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Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran)

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Abstract

It has been postulated that the building of the Shahid-Rajaei dam on the Tajan River around 1995 has lead to the morphological divergence of Siah Mahi Capotes capoeta gracilis (Pisces) of up- and downstream populations due to the isolation. A 13-landmark morphometric truss network system was used to investigate the hypothesis. Univariate analysis of variance showed significant differences between the means of the two groups for 45 standardized morphometric measurements out of 78 characters studied. In linear discriminant function analysis (DFA), the overall assignment of individuals into their original groups was 87.6%. The proportion of individuals correctly classified into their original groups was 90.3% for upstream and 83.7% for downstream population. The principal component analysis (PCA) scatter plot of individual component scores between PC1 and PC2 showed 121 fish specimens grouped into two areas but with a relativity high degree of overlap between two populations. Clustering analysis based on Euclidean square distances among groups of centroids using an UPGMA resulted into two main clusters indicating two populations of C. c. gracilis. The present study indicated the presence of two morphologically different populations of C. c. gracilis in the Tajan River across the Shahid-Rajaei dam, probably due to their limited downstream dispersal and the elimination of upstream migration altogether, due the construction of the dam.

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Acknowledgments

We express our sincere thanks to Kia Amani, Majid Kargar and Sajad Pishnamaz-zade for their help in specimen collection, and thank Roghaieh Gholampor and Atena Porsohrab for helping us in fixing and taking the photographs of the fishes. We also thank Habib-Alla AnvariFar for the financial support. Special thanks to Sajad Rashidi-Monfared and Ahmad Nori for editing the manuscript. We dedicate this article to Don McAllister for his outstanding research about effects of dams on fishes.

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Authors and Affiliations

  1. Department of Fisheries, University of Applied Science and Technology, P.O. Box 4916694338, Golestan, Iran

    Hossein AnvariFar

  2. University of Applied Science and Technology, Tehran, Iran

    Alireza Khyabani

  3. Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

    Hamid Farahmand

  4. Department of Fisheries, Faculty of Natural Resources and Agriculture, Islamic Azad University of Babol, Mazandaran, Iran

    Saber Vatandoust

  5. Department of Veterinary, Faculty of Veterinary, Islamic Azad University of Babol, Mazandaran, Iran

    Hassan AnvariFar

  6. Fish Genetics and Biotechnology Division, Central Institute of Fisheries Education, Fisheries University Road, Versova, Mumbai, 400 061, India

    Shrinivas Jahageerdar

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  1. Hossein AnvariFar
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Correspondence to Hossein AnvariFar.

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Handling editor: M. Power

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AnvariFar, H., Khyabani, A., Farahmand, H. et al. Detection of morphometric differentiation between isolated up- and downstream populations of Siah Mahi (Capoeta capoeta gracilis) (Pisces: Cyprinidae) in the Tajan River (Iran). Hydrobiologia 673, 41–52 (2011). https://doi.org/10.1007/s10750-011-0748-7

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