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From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands

2021-12Journal article Open access
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dc.contributor.authorKraft, Sebastian
dc.contributor.authorPérez-Alvarez, MJosé
dc.contributor.authorOlavarría, Carlos
dc.contributor.authorMoraga, Rodrigo
dc.contributor.authorBaker, C. Scott
dc.contributor.authorSteel, Debbie
dc.contributor.authorTixier, Paul
dc.contributor.authorGuinet, Christophe
dc.contributor.authorViricel, Amelia
dc.contributor.authorBrickle, Paul
dc.contributor.authorCosta, Marina
dc.contributor.authorCrespo, Enrique
dc.contributor.authorDurante, Cristian
dc.contributor.authorLoizaga, Rocio
dc.contributor.authorPoulin, Elie
dc.date.accessioned2022-02-15T14:24:06Z
dc.date.available2022-02-15T14:24:06Z
dc.date.issued2021-12
dc.description.abstractCommerson’s dolphins (Cephalorhynchus commersonii) are separated into the subspecies C. c. commersonii, found along southern South America (SA) and the Falkland Islands/Islas Malvinas (FI/IM), and C. c. kerguelenensis, restricted to the subantarctic Kerguelen Islands (KI). Following the dispersal model proposed for the genus, the latter is thought to have originated from SA after a long-distance dispersal event. To evaluate this biogeographic scenario, a distribution-wide, balanced sampling of mitochondrial DNA (mtDNA) control region sequences was designed. New tissue samples from southern Chile, Argentina, FI/IM, and KI were added to published sequences from SA and KI, for a total of 256 samples. Genetic diversity indices, genetic and phylogeographic structure, and migration rates were calculated. One haplotype was shared between subspecies, with which all haplotypes of C. c. kerguelenensis formed a distinct group in the haplotype network. A new haplotype for C. c. kerguelenensis is reported. Differentiation in haplotype frequencies was found among localities within the distribution of C. c. commersonii, yet the phylogeographic signal was only statistically significant between subspecies. Coalescent-based historical gene flow estimations indicated migration between the northern and southern portions of the species’ range in SA as well as between SA and the FI/IM, but not between these and the KI. The net nucleotide divergence between dolphins from SA and the FI/IM was lower than the recommended threshold value suggested for delimiting subspecies, unlike that found between C. c. commersonii and C. c. kerguelenensis. The results are consistent with the model of post-glacial colonization of KI by South American C. commersonii, followed by an ongoing divergence process and subspecies status. Thus, C. c. kerguelenensis may represent the most recent diversification step of Cephalorhynchus, where isolation from their source population is driving a process of incipient speciation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fmars.2021.782512pt_PT
dc.identifier.eissn2296-7745
dc.identifier.urihttp://hdl.handle.net/10400.1/17553
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Media SApt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectCephalorhynchus commersoniipt_PT
dc.subjectColonizationpt_PT
dc.subjectDivergencept_PT
dc.subjectLast glacial maximumpt_PT
dc.subjectMitochondrial DNApt_PT
dc.subjectPhylogeographypt_PT
dc.titleFrom settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islandspt_PT
dc.title.alternativeDe colonos a subespécies: diferenciação genética nos golfinhos de Commerson entre a América do Sul e as Ilhas Kerguelenpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume8pt_PT
person.familyNameKraft
person.givenNameSebastian
person.identifier1363783
person.identifier.ciencia-id8314-284D-BD05
person.identifier.orcid0000-0003-0719-8040
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication497bf6a3-8bdd-406d-9761-998248f5b331
relation.isAuthorOfPublication.latestForDiscovery497bf6a3-8bdd-406d-9761-998248f5b331

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