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:geb.uni-giessen.de:12178 2023-05-15T13:56:27+02:00 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. Department of Animal Ecology & Systematics 2016 application/pdf http://nbn-resolving.org/urn:nbn:de:hebis:26-opus-121787 http://geb.uni-giessen.de/geb/volltexte/2016/12178/ eng eng Justus-Liebig-Universität Gießen FB 08 - Biologie und Chemie. Biologie http://creativecommons.org/licenses/by/3.0/de/deed.de?la=de CC-BY BMC Evolutionary Biology 16:2 doi:10.1186/s12862-015-0574-z Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea Life sciences Article 2016 ftubgiessen 2019-08-13T06:57:36Z 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 Pacific Southern Ocean The Antarctic |
institution |
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 Life sciences |
spellingShingle |
Antarctic Circumpolar Current gene flow primnoid octocorals Southern Ocean deep-sea Life sciences 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 Life sciences |
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. |
author2 |
Department of Animal Ecology & Systematics |
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 |
publisher |
Justus-Liebig-Universität Gießen |
publishDate |
2016 |
url |
http://nbn-resolving.org/urn:nbn:de:hebis:26-opus-121787 http://geb.uni-giessen.de/geb/volltexte/2016/12178/ |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
BMC Evolutionary Biology 16:2 doi:10.1186/s12862-015-0574-z |
op_rights |
http://creativecommons.org/licenses/by/3.0/de/deed.de?la=de |
op_rightsnorm |
CC-BY |
_version_ |
1766263957012611072 |