A preliminary investigation on the population genetic structure of Etroplus canarensis day 1877 of the Western Ghats India

Antony Mano Mohan, . and Sreedharan Sandeep, . and Joseph Joelin, . and Anoop V.S., . and George Sanil, . A preliminary investigation on the population genetic structure of Etroplus canarensis day 1877 of the Western Ghats India. pp. 190-195. ISSN 0116-6514

The Canara pearl spot Etroplus canarensis Day 1877 is an endangered and endemic freshwater fish with a restricted distribution in the Western Ghats of India. In spite of the importance as an ornamental fish no genetic and conservation studies are available for the species. In this work mitochondrial 16S ribosomal gene sequences were used to infer the population genetic structure of three geographical populations. It is deduced from the study that all three populations in the study can be considered as a single population with a bottleneck or founder effect. Low haplotype and nucleotide diversity were observed among populations. These were supported by AMOVA analysis that showed the total variations are within the populations. Furthermore data on the pairwise genetic distance (FST) and the rate of migration among populations (Nm) showed very weak genetic differentiation with low gene flow between populations. The phylogenetic tree with clustering of all haplotypes from three populations further supports the upshot of a single population. Meanwhile the neutrality test results (Tajimas D Fus Fs D and F) provided evidence for the population bottleneck. Haplotype network analysis revealed a recent population expansion and the presence of a founder haplotype. Consolidated results of haplotype network and neutrality tests propose the scenario of recovery of the population from earlier bottleneck succeeded by very recent population expansion. The results provided in the study may serve as baseline data for future investigations.

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Abstract

The Canara pearl spot Etroplus canarensis Day 1877 is an endangered and endemic freshwater fish with a restricted distribution in the Western Ghats of India. In spite of the importance as an ornamental fish no genetic and conservation studies are available for the species. In this work mitochondrial 16S ribosomal gene sequences were used to infer the population genetic structure of three geographical populations. It is deduced from the study that all three populations in the study can be considered as a single population with a bottleneck or founder effect. Low haplotype and nucleotide diversity were observed among populations. These were supported by AMOVA analysis that showed the total variations are within the populations. Furthermore data on the pairwise genetic distance (FST) and the rate of migration among populations (Nm) showed very weak genetic differentiation with low gene flow between populations. The phylogenetic tree with clustering of all haplotypes from three populations further supports the upshot of a single population. Meanwhile the neutrality test results (Tajimas D Fus Fs D and F) provided evidence for the population bottleneck. Haplotype network analysis revealed a recent population expansion and the presence of a founder haplotype. Consolidated results of haplotype network and neutrality tests propose the scenario of recovery of the population from earlier bottleneck succeeded by very recent population expansion. The results provided in the study may serve as baseline data for future investigations.

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Item Type:	Article
AGROVOC Term:	Cichlidae
AGROVOC Term:	Freshwater fishes
AGROVOC Term:	Endemic species
AGROVOC Term:	Endangered species
AGROVOC Term:	Genetic distance
AGROVOC Term:	Population genetics
AGROVOC Term:	Population distribution
AGROVOC Term:	Geographical distribution
AGROVOC Term:	Nucleotides
AGROVOC Term:	Polymorphism
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8746

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