From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands
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 mo...
Published in: | Frontiers in Marine Science |
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Frontiers Media SA
2021
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Online Access: | https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/ |
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ftarchimer:oai:archimer.ifremer.fr:85412 2023-05-15T17:02:04+02:00 From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands Kraft, Sebastián 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 2021-12 application/pdf https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/ eng eng Frontiers Media SA https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf doi:10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/ info:eu-repo/semantics/openAccess restricted use Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-12 , Vol. 8 , P. 782512 (11p.) Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.3389/fmars.2021.782512 2022-01-25T23:50:47Z 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. Article in Journal/Newspaper Kerguelen Islands Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Argentina Kerguelen Kerguelen Islands Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography |
spellingShingle |
Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography Kraft, Sebastián 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 From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands |
topic_facet |
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. |
format |
Article in Journal/Newspaper |
author |
Kraft, Sebastián 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_facet |
Kraft, Sebastián 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_sort |
Kraft, Sebastián |
title |
From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands |
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 |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/ |
geographic |
Argentina Kerguelen Kerguelen Islands |
geographic_facet |
Argentina Kerguelen Kerguelen Islands |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-12 , Vol. 8 , P. 782512 (11p.) |
op_relation |
https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf doi:10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3389/fmars.2021.782512 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1766055303290290176 |