Genetic connectivity and phylogeography of the night shark (Carcharhinus signatus) in the western Atlantic Ocean: Implications for conservation management

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dc.contributor.authorDomingues, Rodrigo R. [UNESP]
dc.contributor.authorBruels, Christine C.
dc.contributor.authorGadig, Otto B.F. [UNESP]
dc.contributor.authorChapman, Demian D.
dc.contributor.authorHilsdorf, Alexandre W.S.
dc.contributor.authorShivji, Mahmood S.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNova Southeastern University
dc.contributor.institutionFlorida International University
dc.contributor.institutionUniversidade de Mogi das Cruzes
dc.date.accessioned2018-12-11T17:22:44Z
dc.date.available2018-12-11T17:22:44Z
dc.date.issued2018-01-01
dc.description.abstractThe night shark, Carcharhinus signatus, is a mesopelagic, semi-oceanic shark species found only in the Atlantic Ocean. It is one of the most frequently caught sharks in pelagic longline fisheries and is classified as Vulnerable by the International Union for the Conservation of Nature (IUCN). Despite their prevalence in commercial fisheries, the population genetic structure of the night shark has not been assessed. The present study investigated the genetic diversity, genetic connectivity, and phylogeography of the species throughout the western Atlantic Ocean, based on complete mitochondrial control region (mtCR) sequence data (n = 152) and genotypic data from nine nuclear microsatellites (n = 119). The mtCR sequence revealed 19 haplotypes, with overall haplotype and nucleotide diversities of 0.74 (±0.027) and 0.0034 (±0.0019), respectively, whereas the nuclear microsatellite observed and expected heterozygosities were 0.408 and 0.421, respectively. There was significant population structure (ФST = 0.429; P < 0.01) and isolation by distance (r = 0.65, P = 0.03) based on mtCR sequence data, but no genetic differentiation based on nuclear microsatellite analyses. The phylogenetic analyses support the existence of two matrilineal lineages, which diverged during the Pleistocene. Mitochondrial demographic analyses indicated a historical bottleneck effect followed by population expansion during the Pleistocene, whereas nuclear microsatellites did not detect a recent or a strong bottleneck. For conservation purposes, we advocate that the species should be considered to comprise at least two management units (MUs) in the western Atlantic Ocean. MU-specific catch quotas should be implemented throughout the range of the species given its low genetic diversity and vulnerability to overexploitation.en
dc.description.affiliationInstituto de Biociências de Rio Claro Universidade Estadual Paulista – UNESP
dc.description.affiliationSave Our Seas Shark Research Center USA and Guy Harvey Research Institute Nova Southeastern University
dc.description.affiliationLaboratório de Pesquisa de Elasmobrânquios Instituto de Biociências Universidade Estadual Paulista – UNESP, Campus do Litoral Paulista
dc.description.affiliationDepartment of Biological Sciences Florida International University
dc.description.affiliationNúcleo Integrado de Biotecnologia Universidade de Mogi das Cruzes, PO BOX 411
dc.description.affiliationUnespInstituto de Biociências de Rio Claro Universidade Estadual Paulista – UNESP
dc.description.affiliationUnespLaboratório de Pesquisa de Elasmobrânquios Instituto de Biociências Universidade Estadual Paulista – UNESP, Campus do Litoral Paulista
dc.identifierhttp://dx.doi.org/10.1002/aqc.2961
dc.identifier.citationAquatic Conservation: Marine and Freshwater Ecosystems.
dc.identifier.doi10.1002/aqc.2961
dc.identifier.issn1099-0755
dc.identifier.issn1052-7613
dc.identifier.lattes2161551575581523
dc.identifier.orcid0000-0001-8423-7299
dc.identifier.scopus2-s2.0-85053385743
dc.identifier.urihttp://hdl.handle.net/11449/176845
dc.language.isoeng
dc.relation.ispartofAquatic Conservation: Marine and Freshwater Ecosystems
dc.relation.ispartofsjr1,203
dc.relation.ispartofsjr1,203
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectconservation evaluation
dc.subjectdispersal
dc.subjectfish
dc.subjectfisheries management
dc.subjectgene flow
dc.subjectgenetic diversity
dc.titleGenetic connectivity and phylogeography of the night shark (Carcharhinus signatus) in the western Atlantic Ocean: Implications for conservation managementen
dc.typeArtigo
unesp.author.lattes2161551575581523[3]
unesp.author.orcid0000-0002-8979-645X[1]
unesp.author.orcid0000-0001-8423-7299[3]

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