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<p>The <i>Saccostrea mordax</i> Gould, 1850 is a typical intertidal species, whose genetic differentiation is influenced by various factors, including geological and climatic changes. To explore the genetic structure and historical population characteristics of <i>Saccostrea mordax</i>, we sequenced the mitochondrial cytochrome c oxidase subunit I (COI) gene from 58 specimens sampled from four locations in the western Pacific. Additionally, 103 individuals from the Persian Gulf and western Pacific (from databases) were included for phylogenetic analysis. The Bayesian Inference tree showed that all specimens were divided into two clades, i.e., the Persian Gulf population and the western Pacific population. Spatial molecular variance analysis indicated significant genetic differentiation between the two populations, and isolation by distance analysis revealed a positive correlation between genetic differentiation and geographic distance. Neutrality tests and Bayesian Skyline Plot suggested that both populations underwent expansions during the late Pleistocene. This study revealed the population history of <i>Saccostrea mordax</i> and described a new lineage, <i>Saccostrea mordax</i> lineage D, providing a foundation for understanding oyster biodiversity formation and genetic resource conservation.</p>

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Molecular phylogeography and population history of Saccostrea mordax based on mitochondrial DNA

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Zeyu Tang,
  • Cui Li,
  • Guochen Zang,
  • Zhenqiang Liu,
  • Zongmei Cui,
  • Haiyan Wang

摘要

The Saccostrea mordax Gould, 1850 is a typical intertidal species, whose genetic differentiation is influenced by various factors, including geological and climatic changes. To explore the genetic structure and historical population characteristics of Saccostrea mordax, we sequenced the mitochondrial cytochrome c oxidase subunit I (COI) gene from 58 specimens sampled from four locations in the western Pacific. Additionally, 103 individuals from the Persian Gulf and western Pacific (from databases) were included for phylogenetic analysis. The Bayesian Inference tree showed that all specimens were divided into two clades, i.e., the Persian Gulf population and the western Pacific population. Spatial molecular variance analysis indicated significant genetic differentiation between the two populations, and isolation by distance analysis revealed a positive correlation between genetic differentiation and geographic distance. Neutrality tests and Bayesian Skyline Plot suggested that both populations underwent expansions during the late Pleistocene. This study revealed the population history of Saccostrea mordax and described a new lineage, Saccostrea mordax lineage D, providing a foundation for understanding oyster biodiversity formation and genetic resource conservation.