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<p>The olive ridley (<i>Lepidochelys olivacea</i>), listed as “vulnerable” by both the IUCN and the Brazilian Government, faces numerous threats that include marine pollution and bycatch in fisheries. Despite a growing olive ridley nesting population along the Southwest Atlantic (SWA) coast, there are significant gaps in knowledge regarding its genetic diversity, population connectivity, and natal origins in feeding grounds. This study assessed the genetic diversity and connectivity of seven <i>L. olivacea</i> groups along the Brazilian and Uruguayan coasts through mitochondrial DNA Control Region analysis. For the first time in the SWA, Mixed Stock Analysis (MSA) was used to estimate the natal origins of olive ridleys in feeding areas. Four haplotypes, previously reported in the Atlantic Basin, were identified, and all populations showed low haplotype and nucleotide diversities. We identified three cases of hybridization likely involving olive ridley males and three other sea turtle species. Low genetic structure was observed between American and African populations, and moderate genetic structure was observed between two Brazilian nesting grounds– Bahia and Sergipe– which had not been found in previous research. MSA results indicated that the feeding aggregations from Rio Grande do Sul/Uruguay, Rio de Janeiro, and Ceará were composed of animals originating mainly from the Angola rookery, followed by Sergipe. Meanwhile, the Alagoas aggregation was composed of animals originating mostly from Sergipe, followed by Angola. The low genetic diversity observed may indicate reduced adaptability to climate change, while high intraoceanic connectivity highlights the need for strengthened international collaboration.</p>

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Genetic diversity, population structure and natal origins of the Olive ridley sea turtle (Lepidochelys olivacea) in the Southwest Atlantic Ocean

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Igor Peres Puertas,
  • Brenda Foerste,
  • Sérgio C. Estima,
  • Andrine P. da Silva,
  • Bruno S.S.P. Oliveira,
  • Victor J.A. Patiri,
  • Romoaldo S. Gaspar,
  • Jaqueline C. de Castilhos,
  • Eduardo H.S.M. Lima,
  • Alexsandro S. dos Santos,
  • Daniella T. de Almeida,
  • Gustavo D. Stahelin,
  • Gabriela M. Vélez-Rubio,
  • Sarah M. Vargas,
  • Danielle S. Monteiro,
  • Maíra C. Proietti

摘要

The olive ridley (Lepidochelys olivacea), listed as “vulnerable” by both the IUCN and the Brazilian Government, faces numerous threats that include marine pollution and bycatch in fisheries. Despite a growing olive ridley nesting population along the Southwest Atlantic (SWA) coast, there are significant gaps in knowledge regarding its genetic diversity, population connectivity, and natal origins in feeding grounds. This study assessed the genetic diversity and connectivity of seven L. olivacea groups along the Brazilian and Uruguayan coasts through mitochondrial DNA Control Region analysis. For the first time in the SWA, Mixed Stock Analysis (MSA) was used to estimate the natal origins of olive ridleys in feeding areas. Four haplotypes, previously reported in the Atlantic Basin, were identified, and all populations showed low haplotype and nucleotide diversities. We identified three cases of hybridization likely involving olive ridley males and three other sea turtle species. Low genetic structure was observed between American and African populations, and moderate genetic structure was observed between two Brazilian nesting grounds– Bahia and Sergipe– which had not been found in previous research. MSA results indicated that the feeding aggregations from Rio Grande do Sul/Uruguay, Rio de Janeiro, and Ceará were composed of animals originating mainly from the Angola rookery, followed by Sergipe. Meanwhile, the Alagoas aggregation was composed of animals originating mostly from Sergipe, followed by Angola. The low genetic diversity observed may indicate reduced adaptability to climate change, while high intraoceanic connectivity highlights the need for strengthened international collaboration.