不同群体间廖咀头群体的判别准确率最高(95%),其次是庐山火焰山群体(90%)、瓢头群体(55%)、鞋山群体(50%);长颌鲚聚类分析表明火焰山、鞋山和瓢头群体距离最近,其次为廖咀头群体,与火焰山短颌鲚群体距离最远。【结论】本研究证实湖口鞋山、庐山廖咀头、永修瓢头水域均有长颌鲚的分布,且不同水域群体耳石形态间的差异主要集中在主凹槽处。三个水域群体中廖咀头长颌鲚可能是一个相对独立的群体,而其他水域该生态表型群体间却存在一些关联性。本研究通过分析不同水域刀鲚耳石形态间的差异性,阐释了鄱阳湖北部水域刀鲚的群体组成特征,可为相关渔业管理和保护提供科学依据和理论支撑。Coilia nasus belongs to Clupeiformes,Engraulidae,Coilia,which is a commercially valuable fish in China.Otoliths(sagittae,asteriscus,or lapillus)are complex tissue structures with calcium carbonate(CaCO3)as the main component,and their shapes vary markedly depending on the species and population.Because sagittae(saccular otoliths)are the largest and present the most significant interspecific variation among the three pairs of otoliths,thus they are the most used in research.To compare with traditional morphological surveying methods,geometric morphometric methods transform qualitative analysis into quantitative analysis.Especially,landmark-based geometric morphometric analysis is attracting more and more attention in recent years and has been applied to a variety of fields of fish otolith investigation.In order to understand the variation in the otolith shape of C.nasus(including the long supermaxilla and short supermaxilla C.nasus ecomorphotypes,the latter was once named C.brachygnathus)populations from different sites(i.e.,Xieshan site of Hukou County,Liaozuitou site and Huoyanshan site of Lushan City,Piaotou site of Yongxiu County)in northern area of the Poyang Lake and reveal their population connectivity,landmark-based geometric morphometric analysis was used in the present study.The otolith morphometric characteristics were documented with relative warp principal components analysis,discriminate analysis,cluster analysis,and further visualizing grid deformation by thin plate spline.The results showed that landmarks in the sulcus had the main contribution(77.9%)in explaining the primary source of otolith morphometric variation.Discriminate analysis of relative warps obtained 100%classification success for the variation between long supermaxilla and short supermaxilla C.nasus for the first time,demonstrating the tremendous difference in geometric morphometrics between the two ecomorphotypes.Viewing from long supermaxilla C.nasus,discriminate analysis showed that the highest identifying accuracy(95%)was found f

关 键 词：刀鲚 耳石 关联性 地标点 几何形态测量学 鄱阳湖 

分 类 号：S932.4[农业科学—渔业资源]