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...
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Online Access: | https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://archimer.ifremer.fr/doc/00742/85412/ |
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fttriple:oai:gotriple.eu:10670/1.iqsmvs 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 https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://archimer.ifremer.fr/doc/00742/85412/ en eng Frontiers Media SA doi:10.3389/fmars.2021.782512 10670/1.iqsmvs https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://archimer.ifremer.fr/doc/00742/85412/ Archimer, archive institutionnelle de l'Ifremer Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-12 , Vol. 8 , P. 782512 (11p.) envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.3389/fmars.2021.782512 2023-01-22T17:02:02Z 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. Text Kerguelen Islands Unknown Argentina Kerguelen Kerguelen Islands Frontiers in Marine Science 8 |
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envir geo 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 |
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envir geo |
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 |
Text |
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 |
url |
https://doi.org/10.3389/fmars.2021.782512 https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf 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 |
Archimer, archive institutionnelle de l'Ifremer Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-12 , Vol. 8 , P. 782512 (11p.) |
op_relation |
doi:10.3389/fmars.2021.782512 10670/1.iqsmvs https://archimer.ifremer.fr/doc/00742/85412/90474.pdf https://archimer.ifremer.fr/doc/00742/85412/90475.pdf https://archimer.ifremer.fr/doc/00742/85412/ |
op_doi |
https://doi.org/10.3389/fmars.2021.782512 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1766055305353887744 |