, Volume 673, Issue 1, pp 41–52 | Cite as

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

  • Hossein AnvariFarEmail author
  • Alireza Khyabani
  • Hamid Farahmand
  • Saber Vatandoust
  • Hassan AnvariFar
  • Shrinivas Jahageerdar
Primary Research Paper


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.


Siah Mahi Dam Morphometric differentiation Truss network system Tajan River 



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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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Hossein AnvariFar
    • 1
    Email author
  • Alireza Khyabani
    • 2
  • Hamid Farahmand
    • 3
  • Saber Vatandoust
    • 4
  • Hassan AnvariFar
    • 5
  • Shrinivas Jahageerdar
    • 6
  1. 1.Department of FisheriesUniversity of Applied Science and TechnologyGolestanIran
  2. 2.University of Applied Science and TechnologyTehranIran
  3. 3.Department of Fisheries, Faculty of Natural ResourcesUniversity of TehranKarajIran
  4. 4.Department of Fisheries, Faculty of Natural Resources and AgricultureIslamic Azad University of BabolMazandaranIran
  5. 5.Department of Veterinary, Faculty of VeterinaryIslamic Azad University of BabolMazandaranIran
  6. 6.Fish Genetics and Biotechnology DivisionCentral Institute of Fisheries EducationVersova, MumbaiIndia

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