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Genetic diversity and historical demography of Atlantic bigeye tuna (Thunnus obesus)

2006Journal article Restricted access
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dc.contributor.authorMartinez, P.
dc.contributor.authorGonzalez, Elena G.
dc.contributor.authorCastilho, Rita
dc.contributor.authorZardoya, R.
dc.date.accessioned2014-05-20T13:15:24Z
dc.date.available2014-05-20T13:15:24Z
dc.date.issued2006
dc.date.updated2014-05-16T09:39:50Z
dc.description.abstractBigeye (Thunnus obesus) is a large, pelagic, and migratory species of tuna that inhabits tropical and temperate marine waters worldwide. Previous studies based on mitochondrial RFLP data have shown that bigeye tunas from the Atlantic Ocean are the most interesting from a genetic point of view. Two highly divergent mitochondrial haplotype clades (I and II) coexist in the Atlantic Ocean. One is almost exclusive of the Atlantic Ocean whereas the other is also found in the Indo-PaciWc Ocean. Bigeye tuna from the Atlantic Ocean is currently managed as a single stock, although this assumption remains untested at the genetic level. Therefore, genetic diversity was determined at the mitochondrial control region to test the null hypothesis of no population structure in bigeye tuna from the Atlantic Ocean. A total of 331 specimens were sampled from four locations in the Atlantic Ocean (Canada, Azores, Canary Islands, and Gulf of Guinea), and one in the Indian and PaciWc Oceans, respectively. The reconstructed neighbor-joining phylogeny conWrmed the presence of Clades I and II throughout the Atlantic Ocean. No apparent latitudinal gradient of the proportions of both clades in the diVerent collection sites was observed. Hierarchical AMOVA tests and pairwise ST comparisons involving Atlantic Ocean Clades I and II were consistent with a single stock of bigeye tuna in the Atlantic Ocean. Population genetic analyses considering phylogroups independently supported gene Xow within Clade II throughout the Atlantic Ocean, and within Clade I between Atlantic and Indo-PaciWc Oceans. The latter result suggests present uni-directional gene Xow from the Indo-PaciWc into the Atlantic Ocean. Moreover, mismatch analyses dated divergence of Clades I and II during the Pleistocene, as previously proposed. In addition, migration rates were estimated using coalescent methods, and showed a net migration from Atlantic Ocean feeding grounds towards the Gulf of Guinea, the best-known spawning ground of Atlantic bigeye tuna.por
dc.identifier.citationMartinez, P.; Gonzalez, E. G.; Castilho, R.; Zardoya, R. Genetic diversity and historical demography of Atlantic bigeye tuna (Thunnus obesus), Molecular Phylogenetics and Evolution, 39, 2, 404-416, 2006.por
dc.identifier.doihttp://dx.doi.org/10.1016/j.ympev.2005.07.022
dc.identifier.issn1055-7903
dc.identifier.otherAUT: RCA00270;
dc.identifier.urihttp://hdl.handle.net/10400.1/4021
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectPopulation geneticspor
dc.subjectMitochondrial control regionpor
dc.subjectBigeye tunapor
dc.subjectDemographypor
dc.titleGenetic diversity and historical demography of Atlantic bigeye tuna (Thunnus obesus)por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage416por
oaire.citation.issue2por
oaire.citation.startPage404por
oaire.citation.titleMolecular Phylogenetics and Evolutionpor
oaire.citation.volume39por
person.familyNameCastilho
person.givenNameRita
person.identifier452212
person.identifier.ciencia-id0513-0407-A6C1
person.identifier.orcid0000-0003-0727-3688
person.identifier.ridB-6185-2008
person.identifier.scopus-author-id56271196600
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication051f68ec-18e0-4008-b06d-bf4b996fa098
relation.isAuthorOfPublication.latestForDiscovery051f68ec-18e0-4008-b06d-bf4b996fa098

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