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<p>The ricefish <i>Oryzias nigrimas</i> inhabits Lake Poso and the outflowing Poso River in Sulawesi, Indonesia. Although the lake and river populations could have diverged in parapatry, nothing is known about their genetic and morphological variation. Mitochondrial analysis showed that the lacustrine and riverine populations are closely related sisters and undelimitable. Nuclear analysis revealed differentiation of the two populations, in addition to known differences between species of <i>Oryzias</i> from Lake Poso. Body shape differed between the lake and stream populations, with the former being more streamlined and the latter being deeper bodied. These findings suggest that parapatric population divergence through ecological adaptation may have occurred in <i>O. nigrima</i>s in the Poso system.</p>

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Genetic and body-shape divergence of the ricefish Oryzias nigrimas between populations in Lake Poso and the outflowing Poso River, Sulawesi, Indonesia

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Ixchel F. Mandagi,
  • Akira W. R. Masengi,
  • Hirozumi Kobayashi,
  • Handung Nuryadi,
  • Kawilarang W. A. Masengi,
  • Kazunori Yamahira,
  • Ryo Kakioka

摘要

The ricefish Oryzias nigrimas inhabits Lake Poso and the outflowing Poso River in Sulawesi, Indonesia. Although the lake and river populations could have diverged in parapatry, nothing is known about their genetic and morphological variation. Mitochondrial analysis showed that the lacustrine and riverine populations are closely related sisters and undelimitable. Nuclear analysis revealed differentiation of the two populations, in addition to known differences between species of Oryzias from Lake Poso. Body shape differed between the lake and stream populations, with the former being more streamlined and the latter being deeper bodied. These findings suggest that parapatric population divergence through ecological adaptation may have occurred in O. nigrimas in the Poso system.