Evidence of shape variation in wild Tor Mahseer (Tor tor) from Indian Rivers

It has been hypothesized that geographical isolation between river ecosystems often resulted in phenotypic variation and ultimately change in the population structure of aquatic species. To test the hypothesis, 471 individuals of Tor Mahseer, Tor tor, were collected across its distribution range fro...

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Published in:River research and applications 2021-12, Vol.37 (10), p.1424-1436
Main Author: Dwivedi, Arvind Kumar
Format: Article
Language:English
Subjects:
Aquatic ecosystems
Aquatic populations
Basins
Environmental management
Geographical isolation
Morphometry
Multivariate analysis
Phenotypic variation
Phenotypic variations
population
Population structure
Populations
River basins
River ecology
Rivers
Shape
Stocks
Tor Mahseer
Tor tor
Variance analysis
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description It has been hypothesized that geographical isolation between river ecosystems often resulted in phenotypic variation and ultimately change in the population structure of aquatic species. To test the hypothesis, 471 individuals of Tor Mahseer, Tor tor, were collected across its distribution range from 18 locations on 10 Indian Rivers covering the Ganges, Narmada, and Godavari River basins to assess the population‐level inter‐ and intra‐basin shape variation through landmark‐based “geometric morphometrics.” Overall, multivariate analysis of variance (MANOVA) showed significant differences (F = 3.33, p 
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To test the hypothesis, 471 individuals of Tor Mahseer, Tor tor, were collected across its distribution range from 18 locations on 10 Indian Rivers covering the Ganges, Narmada, and Godavari River basins to assess the population‐level inter‐ and intra‐basin shape variation through landmark‐based “geometric morphometrics.” Overall, multivariate analysis of variance (MANOVA) showed significant differences (F = 3.33, p &lt; .001) in shape across wild populations. The Mahalanobis and Procrustes distances extracted from canonical variate analysis (CVA) were found to be significant (p &lt; .001) between basins and nonsignificant (p &gt; .001) within basin except Banas and Kali Sindh Rivers in the Ganges River basin. The results indicated that Tor Mahseer in Indian Rivers were represented by four heterogeneous phenotypic stocks (1: the Ganges River basin except Banas and Kali Sindh River; 2: the Banas and Kali Sindh River; 3: the Narmada River basin, and 4: the Godavari River basin) based on their shape. The wireframes depicted variation mainly in the head region, body depth, and the caudal peduncle area between four phenotypic stocks. The population‐level shape variation between the basins might be due to geographical isolation between the basins and within the Ganges basin because of river fragmentation due to habitat alteration, which restricts the movement of fishes. 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subjects Aquatic ecosystems
Aquatic populations
Basins
Environmental management
Geographical isolation
Morphometry
Multivariate analysis
Phenotypic variation
Phenotypic variations
population
Population structure
Populations
River basins
River ecology
Rivers
Shape
Stocks
Tor Mahseer
Tor tor
Variance analysis
title Evidence of shape variation in wild Tor Mahseer (Tor tor) from Indian Rivers
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