High connectivity of the crocodile shark between the atlantic and southwest indian oceans: highlights for conservation

dc.contributor.authorSilva Ferrette, Bruno Lopes da [UNESP]
dc.contributor.authorMendonca, Fernando Fernandes
dc.contributor.authorCoelho, Rui
dc.contributor.authorVasconcelos de Oliveira, Paulo Guilherme
dc.contributor.authorVieira Hazin, Fabio Hissa
dc.contributor.authorRomanov, Evgeny V.
dc.contributor.authorOliveira, Claudio [UNESP]
dc.contributor.authorSantos, Miguel Neves
dc.contributor.authorForesti, Fausto [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniv Algarve
dc.contributor.institutionUniv Fed Rural Pernambuco
dc.description.abstractAmong the various shark species that are captured as bycatch in commercial fishing operations, the group of pelagic sharks is still one of the least studied and known. Within those, the crocodile shark, Pseudocarcharias kamoharai, a small-sized lamnid shark, is occasionally caught by longline vessels in certain regions of the tropical oceans worldwide. However, the population dynamics of this species, as well as the impact of fishing mortality on its stocks, are still unknown, with the crocodile shark currently one of the least studied of all pelagic sharks. Given this, the present study aimed to assess the population structure of P. kamoharai in several regions of the Atlantic and Indian Oceans using genetic molecular markers. The nucleotide composition of the mitochondrial DNA control region of 255 individuals was analyzed, and 31 haplotypes were found, with an estimated diversity Hd = 0.627, and a nucleotide diversity pi = 0.00167. An analysis of molecular variance (AMOVA) revealed a fixation index phi(ST) = -0.01118, representing an absence of population structure among the sampled regions of the Atlantic Ocean, and between the Atlantic and Indian Oceans. These results show a high degree of gene flow between the studied areas, with a single genetic stock and reduced population variability. In panmictic populations, conservation efforts can be concentrated in more restricted areas, being these representative of the total biodiversity of the species. When necessary, this strategy could be applied to the genetic maintenance of P. kamoharai.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Biociencias Botucatu, Lab Biol &Genet Peixes, Sao Paulo, Brazil
dc.description.affiliationUniv Fed Sao Paulo, UNIFESP, Inst Mar, Dept Ciencias Mar, Santos, Brazil
dc.description.affiliationIPMA, IP, Olhao, Portugal
dc.description.affiliationUniv Algarve, Ctr Ciencias Mar, CCMAR, Faro, Portugal
dc.description.affiliationUniv Fed Rural Pernambuco, UFRPE, Dept Pesca &Aquicultura, Pernambuco, Recife, Brazil
dc.description.affiliationARDA, Ctr Tech Appui Peche ReUNionnaise CAP RUN, Le Port, Reunion
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Biociências, Departamento de Morfologia, Lab Biol &Genet Peixes, Sao Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT)
dc.description.sponsorshipIdFAPESP: 2011/23787-0
dc.description.sponsorshipIdFAPESP: 2010/51903-2
dc.description.sponsorshipIdFCT: SFRH/BPD/93936/2013
dc.identifier.citationPlos One. San Francisco: Public Library Science, v. 10, n. 2, p. 1-10, 2015.
dc.publisherPublic Library Science
dc.relation.ispartofPlos One
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titleHigh connectivity of the crocodile shark between the atlantic and southwest indian oceans: highlights for conservationen
dcterms.rightsHolderPublic Library Science
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt


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