Mitochondrial marker–based analyses provide new insights into role of coral reef ecosystems in molluscan speciation

Ameri, Shijin and Laxmilatha, P and Labeeb, K A and Ranjith, L and Kathirvelpandian, A (2021) Mitochondrial marker–based analyses provide new insights into role of coral reef ecosystems in molluscan speciation. Organisms Diversity & Evolution. pp. 1-10.

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Abstract

The high species diversity in tropical coral ecosystem indicates that it is driven by diferent set of mechanisms which are beyond conventional allopatric ecological speciation models, because geographical barriers are limited in marine ecosystems. Specifc diferences were observed in shell coloration of Conus catus (Hwass in Histoire naturelle des vers. volume 1. Pancoucke, Paris, 1792), specimens collected from adjacent ecologically diferent habitats. Maximum likelihood clustering approaches were done based on mitochondrial genes, Cytochrome oxidase I (COI) and 16S ribosomal RNA (16S rRNA) genes. Multiple molecular marker–based analyses revealed that coral reef ecological niche–dependent adaptive divergent evolutionary selective pressure is acting on both coding and non-coding mitochondrial markers. Adjacent ecologically different habitats like rocky shore and subtidal coral reef fats in Lakshadweep Islands have less genetic connectivity compared with geographically separated similar ecosystems like rocky shores in Arabian sea, Bay of Bengal, and Pacifc Ocean. These haplotype variations are giving new insights into the evolutionary genetic process hidden in ecological speciation of molluscs. We also observed that Conus striolatus (Kiener in Icon. des Coq. Viv., 2, 1845), a morphologically similar species to rocky shore C. catus, is the outcome of sympatric speciation through the modifed niche-dependent selection pressure exerting on each other in rocky intertidal ecosystems. The present study revealed that ecotypes of C. catus are in the way of parapatric speciation and remind that basic unit of biodiversity conservation should be the habitat apart from the species.

Item Type:	Article
Uncontrolled Keywords:	Parapatric speciation; Conidae; Genetic variation; Cytochrome oxidase I; 16S ribosomal RNA
Subjects:	Marine Ecosystems > Coral Reefs Molluscan Fisheries
Divisions:	CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division
Depositing User:	Arun Surendran
Date Deposited:	15 Jan 2022 12:14
Last Modified:	15 Jan 2022 12:14
URI:	http://eprints.cmfri.org.in/id/eprint/15688

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