The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals
Abstract 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 under...
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ftdatacite:10.6084/m9.figshare.c.3598646.v1 2023-05-15T13:44:44+02:00 The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals DueĂąas, Luisa Tracey, Dianne Crawford, Andrew Wilke, Thomas Alderslade, Phil SĂĄnchez, Juan 2016 https://dx.doi.org/10.6084/m9.figshare.c.3598646.v1 https://figshare.com/collections/The_Antarctic_Circumpolar_Current_as_a_diversification_trigger_for_deep-sea_octocorals/3598646/1 unknown Figshare https://dx.doi.org/10.1186/s12862-015-0574-z https://dx.doi.org/10.6084/m9.figshare.c.3598646 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Genetics FOS Biological sciences Physiology Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology Collection article 2016 ftdatacite https://doi.org/10.6084/m9.figshare.c.3598646.v1 https://doi.org/10.1186/s12862-015-0574-z https://doi.org/10.6084/m9.figshare.c.3598646 2021-11-05T12:55:41Z Abstract 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 DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Pacific |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Genetics FOS Biological sciences Physiology Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology |
spellingShingle |
Genetics FOS Biological sciences Physiology Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology DueĂąas, Luisa Tracey, Dianne Crawford, Andrew Wilke, Thomas Alderslade, Phil SĂĄnchez, Juan The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals |
topic_facet |
Genetics FOS Biological sciences Physiology Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology |
description |
Abstract 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 |
DueĂąas, Luisa Tracey, Dianne Crawford, Andrew Wilke, Thomas Alderslade, Phil SĂĄnchez, Juan |
author_facet |
DueĂąas, Luisa Tracey, Dianne Crawford, Andrew Wilke, Thomas Alderslade, Phil SĂĄnchez, Juan |
author_sort |
DueĂąas, Luisa |
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 |
Figshare |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3598646.v1 https://figshare.com/collections/The_Antarctic_Circumpolar_Current_as_a_diversification_trigger_for_deep-sea_octocorals/3598646/1 |
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 |
https://dx.doi.org/10.1186/s12862-015-0574-z https://dx.doi.org/10.6084/m9.figshare.c.3598646 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3598646.v1 https://doi.org/10.1186/s12862-015-0574-z https://doi.org/10.6084/m9.figshare.c.3598646 |
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