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<p>Sharks are keystone apex predators that play a crucial role in maintaining marine ecosystem stability, but are vulnerable to overexploitation due to their unique life history traits. This study investigates the genetic diversity and population structure of the shortfin mako (<i>Isurus oxyrinchus</i>) and the porbeagle shark (<i>Lamna nasus</i>) in the Chilean Exclusive Economic Zone (EEZ), using thousands of SNPs across 90 and 86 individuals, respectively. Our results revealed no significant spatial genetic structure for either species, suggesting they form single genetic populations along the Chilean coast. Demographic inference suggests similar historical population trends for both species, with growth occurring approximately 6,000–10,000 years ago, followed by a period of stability and a gradual decline from 200 years ago to the present. The ongoing population decline underscores the need for effective conservation strategies. The findings underscore the importance of treating <i>I. oxyrinchus</i> and <i>L. nasus</i> as single genetic units within Chilean waters to inform comprehensive conservation efforts. This study provides essential baseline data for the sustainable management of these economically significant shark species, emphasizing the need to reduce bycatch and enforce sustainable fishing practices.</p>

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Lack of spatial genetic structure in shortfin mako (Isurus oxyrinchus) and porbeagle shark (Lamna nasus) in the Chilean Exclusive Economic Zone

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Pablo Dufflocq,
  • Noemi Rojas-Hernández,
  • Ilia Cari,
  • Patricia Zárate,
  • Cristian B. Canales-Aguirre,
  • David Véliz,
  • María Angélica Larraín,
  • Cristian Araneda

摘要

Sharks are keystone apex predators that play a crucial role in maintaining marine ecosystem stability, but are vulnerable to overexploitation due to their unique life history traits. This study investigates the genetic diversity and population structure of the shortfin mako (Isurus oxyrinchus) and the porbeagle shark (Lamna nasus) in the Chilean Exclusive Economic Zone (EEZ), using thousands of SNPs across 90 and 86 individuals, respectively. Our results revealed no significant spatial genetic structure for either species, suggesting they form single genetic populations along the Chilean coast. Demographic inference suggests similar historical population trends for both species, with growth occurring approximately 6,000–10,000 years ago, followed by a period of stability and a gradual decline from 200 years ago to the present. The ongoing population decline underscores the need for effective conservation strategies. The findings underscore the importance of treating I. oxyrinchus and L. nasus as single genetic units within Chilean waters to inform comprehensive conservation efforts. This study provides essential baseline data for the sustainable management of these economically significant shark species, emphasizing the need to reduce bycatch and enforce sustainable fishing practices.