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RESEARCH ARTICLE

Mitochondrial genetic divergence of Chiton articulatus (Polyplacophora: Chitonida) in the Mexican Tropical Pacific

Thelma A. Aguilar-Rendon A B # , Omar Hernando Avila-Poveda https://orcid.org/0000-0002-4411-0602 A B C # and Nancy C. Saavedra-Sotelo https://orcid.org/0000-0001-9277-0675 A C *
+ Author Affiliations
- Author Affiliations

A Facultad de Ciencias del Mar (FACIMAR), Universidad Autónoma de Sinaloa (UAS), Mazatlán, Sinaloa, Mexico.

B Proyecto Quitón del Pacífico Tropical Mexicano, Mazatlán, Sinaloa, Mexico.

C Programa de Investigadoras e Investigadores por México, Secretaría de Ciencia, Humanidades Tecnología e Innovación (SECIHTI), Ciudad de México, Mexico.

* Correspondence to: nsaavedra@uas.edu.mx

# These authors contributed equally to this paper

Handling Editor: Max Finlayson

Marine and Freshwater Research 76, MF24172 https://doi.org/10.1071/MF24172
Submitted: 1 August 2024  Accepted: 22 March 2025  Published: 14 April 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Chiton articulatus is a gonochoric, free-spawning mollusc with short-lived trochophore larvae inhabiting rocky shores along the fragmented and heterogeneous Mexican Tropical Pacific (MTP). Its limited dispersal in this patchy environment may lead to genetic divergence among populations.

Aims

Our objective was to characterise the genetic diversity and population structure of C. articulatus based on mitochondrial DNA.

Methods

We conducted a phylogeographic analysis using the cytochrome c oxidase subunit I (COI) gene of mitochondrial DNA collected from 100 C. articulatus organisms located across its geographic distribution.

Key results

The findings showed high levels of genetic diversity and a high number of private haplotypes. The structure analysis indicated six genetically distinct clusters with low connectivity. Divergence between the northern and southern populations was evident, with central mixing suggesting that gene flow adhered to the stepping-stone model. The historical demography indicated that the populations experienced sudden expansions during the late Pleistocene and early Holocene.

Conclusions

The northernmost and southernmost C. articulatus populations exhibit significant genetic divergence, suggesting the presence of distinct stocks in the MTP. Nevertheless, we recommend prioritising the conservation of central populations, as they serve as essential genetic reservoirs for all populations.

Implications

Our findings contribute to the broader understanding of how limited larval dispersal and habitat fragmentation shape population structure in marine invertebrates. The identification of distinct genetic stocks and central populations acting as genetic reservoirs underscores the importance of integrating genetic data into marine spatial planning and fisheries management. This research provides a framework for the conservation of other intertidal species with similar life histories in fragmented coastal environments.

Keywords: ecoregion Mexican Tropical Pacific, fishery, genetic drift, heteroplasmy, isolation-by-distance, marine invertebrates, mtDNA, rocky intertidal.

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