Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation
Abstract The porbeagle shark Lamna nasus is a large highly migratory shark distributed in cold and temperate marine waters of the North Atlantic and Southern Hemisphere (SH). According to the International Union for Conservation of Nature, the porbeagle is assessed globally as Vulnerable and regiona...
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crwiley:10.1002/aqc.3455 2024-09-15T18:17:22+00:00 Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation González, M. Teresa Sepúlveda, Fabiola A. Zárate, Patricia M. Baeza, J. Antonio 2020 http://dx.doi.org/10.1002/aqc.3455 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3455 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aqc.3455 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Aquatic Conservation: Marine and Freshwater Ecosystems volume 31, issue 3, page 620-634 ISSN 1052-7613 1099-0755 journal-article 2020 crwiley https://doi.org/10.1002/aqc.3455 2024-07-23T04:13:07Z Abstract The porbeagle shark Lamna nasus is a large highly migratory shark distributed in cold and temperate marine waters of the North Atlantic and Southern Hemisphere (SH). According to the International Union for Conservation of Nature, the porbeagle is assessed globally as Vulnerable and regionally as Critically Endangered in the North Atlantic and the Mediterranean Sea. This study explored, for the first time, the population genetics of L. nasus at a regional (south‐east Pacific Ocean) and global scale. In this study, the null hypotheses of no genetic discontinuities among populations (i) within the SH, and (ii) between the SH and Northern Hemisphere (NH) were tested. Also, the demographic history of L. nasus in different ocean basins was assessed. Two mitochondrial markers (Control Region [CR] and cox1 ) well suited for population genetics inferences in sharks were used. Spatial–genetic analyses suggested two genetic clusters co‐occurring in the south‐eastern Pacific Ocean. A two‐way ANOVA using the cox1 but not the CR mtDNA fragment detected an effect of genetic identity on shark body size. Phylogeographic analyses, haplotype networks, and analyses of molecular variance demonstrated genetic differences between populations from the NH and SH but not among populations in the SH. Migration estimates indicated limited current maternal gene flow between the two hemispheres but high gene flow within hemispheres. Two well‐defined haplotype groups with star‐like shapes inhabited all ocean basins in the SH. These results could reflect a historical scenario of reproductive isolation and more recent mixture among previously isolated populations in the SH. A Bayesian skyline plot analysis indicated sudden population expansion in the SH occurring ~100–125 kya. This study highlights the need for additional studies focusing on the population genomics (using nuclear markers, i.e. single nucleotide polymorphisms) and the general biology of L. nasus to explore the existence of genetically dissimilar populations in the SH. ... Article in Journal/Newspaper Lamna nasus North Atlantic Porbeagle Wiley Online Library Aquatic Conservation: Marine and Freshwater Ecosystems 31 3 620 634 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The porbeagle shark Lamna nasus is a large highly migratory shark distributed in cold and temperate marine waters of the North Atlantic and Southern Hemisphere (SH). According to the International Union for Conservation of Nature, the porbeagle is assessed globally as Vulnerable and regionally as Critically Endangered in the North Atlantic and the Mediterranean Sea. This study explored, for the first time, the population genetics of L. nasus at a regional (south‐east Pacific Ocean) and global scale. In this study, the null hypotheses of no genetic discontinuities among populations (i) within the SH, and (ii) between the SH and Northern Hemisphere (NH) were tested. Also, the demographic history of L. nasus in different ocean basins was assessed. Two mitochondrial markers (Control Region [CR] and cox1 ) well suited for population genetics inferences in sharks were used. Spatial–genetic analyses suggested two genetic clusters co‐occurring in the south‐eastern Pacific Ocean. A two‐way ANOVA using the cox1 but not the CR mtDNA fragment detected an effect of genetic identity on shark body size. Phylogeographic analyses, haplotype networks, and analyses of molecular variance demonstrated genetic differences between populations from the NH and SH but not among populations in the SH. Migration estimates indicated limited current maternal gene flow between the two hemispheres but high gene flow within hemispheres. Two well‐defined haplotype groups with star‐like shapes inhabited all ocean basins in the SH. These results could reflect a historical scenario of reproductive isolation and more recent mixture among previously isolated populations in the SH. A Bayesian skyline plot analysis indicated sudden population expansion in the SH occurring ~100–125 kya. This study highlights the need for additional studies focusing on the population genomics (using nuclear markers, i.e. single nucleotide polymorphisms) and the general biology of L. nasus to explore the existence of genetically dissimilar populations in the SH. ... |
format |
Article in Journal/Newspaper |
author |
González, M. Teresa Sepúlveda, Fabiola A. Zárate, Patricia M. Baeza, J. Antonio |
spellingShingle |
González, M. Teresa Sepúlveda, Fabiola A. Zárate, Patricia M. Baeza, J. Antonio Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
author_facet |
González, M. Teresa Sepúlveda, Fabiola A. Zárate, Patricia M. Baeza, J. Antonio |
author_sort |
González, M. Teresa |
title |
Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
title_short |
Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
title_full |
Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
title_fullStr |
Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
title_full_unstemmed |
Regional population genetics and global phylogeography of the endangered highly migratory shark Lamna nasus: Implications for fishery management and conservation |
title_sort |
regional population genetics and global phylogeography of the endangered highly migratory shark lamna nasus: implications for fishery management and conservation |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/aqc.3455 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3455 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aqc.3455 |
genre |
Lamna nasus North Atlantic Porbeagle |
genre_facet |
Lamna nasus North Atlantic Porbeagle |
op_source |
Aquatic Conservation: Marine and Freshwater Ecosystems volume 31, issue 3, page 620-634 ISSN 1052-7613 1099-0755 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/aqc.3455 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
31 |
container_issue |
3 |
container_start_page |
620 |
op_container_end_page |
634 |
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1810455389312909312 |