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<p>The Scalloped Hammerhead, <i>Sphyrna lewini</i>, is a large coastal pelagic shark species that inhabits tropical and subtropical waters around the world. It is listed as Critically Endangered by the International Union for Conservation of Nature (IUCN, Red List). In the present study, we used nine nuclear microsatellite DNA markers and sequences of the complete mitochondrial DNA genome to estimate the diversity and genetic structure of <i>S. lewini</i> in the Gulf of Mexico and to assess whether the genetic evidence supports philopatry within this geographic area. We sampled a total of 73 juvenile individuals from seven locations in the Northern (GMN) and Southern (GMS) Gulf of Mexico. Our results indicate low genetic diversity in the Gulf of Mexico population compared to previously studied populations, which could be related to the origin and colonization of the species. We detected genetic homogeneity in both types of markers, which suggests that philopatric behavior is unlikely in the studied area. Interestingly, the location La Pesca was genetically distinct from the rest of sampled locations, which may warrant special attention for conservation efforts.</p>

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Population genetics of the scalloped hammerhead shark (Sphyrna lewini) in the Gulf of Mexico: evaluating fine scale female philopatry and its importance for management and conservation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月30日

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  • Massiel Alfonso-González,
  • Alexander Llanes-Quevedo,
  • Adán F. Mar-Silva,
  • Raúl E. Lara-Mendoza,
  • Píndaro Díaz-Jaimes

摘要

The Scalloped Hammerhead, Sphyrna lewini, is a large coastal pelagic shark species that inhabits tropical and subtropical waters around the world. It is listed as Critically Endangered by the International Union for Conservation of Nature (IUCN, Red List). In the present study, we used nine nuclear microsatellite DNA markers and sequences of the complete mitochondrial DNA genome to estimate the diversity and genetic structure of S. lewini in the Gulf of Mexico and to assess whether the genetic evidence supports philopatry within this geographic area. We sampled a total of 73 juvenile individuals from seven locations in the Northern (GMN) and Southern (GMS) Gulf of Mexico. Our results indicate low genetic diversity in the Gulf of Mexico population compared to previously studied populations, which could be related to the origin and colonization of the species. We detected genetic homogeneity in both types of markers, which suggests that philopatric behavior is unlikely in the studied area. Interestingly, the location La Pesca was genetically distinct from the rest of sampled locations, which may warrant special attention for conservation efforts.