From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/17553 |
Resumo: | Commerson’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. |
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spelling |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen IslandsDe colonos a subespécies: diferenciação genética nos golfinhos de Commerson entre a América do Sul e as Ilhas KerguelenCephalorhynchus commersoniiColonizationDivergenceLast glacial maximumMitochondrial DNAPhylogeographyCommerson’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.Frontiers Media SASapientiaKraft, SebastianPérez-Alvarez, MJoséOlavarría, CarlosMoraga, RodrigoBaker, C. ScottSteel, DebbieTixier, PaulGuinet, ChristopheViricel, AmeliaBrickle, PaulCosta, MarinaCrespo, EnriqueDurante, CristianLoizaga, RocioPoulin, Elie2022-02-15T14:24:06Z2021-122021-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/17553eng10.3389/fmars.2021.7825122296-7745info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:29:44Zoai:sapientia.ualg.pt:10400.1/17553Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:07:30.400923Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands De colonos a subespécies: diferenciação genética nos golfinhos de Commerson entre a América do Sul e as Ilhas Kerguelen |
title |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
spellingShingle |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands Kraft, Sebastian Cephalorhynchus commersonii Colonization Divergence Last glacial maximum Mitochondrial DNA Phylogeography |
title_short |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
title_full |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
title_fullStr |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
title_full_unstemmed |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
title_sort |
From settlers to subspecies: genetic differentiation in Commerson’s dolphins between South America and the Kerguelen Islands |
author |
Kraft, Sebastian |
author_facet |
Kraft, Sebastian Pérez-Alvarez, MJosé Olavarría, Carlos Moraga, Rodrigo Baker, C. Scott Steel, Debbie Tixier, Paul Guinet, Christophe Viricel, Amelia Brickle, Paul Costa, Marina Crespo, Enrique Durante, Cristian Loizaga, Rocio Poulin, Elie |
author_role |
author |
author2 |
Pérez-Alvarez, MJosé Olavarría, Carlos Moraga, Rodrigo Baker, C. Scott Steel, Debbie Tixier, Paul Guinet, Christophe Viricel, Amelia Brickle, Paul Costa, Marina Crespo, Enrique Durante, Cristian Loizaga, Rocio Poulin, Elie |
author2_role |
author author author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Kraft, Sebastian Pérez-Alvarez, MJosé Olavarría, Carlos Moraga, Rodrigo Baker, C. Scott Steel, Debbie Tixier, Paul Guinet, Christophe Viricel, Amelia Brickle, Paul Costa, Marina Crespo, Enrique Durante, Cristian Loizaga, Rocio Poulin, Elie |
dc.subject.por.fl_str_mv |
Cephalorhynchus commersonii Colonization Divergence Last glacial maximum Mitochondrial DNA Phylogeography |
topic |
Cephalorhynchus commersonii Colonization Divergence Last glacial maximum Mitochondrial DNA Phylogeography |
description |
Commerson’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. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12 2021-12-01T00:00:00Z 2022-02-15T14:24:06Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/17553 |
url |
http://hdl.handle.net/10400.1/17553 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.3389/fmars.2021.782512 2296-7745 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Frontiers Media SA |
publisher.none.fl_str_mv |
Frontiers Media SA |
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reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133319914323968 |