Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.

<h4>Background</h4>Quantifying genetic diversity and metapopulation structure provides insights into the evolutionary history of a species and helps develop appropriate management strategies. We provide the first assessment of genetic structure in spinner sharks (Carcharhinus brevipinna)...

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Autores principales:	Pascal T Geraghty, Jane E Williamson, William G Macbeth, Sabine P Wintner, Alastair V Harry, Jennifer R Ovenden, Michael R Gillings
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b33fe7f882bb45f7bc36b018ac8296a7
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spelling	oai:doaj.org-article:b33fe7f882bb45f7bc36b018ac8296a72021-11-18T08:53:46ZPopulation expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.1932-620310.1371/journal.pone.0075169https://doaj.org/article/b33fe7f882bb45f7bc36b018ac8296a72013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24086462/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Quantifying genetic diversity and metapopulation structure provides insights into the evolutionary history of a species and helps develop appropriate management strategies. We provide the first assessment of genetic structure in spinner sharks (Carcharhinus brevipinna), a large cosmopolitan carcharhinid, sampled from eastern and northern Australia and South Africa.<h4>Methods and findings</h4>Sequencing of the mitochondrial DNA NADH dehydrogenase subunit 4 gene for 430 individuals revealed 37 haplotypes and moderately high haplotype diversity (h = 0.6770 ±0.025). While two metrics of genetic divergence (ΦST and F ST) revealed somewhat different results, subdivision was detected between South Africa and all Australian locations (pairwise ΦST, range 0.02717-0.03508, p values ≤ 0.0013; pairwise F ST South Africa vs New South Wales = 0.04056, p = 0.0008). Evidence for fine-scale genetic structuring was also detected along Australia's east coast (pairwise ΦST = 0.01328, p < 0.015), and between south-eastern and northern locations (pairwise ΦST = 0.00669, p < 0.04).<h4>Conclusions</h4>The Indian Ocean represents a robust barrier to contemporary gene flow in C. brevipinna between Australia and South Africa. Gene flow also appears restricted along a continuous continental margin in this species, with data tentatively suggesting the delineation of two management units within Australian waters. Further sampling, however, is required for a more robust evaluation of the latter finding. Evidence indicates that all sampled populations were shaped by a substantial demographic expansion event, with the resultant high genetic diversity being cause for optimism when considering conservation of this commercially-targeted species in the southern Indo-Pacific.Pascal T GeraghtyJane E WilliamsonWilliam G MacbethSabine P WintnerAlastair V HarryJennifer R OvendenMichael R GillingsPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 9, p e75169 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pascal T Geraghty Jane E Williamson William G Macbeth Sabine P Wintner Alastair V Harry Jennifer R Ovenden Michael R Gillings Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
description	<h4>Background</h4>Quantifying genetic diversity and metapopulation structure provides insights into the evolutionary history of a species and helps develop appropriate management strategies. We provide the first assessment of genetic structure in spinner sharks (Carcharhinus brevipinna), a large cosmopolitan carcharhinid, sampled from eastern and northern Australia and South Africa.<h4>Methods and findings</h4>Sequencing of the mitochondrial DNA NADH dehydrogenase subunit 4 gene for 430 individuals revealed 37 haplotypes and moderately high haplotype diversity (h = 0.6770 ±0.025). While two metrics of genetic divergence (ΦST and F ST) revealed somewhat different results, subdivision was detected between South Africa and all Australian locations (pairwise ΦST, range 0.02717-0.03508, p values ≤ 0.0013; pairwise F ST South Africa vs New South Wales = 0.04056, p = 0.0008). Evidence for fine-scale genetic structuring was also detected along Australia's east coast (pairwise ΦST = 0.01328, p < 0.015), and between south-eastern and northern locations (pairwise ΦST = 0.00669, p < 0.04).<h4>Conclusions</h4>The Indian Ocean represents a robust barrier to contemporary gene flow in C. brevipinna between Australia and South Africa. Gene flow also appears restricted along a continuous continental margin in this species, with data tentatively suggesting the delineation of two management units within Australian waters. Further sampling, however, is required for a more robust evaluation of the latter finding. Evidence indicates that all sampled populations were shaped by a substantial demographic expansion event, with the resultant high genetic diversity being cause for optimism when considering conservation of this commercially-targeted species in the southern Indo-Pacific.
format	article
author	Pascal T Geraghty Jane E Williamson William G Macbeth Sabine P Wintner Alastair V Harry Jennifer R Ovenden Michael R Gillings
author_facet	Pascal T Geraghty Jane E Williamson William G Macbeth Sabine P Wintner Alastair V Harry Jennifer R Ovenden Michael R Gillings
author_sort	Pascal T Geraghty
title	Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
title_short	Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
title_full	Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
title_fullStr	Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
title_full_unstemmed	Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.
title_sort	population expansion and genetic structure in carcharhinus brevipinna in the southern indo-pacific.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/b33fe7f882bb45f7bc36b018ac8296a7
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Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific.

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