The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals
Background: Antarctica is surrounded by the Antarctic Circumpolar Current (ACC), the largest and strongest current in the world. Despite its potential importance for shaping biogeographical patterns, the distribution and connectivity of deep-sea populations across the ACC remain poorly understood. I...
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ftubgiessen:oai:jlupub.ub.uni-giessen.de:jlupub/9189 2024-05-12T07:56:39+00:00 The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals Dueñas, Luisa F. Tracey, Dianne M. Crawford, Andrew J. Wilke, Thomas Alderslade, Phil Sánchez, Juan A. 2022-11-18T09:51:07Z application/pdf http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-121787 https://jlupub.ub.uni-giessen.de//handle/jlupub/9189 https://doi.org/10.22029/jlupub-8577 en eng http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-121787 https://jlupub.ub.uni-giessen.de//handle/jlupub/9189 http://dx.doi.org/10.22029/jlupub-8577 Namensnennung 3.0 International https://creativecommons.org/licenses/by/3.0/ Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea ddc:570 article 2022 ftubgiessen https://doi.org/10.22029/jlupub-8577 2024-04-17T09:56:48Z Background: Antarctica is surrounded by the Antarctic Circumpolar Current (ACC), the largest and strongest current in the world. Despite its potential importance for shaping biogeographical patterns, the distribution and connectivity of deep-sea populations across the ACC remain poorly understood. In this study we conducted the first assessment of phylogeographical patterns in deep-sea octocorals in the South Pacific and Southern Ocean, specifically a group of closely related bottlebrush octocorals (Primnoidae: Tokoprymno and Thourella), as a test case to study the effect of the ACC on the population structure of brooding species. We assessed the degree to which the ACC constitutes a barrier to gene flow between northern and southern populations and whether the onset of diversification of these corals coincides with the origin of the ACC (Oligocene-Miocene boundary). Results: Based on DNA sequences of two nuclear genes from 80 individuals and a combination of phylogeographic model-testing approaches we found a phylogenetic break corresponding to the spatial occurrence of the ACC. We also found significant genetic structure among our four regional populations. However, we uncovered shared haplotypes among certain population pairs, suggesting long-distance, asymmetrical migration. Our divergence time analyses indicated that the separation of amphi-ACC populations took place during the Middle Miocene around 12.6 million years ago, i.e., after the formation of the ACC. Conclusion: We suggest that the ACC constitutes a semi-permeable barrier to these deep-sea octocorals capable of separating and structuring populations, while allowing short periods of gene flow. The fluctuations in latitudinal positioning of the ACC during the Miocene likely contributed to the diversification of these octocorals. Additionally, we provide evidence that the populations from each of our four sampling regions could actually constitute different species. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean Publication Server of the Justus-Liebig-University of Giessen Antarctic Southern Ocean The Antarctic Pacific |
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Open Polar |
collection |
Publication Server of the Justus-Liebig-University of Giessen |
op_collection_id |
ftubgiessen |
language |
English |
topic |
Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea ddc:570 |
spellingShingle |
Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea ddc:570 Dueñas, Luisa F. Tracey, Dianne M. Crawford, Andrew J. Wilke, Thomas Alderslade, Phil Sánchez, Juan A. The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
topic_facet |
Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea ddc:570 |
description |
Background: Antarctica is surrounded by the Antarctic Circumpolar Current (ACC), the largest and strongest current in the world. Despite its potential importance for shaping biogeographical patterns, the distribution and connectivity of deep-sea populations across the ACC remain poorly understood. In this study we conducted the first assessment of phylogeographical patterns in deep-sea octocorals in the South Pacific and Southern Ocean, specifically a group of closely related bottlebrush octocorals (Primnoidae: Tokoprymno and Thourella), as a test case to study the effect of the ACC on the population structure of brooding species. We assessed the degree to which the ACC constitutes a barrier to gene flow between northern and southern populations and whether the onset of diversification of these corals coincides with the origin of the ACC (Oligocene-Miocene boundary). Results: Based on DNA sequences of two nuclear genes from 80 individuals and a combination of phylogeographic model-testing approaches we found a phylogenetic break corresponding to the spatial occurrence of the ACC. We also found significant genetic structure among our four regional populations. However, we uncovered shared haplotypes among certain population pairs, suggesting long-distance, asymmetrical migration. Our divergence time analyses indicated that the separation of amphi-ACC populations took place during the Middle Miocene around 12.6 million years ago, i.e., after the formation of the ACC. Conclusion: We suggest that the ACC constitutes a semi-permeable barrier to these deep-sea octocorals capable of separating and structuring populations, while allowing short periods of gene flow. The fluctuations in latitudinal positioning of the ACC during the Miocene likely contributed to the diversification of these octocorals. Additionally, we provide evidence that the populations from each of our four sampling regions could actually constitute different species. |
format |
Article in Journal/Newspaper |
author |
Dueñas, Luisa F. Tracey, Dianne M. Crawford, Andrew J. Wilke, Thomas Alderslade, Phil Sánchez, Juan A. |
author_facet |
Dueñas, Luisa F. Tracey, Dianne M. Crawford, Andrew J. Wilke, Thomas Alderslade, Phil Sánchez, Juan A. |
author_sort |
Dueñas, Luisa F. |
title |
The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
title_short |
The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
title_full |
The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
title_fullStr |
The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
title_full_unstemmed |
The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
title_sort |
antarctic circumpolar current as a diversification trigger for deep-sea octocorals |
publishDate |
2022 |
url |
http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-121787 https://jlupub.ub.uni-giessen.de//handle/jlupub/9189 https://doi.org/10.22029/jlupub-8577 |
geographic |
Antarctic Southern Ocean The Antarctic Pacific |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-121787 https://jlupub.ub.uni-giessen.de//handle/jlupub/9189 http://dx.doi.org/10.22029/jlupub-8577 |
op_rights |
Namensnennung 3.0 International https://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.22029/jlupub-8577 |
_version_ |
1798836827902181376 |