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Morphometric variation studies on Cypriniformes fish of Devario aequipinnatus from selected rivers/streams of the Southern Western Ghats, Tamil Nadu, India

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Author Affiliations

  • 1Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, 627 412 Tamil Nadu, INDIA

Int. Res. J. Environment Sci., Volume 4, Issue (10), Pages 77-86, October,22 (2015)

Abstract

The morphometric variations were investigated on cypriniformes fish of Devario aequipinnatus from selected rivers of the Southern Western Ghats, Tamil Nadu. It was evaluated and compared with individual species and compared same in each study area. The samples were collected on both the rainy and summer from five sites as the selected rivers of Kalakkad Mudanthurai Tiger Reserve (KMTR) region (Kallar, Karaiyar, Manimuthar, Ramanathi) and other one at Kalikesam, Kanyakumari district). Their collected fish samples of morphometric characters are differentiated by various standard analyses of difference were carried out to examine the implication of morphometric variations among populations. The species wise and population wise descriptive statistics viz., minimum, maximum, mean, standard deviation; the coefficient of variation (CV) of all morphometric traits, the multivariate coefficient of variation (CVp) and the Principle Component Analysis were carried out. The detected phenotypical divergence between Devario aequipinnatus specimens revealed the fact of existing of five morphologically separated stocks within the samples may imply as a possibility a relationship among the extent of phenotypic heterogeneity and the geographic distance, shows limited combine into one among the populations. From this five populations of D. aequipinnatus were distinct with each other, their completely variation between the Karaiyar and Manimuthar river while compared with other three populations were distinct. This study suggests that the presence of morphometric variations among the evaluated site within same species.

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