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<p>The endangered allotetraploid spined loach, <i>Cobitis takenoi</i>, is restricted to a limited area of a single River in Kyoto Prefecture, Japan. Although it coexists with another tetraploid congener, <i>Cobitis</i> sp. BIWAE type A sensu Nakajima et al. (Nakajima et al., Jpn J Ichthyol 59:86–95, 2012), no hybrid individuals have been reported. Principal component analysis of meristic and morphometric characters identified a single mature male specimen, collected from the field, with intermediate morphological characteristics, suggesting its hybrid status. Mitochondrial and nuclear DNA analyses confirmed that this specimen had <i>C. takenoi</i> as the maternal parent and <i>C.</i> sp. BIWAE type A as the paternal parent. This report is the first record of a natural cross-tetraploid hybridization in fish and highlights the potential risks of genetic disturbance and reproductive interference, emphasizing the need for careful management to mitigate these threats for the <i>in situ</i> conservation of <i>C. takenoi</i>.</p>

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First record of natural hybridization of endangered allotetraploid spined loach Cobitis takenoi with tetraploid congener species

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Yuki Yashima,
  • Takeru Uechi,
  • Mai Hirao,
  • Tadao Kitagawa

摘要

The endangered allotetraploid spined loach, Cobitis takenoi, is restricted to a limited area of a single River in Kyoto Prefecture, Japan. Although it coexists with another tetraploid congener, Cobitis sp. BIWAE type A sensu Nakajima et al. (Nakajima et al., Jpn J Ichthyol 59:86–95, 2012), no hybrid individuals have been reported. Principal component analysis of meristic and morphometric characters identified a single mature male specimen, collected from the field, with intermediate morphological characteristics, suggesting its hybrid status. Mitochondrial and nuclear DNA analyses confirmed that this specimen had C. takenoi as the maternal parent and C. sp. BIWAE type A as the paternal parent. This report is the first record of a natural cross-tetraploid hybridization in fish and highlights the potential risks of genetic disturbance and reproductive interference, emphasizing the need for careful management to mitigate these threats for the in situ conservation of C. takenoi.