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<p>The black bean aphid, <i>Aphis fabae</i> Scopoli, 1763 is one of the most extensively studied aphid species worldwide. It is a highly polyphagous pest with a nearly global distribution, infesting a wide range of economically important crops. The species comprises closely related, host-associated subspecies with subtle or indistinguishable morphological differences and is therefore often referred to as the <i>A. fabae</i> complex. In this study, we applied an integrative approach to evaluate genetic and morphological variation within the complex by combining molecular analyses of COI sequences and geometric morphometric analyses of fore wings. Molecular results revealed eleven haplotypes, with most specimens grouped into one haplotype, indicating low genetic divergence and absence of clear structuring by host plant or geography. In contrast, geometric morphometric analysis of fore wings revealed a certain level of host-associated wing shape differentiation. These findings highlight the limited resolution of COI for subspecies delineation within <i>A. fabae</i> complex while demonstrating the potential of wing morphometrics to detect subtle but consistent signals of morphological differences.</p>

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Integrative insights into the Aphis fabae Scopoli, 1763 complex: genetic and morphometric variability

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Darija Milenković,
  • Maja Lazarević,
  • Vladimir Žikić,
  • Saša S. Stanković,
  • Jovanka Vladejić,
  • Olivera Petrović-Obradović,
  • Marijana Ilić Milošević

摘要

The black bean aphid, Aphis fabae Scopoli, 1763 is one of the most extensively studied aphid species worldwide. It is a highly polyphagous pest with a nearly global distribution, infesting a wide range of economically important crops. The species comprises closely related, host-associated subspecies with subtle or indistinguishable morphological differences and is therefore often referred to as the A. fabae complex. In this study, we applied an integrative approach to evaluate genetic and morphological variation within the complex by combining molecular analyses of COI sequences and geometric morphometric analyses of fore wings. Molecular results revealed eleven haplotypes, with most specimens grouped into one haplotype, indicating low genetic divergence and absence of clear structuring by host plant or geography. In contrast, geometric morphometric analysis of fore wings revealed a certain level of host-associated wing shape differentiation. These findings highlight the limited resolution of COI for subspecies delineation within A. fabae complex while demonstrating the potential of wing morphometrics to detect subtle but consistent signals of morphological differences.