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<p>The introduction of non-native species may result in hybridization events between closely related species. Hybridization may affect the genetic integrity of native species, with large effects on the conservation status of native populations. Here we investigated this issue in a sympatric population of the endangered white-clawed crayfish complex involving native <i>Austropotamobius pallipes</i> and a potential introduced population <i>Austropotamobius fulcisianus</i> respectively, through the analysis of microsatellite and COI mitochondrial DNA gene data. The two species showed clear genetic differentiation. We found higher genetic diversity in the sympatric population compared to pure populations of each species. Of the 60 specimens examined in the sympatric population, 55.6% displayed evidence of introgression (F2 and backcrosses), although no F1 hybrids were detected. A unidirectional backcross driven by <i>A. fulcisianus</i> was observed, leading to the replacement of <i>A. pallipes</i> in synoptic populations. These results have profound implications for species management of the endangered crayfish species complex, and practical conservation recommendations are discussed in the light of these findings.</p>

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Displacement of native Austropotamobius pallipes by Austropotamobius fulcisianus via hybridization and unidirectional introgression in the white-clawed species complex

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Frédéric Grandjean,
  • N. Gouin,
  • C. Delaunay,
  • T. Bergès,
  • M. Jelić,
  • P. Huchet,
  • A. Demene,
  • I. Paz-Vinas

摘要

The introduction of non-native species may result in hybridization events between closely related species. Hybridization may affect the genetic integrity of native species, with large effects on the conservation status of native populations. Here we investigated this issue in a sympatric population of the endangered white-clawed crayfish complex involving native Austropotamobius pallipes and a potential introduced population Austropotamobius fulcisianus respectively, through the analysis of microsatellite and COI mitochondrial DNA gene data. The two species showed clear genetic differentiation. We found higher genetic diversity in the sympatric population compared to pure populations of each species. Of the 60 specimens examined in the sympatric population, 55.6% displayed evidence of introgression (F2 and backcrosses), although no F1 hybrids were detected. A unidirectional backcross driven by A. fulcisianus was observed, leading to the replacement of A. pallipes in synoptic populations. These results have profound implications for species management of the endangered crayfish species complex, and practical conservation recommendations are discussed in the light of these findings.