Trends in morphological relationships among Gangetic Cyprinids

Cyprinidae is the predominant and most diverse taxonomic group of freshwater fishes, exhibiting enormous diversity in shape, size and biology. The morphological diversity of Indian Cyprinids especially the Gangetic Cyprinids is largely unquantified. Geometric morphometrics (GM) approach is an efficient tool to quantify overall body shape variations and has wide application in taxonomic, evolutionary and ecological studies. In this study, digital photographs of 47 Cyprinid fish species from Ganga River were used to measure geometric body shape so as to evaluate interspecific morphometric relationships. Combined results of principal component analysis (PCA), canonical variate analysis (CVA) and Cluster analysis (CA) revealed interspecific differences in Cyprinid fishes. Phenogram showed that all the species of different genus like Barilius, Garra, Labeo, Pethia, Schizothorax and Tor are clustered together in their respective group. This indicates that species of respective genus share com...

鲤科（Cyprinidae）是淡水鱼类中占主导地位且多样性最为丰富的类群，在体型、大小及生物学特性上展现出极高的多样性。印度鲤科鱼类，尤其是恒河（Ganga River）流域的鲤科鱼类，其形态多样性在很大程度上仍未得到量化。几何形态测量学（Geometric morphometrics, GM）是一种高效量化整体体型变异的工具，在分类学、进化与生态学研究中应用广泛。本研究采用恒河流域47种鲤科鱼类的数码照片，测量其几何形态体型特征，以评估种间形态计量关系。主成分分析（Principal Component Analysis, PCA）、典范变量分析（Canonical Variate Analysis, CVA）与聚类分析（Cluster Analysis, CA）的联合分析结果揭示了鲤科鱼类的种间形态差异。树状聚类图（Phenogram）显示，Barilius、Garra、Labeo、Pethia、Schizothorax及Tor等不同属的物种均各自聚为对应类群。这表明各属的物种共享共通的