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<p>The isolated population of the leaf beetle <i>Cheilotoma musciformis</i> occupies a limited number of sites in Poland, where the species is considered endangered and an indicator of well-preserved xerothermic grasslands. Its host plants belong to the family Fabaceae, particularly sainfoins such as <i>Onobrychis arenaria</i> and <i>Onobrychis viciifolia</i>. To test whether the beetle’s distribution is linked to host plant genetics, sainfoin populations collected from locations with and without the presence of <i>C. musciformis</i> were analysed using two dominant marker systems, ISSR and SRAP. Both markers revealed high levels of polymorphism and a moderate correlation between distance matrices, indicating complementary but non-redundant signals of genetic variation. At the group level (presence vs. absence of <i>C. musciformis</i>), populations exhibited nearly identical genetic diversity, with a very low number of unique bands. A hierarchical three-level AMOVA showed that most genetic variation was distributed within populations (72.36%), followed by variation among populations within groups (22.04%), whereas variation among groups was low but still significant (5.60%). Similarly, overall genetic differentiation between populations was higher (29% of the variance), and genetic distances were significantly correlated with geographic distances (R = 0.64, <i>p</i> = 0.001). These findings do not support a strong association between the current distribution of the beetle and genetic differentiation in its host plant, suggesting that other factors, including habitat quality and continuity, are likely more important.</p>

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Patterns of genetic variation in Onobrychis viciifolia populations across xerothermic grasslands and the distribution of Cheilotoma musciformis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月7日

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  • Sylwia Sowa,
  • Edyta Paczos-Grzęda,
  • Joanna Lech,
  • Aneta Koroluk,
  • Mariusz Kulik,
  • Małgorzata Jaźwa,
  • Łukasz Kajtoch,
  • Miłosz A. Mazur,
  • Radosław Ścibior,
  • Justyna Wielgos

摘要

The isolated population of the leaf beetle Cheilotoma musciformis occupies a limited number of sites in Poland, where the species is considered endangered and an indicator of well-preserved xerothermic grasslands. Its host plants belong to the family Fabaceae, particularly sainfoins such as Onobrychis arenaria and Onobrychis viciifolia. To test whether the beetle’s distribution is linked to host plant genetics, sainfoin populations collected from locations with and without the presence of C. musciformis were analysed using two dominant marker systems, ISSR and SRAP. Both markers revealed high levels of polymorphism and a moderate correlation between distance matrices, indicating complementary but non-redundant signals of genetic variation. At the group level (presence vs. absence of C. musciformis), populations exhibited nearly identical genetic diversity, with a very low number of unique bands. A hierarchical three-level AMOVA showed that most genetic variation was distributed within populations (72.36%), followed by variation among populations within groups (22.04%), whereas variation among groups was low but still significant (5.60%). Similarly, overall genetic differentiation between populations was higher (29% of the variance), and genetic distances were significantly correlated with geographic distances (R = 0.64, p = 0.001). These findings do not support a strong association between the current distribution of the beetle and genetic differentiation in its host plant, suggesting that other factors, including habitat quality and continuity, are likely more important.