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<p>Most vertebrates are incapable of independently digesting complex polysaccharides found in plant materials. However, symbiotic gut microbiota can play a crucial role in extracting nutrients from recalcitrant substrates, enabling herbivores to thrive. This study explores the hindgut bacterial composition of <i>Siganus fuscescens</i> a herbivorous fish, to elucidate microbial contributions to its nutrient acquisition and adaptation to different environments. Gut samples were collected from wild <i>S. fuscescens</i> populations in Shizugawa, Jogashima, and Wakayama, Japan, as well as from domesticated individuals in Wakayama, and analyzed using 16S rRNA gene sequencing. The analysis revealed a distinct enrichment of Firmicutes, Bacteroidota, Verrucomicrobiota, and Desulfobacterota within the gut microbiota, including specific indicator taxa such as <i>Tannockella kyphosi</i> and <i>Chakrabartyella piscis</i>, which are complex algal polysaccharides degraders. Geographic origin had a significant impact on microbial composition, with marked differences observed between wild and domesticated fish. The persistence of a core gut microbiome across varying diet treatments underscores its crucial role in supporting the adaptive capacity of <i>S. fuscescens</i> to diverse habitats and lifestyles. Functional predictions inferred form 16S rRNA data revealed broader enrichment in core carbon metabolism, antibiotic biosynthesis pathways in wild fish microbiota, pointing to adaptation to more diverse metabolic capabilities and competition.</p>

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Exploring the gut microbiota of Siganus fuscescens with inferred functional roles in nutrient utilization

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Samuel Mwakisha Mwamburi,
  • John Paul Matthew D. Guzman,
  • Kayo Konishi,
  • Reiko Nozaki,
  • Nobuhiro Hattori,
  • Keiichiro Koiwai,
  • Ikuo Hirono,
  • Hidehiro Kondo

摘要

Most vertebrates are incapable of independently digesting complex polysaccharides found in plant materials. However, symbiotic gut microbiota can play a crucial role in extracting nutrients from recalcitrant substrates, enabling herbivores to thrive. This study explores the hindgut bacterial composition of Siganus fuscescens a herbivorous fish, to elucidate microbial contributions to its nutrient acquisition and adaptation to different environments. Gut samples were collected from wild S. fuscescens populations in Shizugawa, Jogashima, and Wakayama, Japan, as well as from domesticated individuals in Wakayama, and analyzed using 16S rRNA gene sequencing. The analysis revealed a distinct enrichment of Firmicutes, Bacteroidota, Verrucomicrobiota, and Desulfobacterota within the gut microbiota, including specific indicator taxa such as Tannockella kyphosi and Chakrabartyella piscis, which are complex algal polysaccharides degraders. Geographic origin had a significant impact on microbial composition, with marked differences observed between wild and domesticated fish. The persistence of a core gut microbiome across varying diet treatments underscores its crucial role in supporting the adaptive capacity of S. fuscescens to diverse habitats and lifestyles. Functional predictions inferred form 16S rRNA data revealed broader enrichment in core carbon metabolism, antibiotic biosynthesis pathways in wild fish microbiota, pointing to adaptation to more diverse metabolic capabilities and competition.