Recurrent juvenile stranding of the porbeagle shark Lamna nasus along the South West Atlantic coast

• Chiaramonte, Gustavo Enrique ^[2] ; Alarcos, Ana Julia ^[3] ; Vazquez, Diego Martin ^[3] ; Bovcon, Nelson Dario ^[1] ; Delpiani, Sergio Matias ^[3] ; Chavez, Leandro Nahuel ^[4] ; Dellacasa, Ruben Francisco ^[4] ; Mabragaña, Ezequiel ^[3]
  1. [1] Universidad Nacional de la Patagonia San Juan Bosco

     Universidad Nacional de la Patagonia San Juan Bosco

     Argentina

     
  2. [2] MACN
  3. [3] Universidad Nacional de Mar del Plata–CONICET
  4. [4] Albatross Task Force Argentina, Programa Marino, Aves Argentinas/Asociación Ornitológica del Plata

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• Localización: Revista del Museo Argentino de Ciencias Naturales, ISSN-e 1853-0400, ISSN 1514-5158, Vol. 26, Nº. 2, 2024, pág. 2
• Idioma: inglés
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• Resumen

  • Strandings of juvenile porbeagles are recurrent in the South West Atlantic (SWA). We provide new biological information and explore to which haplogroups the juveniles may belong. Fourteen stranding events occurred between May 2009 and May 2022 on porbeagle in the beaches of the SWA Argentine coast were identified. Based on a 2019 beached specimen, total length, 83 morphometric measures, and the parasites diversity were provided, as well the COI gene sequences, derived from DNA extraction from muscle tissue, followed by PCR. The sequence matched Lamna nasus (98.76% – 100.00%; n=100), using the Barcode of Life Data System identification. Molecular data show a great genetic diversity  in COI sequences, especially between northern and southern hemisphere samples, in accordance with previous studies. In addition, juveniles recorded in northern Argentine coastal waters differ in COI nucleotide sequences and are located in different clusters in the maximum likelihood (ML) analysis. The haplotype network built showed a star-shaped topology and, as the ML tree, revealed the existence of three genetically distinct clusters. A partition of the genetic variation into Southern Hemisphere and Northern Hemisphere groups was observed.