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<p>In studies of biological invasions, genomic data reveal introduction events, population structure and spatial expansion pathways, providing key insights to inform targeted and effective invasive species management. However, fine-scale genetic studies elucidating the invasion processes remain scarce. This study investigates the local invasion dynamics of the avian-dispersed shrub <i>Pyracantha angustifolia</i> in a mountain basin of the Chaco Serrano, Córdoba, Argentina, integrating spatial distribution surveys with high-throughput RAD-sequencing genomic data. Sampling across an elevation gradient along a stream revealed species density decline with increasing elevation and distance from water, indicating recruitment hotspots near streams. Genetic analyses uncovered two distinct clusters with a patchy distribution, moderate differentiation and differing genetic diversity, suggesting at least two, genetically diverse, independent introductions. Kinship analyses, which compare shared genetic variants to identify familial ties, revealed pervasive familial relationships within clusters but none between them, indicating fine-scale kin structure driven by localized dispersal and lack of post-introduction interbreeding between groups. Partial Mantel tests indicated a weak isolation-by-distance pattern at the landscape scale, while dispersal kernel modeling, which estimates probability distributions of dispersal distances, supported predominance of short-distance dispersal and occasional longer dispersal events (up to the maximum sampled of approx. 6&#xa0;km). The findings provide practical data to improve ongoing management and control strategies to preserve the invaded ecosystem.</p>

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Fine-scale genetic analyses reveal invasion dynamics and management opportunities in a mountain basin for an avian-dispersed shrub

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Lisandro Fernández,
  • David L. Vergara-Tabares,
  • Carolina Carrizo García

摘要

In studies of biological invasions, genomic data reveal introduction events, population structure and spatial expansion pathways, providing key insights to inform targeted and effective invasive species management. However, fine-scale genetic studies elucidating the invasion processes remain scarce. This study investigates the local invasion dynamics of the avian-dispersed shrub Pyracantha angustifolia in a mountain basin of the Chaco Serrano, Córdoba, Argentina, integrating spatial distribution surveys with high-throughput RAD-sequencing genomic data. Sampling across an elevation gradient along a stream revealed species density decline with increasing elevation and distance from water, indicating recruitment hotspots near streams. Genetic analyses uncovered two distinct clusters with a patchy distribution, moderate differentiation and differing genetic diversity, suggesting at least two, genetically diverse, independent introductions. Kinship analyses, which compare shared genetic variants to identify familial ties, revealed pervasive familial relationships within clusters but none between them, indicating fine-scale kin structure driven by localized dispersal and lack of post-introduction interbreeding between groups. Partial Mantel tests indicated a weak isolation-by-distance pattern at the landscape scale, while dispersal kernel modeling, which estimates probability distributions of dispersal distances, supported predominance of short-distance dispersal and occasional longer dispersal events (up to the maximum sampled of approx. 6 km). The findings provide practical data to improve ongoing management and control strategies to preserve the invaded ecosystem.