Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF
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.s001 |
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ftsmithonian:oai:figshare.com:article/17170613 2023-05-15T17:02:07+02:00 Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF Sebastián Kraft (11829425) MJosé Pérez-Alvarez (11829428) Carlos Olavarría (727870) Rodrigo Moraga (727871) C. Scott Baker (178898) Debbie Steel (3262806) Paul Tixier (9597794) Christophe Guinet (172101) Amelia Viricel (3285105) Paul Brickle (228540) Marina Costa (5073269) Enrique Crespo (3264930) Cristian Durante (11829431) Rocio Loizaga (11829434) Elie Poulin (524670) 2021-12-13T04:58:23Z https://doi.org/10.3389/fmars.2021.782512.s001 unknown https://figshare.com/articles/figure/Image_1_From_Settlers_to_Subspecies_Genetic_Differentiation_in_Commerson_s_Dolphins_Between_South_America_and_the_Kerguelen_Islands_PDF/17170613 doi:10.3389/fmars.2021.782512.s001 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography Image Figure 2021 ftsmithonian https://doi.org/10.3389/fmars.2021.782512.s001 2021-12-19T19:37:59Z 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. Still Image Kerguelen Islands Unknown Argentina Kerguelen Kerguelen Islands |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Cephalorhynchus commersonii colonization divergence last glacial maximum mitochondrial DNA phylogeography Sebastián Kraft (11829425) MJosé Pérez-Alvarez (11829428) Carlos Olavarría (727870) Rodrigo Moraga (727871) C. Scott Baker (178898) Debbie Steel (3262806) Paul Tixier (9597794) Christophe Guinet (172101) Amelia Viricel (3285105) Paul Brickle (228540) Marina Costa (5073269) Enrique Crespo (3264930) Cristian Durante (11829431) Rocio Loizaga (11829434) Elie Poulin (524670) Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering 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 |
Still Image |
author |
Sebastián Kraft (11829425) MJosé Pérez-Alvarez (11829428) Carlos Olavarría (727870) Rodrigo Moraga (727871) C. Scott Baker (178898) Debbie Steel (3262806) Paul Tixier (9597794) Christophe Guinet (172101) Amelia Viricel (3285105) Paul Brickle (228540) Marina Costa (5073269) Enrique Crespo (3264930) Cristian Durante (11829431) Rocio Loizaga (11829434) Elie Poulin (524670) |
author_facet |
Sebastián Kraft (11829425) MJosé Pérez-Alvarez (11829428) Carlos Olavarría (727870) Rodrigo Moraga (727871) C. Scott Baker (178898) Debbie Steel (3262806) Paul Tixier (9597794) Christophe Guinet (172101) Amelia Viricel (3285105) Paul Brickle (228540) Marina Costa (5073269) Enrique Crespo (3264930) Cristian Durante (11829431) Rocio Loizaga (11829434) Elie Poulin (524670) |
author_sort |
Sebastián Kraft (11829425) |
title |
Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
title_short |
Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
title_full |
Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
title_fullStr |
Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
title_full_unstemmed |
Image_1_From Settlers to Subspecies: Genetic Differentiation in Commerson’s Dolphins Between South America and the Kerguelen Islands.PDF |
title_sort |
image_1_from settlers to subspecies: genetic differentiation in commerson’s dolphins between south america and the kerguelen islands.pdf |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.782512.s001 |
geographic |
Argentina Kerguelen Kerguelen Islands |
geographic_facet |
Argentina Kerguelen Kerguelen Islands |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_relation |
https://figshare.com/articles/figure/Image_1_From_Settlers_to_Subspecies_Genetic_Differentiation_in_Commerson_s_Dolphins_Between_South_America_and_the_Kerguelen_Islands_PDF/17170613 doi:10.3389/fmars.2021.782512.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2021.782512.s001 |
_version_ |
1766055373139083264 |