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<p>Madagascar is home to seven endemic baobab species in the genus <i>Adansonia</i>, all threatened by climate change, habitat destruction, and deforestation. Previous studies have highlighted the vulnerability of baobabs, particularly <i>A. suarezensis</i> in northern Madagascar, which is predicted to face extinction by 2080 under current environmental and anthropogenic pressures. This study provides a comprehensive analysis of <i>A. suarezensis</i> genetic structure and demographic history using genome-wide Single Nucleotide Polymorphism (SNP) data from seven populations across inland, northern, and southern regions of its range, offering insights into evidence-based conservation strategies. The results reveal moderate genetic diversity and evidence of inbreeding among populations, with significant genetic differentiation between inland and coastal populations. Three genetic clusters are identified: coastal, inland, and the southernmost Mahory population. Inland populations show higher admixture, while the highest inbreeding is observed in Ambilo and Cap d’Ambre. Demographic analyses revealed stronger and more ancient bottleneck events in the southern population, and more recent, moderate contractions in the rest of populations. The genetic patterns and demographic history are discussed in relation to past climatic and geological events, habitat availability, and pollination and seed dispersal ecology. This study contributes to a more detailed characterization of the genetic structure of <i>A. suarezensis</i> populations, emphasizing the role of genetic dynamics in conservation. It provides a basis for habitat restoration and targeted management strategies aimed at preserving the species’ evolutionary potential and ensuring its long-term survival.</p>

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Genetic diversity and conservation insights for Adansonia suarezensis in Northern Madagascar: a whole genome SNP analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Onja Hariveloniaina Morilline Razanamaro,
  • Dario La Montagna,
  • Fabio Attorre,
  • Elisa Rondoni,
  • Francesco Buttarazzi,
  • Tahiana Andriaharimalala,
  • Naoko Ishikawa,
  • Mengying Cai,
  • Yoshihisa Suyama,
  • Laura Parducci,
  • Marilena Marconi

摘要

Madagascar is home to seven endemic baobab species in the genus Adansonia, all threatened by climate change, habitat destruction, and deforestation. Previous studies have highlighted the vulnerability of baobabs, particularly A. suarezensis in northern Madagascar, which is predicted to face extinction by 2080 under current environmental and anthropogenic pressures. This study provides a comprehensive analysis of A. suarezensis genetic structure and demographic history using genome-wide Single Nucleotide Polymorphism (SNP) data from seven populations across inland, northern, and southern regions of its range, offering insights into evidence-based conservation strategies. The results reveal moderate genetic diversity and evidence of inbreeding among populations, with significant genetic differentiation between inland and coastal populations. Three genetic clusters are identified: coastal, inland, and the southernmost Mahory population. Inland populations show higher admixture, while the highest inbreeding is observed in Ambilo and Cap d’Ambre. Demographic analyses revealed stronger and more ancient bottleneck events in the southern population, and more recent, moderate contractions in the rest of populations. The genetic patterns and demographic history are discussed in relation to past climatic and geological events, habitat availability, and pollination and seed dispersal ecology. This study contributes to a more detailed characterization of the genetic structure of A. suarezensis populations, emphasizing the role of genetic dynamics in conservation. It provides a basis for habitat restoration and targeted management strategies aimed at preserving the species’ evolutionary potential and ensuring its long-term survival.