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<p>The mottled spinefoot <i>Siganus fuscescens</i> is a widespread siganid of the western Indo-Pacific. <i>S. fuscescens</i> plays an important role as a keystone species in maintaining the health of the coral reef ecosystem and is of commercial significance for fisheries. Understanding its population genetics is fundamental for management and sustainable exploitation. However, such knowledge on <i>S. fuscescens</i> in Vietnam is lacking. The present study investigated the genetic diversity and population structure of <i>S. fuscescens</i> in this country. In total, 152 samples were collected from six populations. An analysis of the mitochondrial control region revealed 35 unique haplotypes, with the highest number identified in Cua Gianh, Son Cha, and Ly Son. The phylogenetic tree and haplotype network indicated two Vietnamese lineages of <i>S. fuscescens</i>. Genetic diversity indices were high for haplotypes (0.706–0.870) and low for nucleotides (0.004–0.09). The pairwise <i>F</i><sub>ST</sub> values between Phu Quoc in western waters and five locations in eastern waters were greater than those between locations within this group of populations. However, analysis of molecular variance (AMOVA) between the western (Phu Quoc) and eastern groups (five remaining populations) did not reveal any significant variation in population structure (<i>F</i><sub>CT</sub> = 0.1339, <i>P = 0.158</i> for&#xa0;all individuals; <i>F</i><sub>CT</sub> = 0.2531, <i>P</i> = <i>0.1693</i> for Clade A). This study makes a prominent contribution to understanding the genetic diversity of <i>S. fuscescens</i> in the Indo-West Pacific.</p>

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Genetic diversity and population structure of the mottled spinefoot Siganus fuscescens in Vietnam

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Thinh Dinh Do,
  • The Duc Nguyen,
  • Chien Van Pham,
  • Ha Thi Dinh,
  • Thanh Quyet Vu,
  • Li Lian Wong,
  • Quan Van Nguyen

摘要

The mottled spinefoot Siganus fuscescens is a widespread siganid of the western Indo-Pacific. S. fuscescens plays an important role as a keystone species in maintaining the health of the coral reef ecosystem and is of commercial significance for fisheries. Understanding its population genetics is fundamental for management and sustainable exploitation. However, such knowledge on S. fuscescens in Vietnam is lacking. The present study investigated the genetic diversity and population structure of S. fuscescens in this country. In total, 152 samples were collected from six populations. An analysis of the mitochondrial control region revealed 35 unique haplotypes, with the highest number identified in Cua Gianh, Son Cha, and Ly Son. The phylogenetic tree and haplotype network indicated two Vietnamese lineages of S. fuscescens. Genetic diversity indices were high for haplotypes (0.706–0.870) and low for nucleotides (0.004–0.09). The pairwise FST values between Phu Quoc in western waters and five locations in eastern waters were greater than those between locations within this group of populations. However, analysis of molecular variance (AMOVA) between the western (Phu Quoc) and eastern groups (five remaining populations) did not reveal any significant variation in population structure (FCT = 0.1339, P = 0.158 for all individuals; FCT = 0.2531, P = 0.1693 for Clade A). This study makes a prominent contribution to understanding the genetic diversity of S. fuscescens in the Indo-West Pacific.