Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data
Marine systems have traditionally been thought of as “open” with few barriers to gene flow. In particular, many marine organisms in the Southern Ocean purportedly possess circumpolar distributions that have rarely been well verified. Here, we use the highly abundant and endemic Southern Ocean brittl...
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ftdryad:oai:v1.datadryad.org:10255/dryad.129338 2023-05-15T13:31:24+02:00 Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data Galaska, Matthew P. Sands, Chester J. Santos, Scott R. Mahon, Andrew R. Halanych, Kenneth M. Antarctica 2016-12-19T20:43:09Z http://hdl.handle.net/10255/dryad.129338 https://doi.org/10.5061/dryad.0k1r0 unknown doi:10.5061/dryad.0k1r0/1 doi:10.5061/dryad.0k1r0/2 doi:10.5061/dryad.0k1r0/3 doi:10.1002/ece3.2617 doi:10.5061/dryad.0k1r0 2045-7758 http://hdl.handle.net/10255/dryad.129338 SNP RAD COI Phylogeography Population genetics Article 2016 ftdryad https://doi.org/10.5061/dryad.0k1r0 https://doi.org/10.5061/dryad.0k1r0/1 https://doi.org/10.5061/dryad.0k1r0/2 https://doi.org/10.5061/dryad.0k1r0/3 https://doi.org/10.1002/ece3.2617 2020-01-01T15:42:06Z Marine systems have traditionally been thought of as “open” with few barriers to gene flow. In particular, many marine organisms in the Southern Ocean purportedly possess circumpolar distributions that have rarely been well verified. Here, we use the highly abundant and endemic Southern Ocean brittle star Ophionotus victoriae to examine genetic structure and determine whether barriers to gene flow have existed around the Antarctic continent. Ophionotus victoriae possesses feeding planktotrophic larvae with presumed high dispersal capability, but a previous study revealed genetic structure along the Antarctic Peninsula. To test the extent of genetic differentiation within O. victoriae, we sampled from the Ross Sea through the eastern Weddell Sea. Whereas two mitochondrial DNA markers (16S rDNA and COI) were employed to allow comparison to earlier work, a 2b-RAD single-nucleotide polymorphism (SNP) approach allowed sampling of loci across the genome. Mitochondrial data from 414 individuals suggested three major lineages, but 2b-RAD data generated 1,999 biallelic loci that identified four geographically distinct groups from 89 samples. Given the greater resolution by SNP data, O. victoriae can be divided into geographically distinct populations likely representing multiple species. Specific historical scenarios that explain current population structure were examined with approximate Bayesian computation (ABC) analyses. Although the Bransfield Strait region shows high diversity possibly due to mixing, our results suggest that within the recent past, dispersal processes due to strong currents such as the Antarctic Circumpolar Current have not overcome genetic subdivision presumably due to historical isolation, questioning the idea of large open circumpolar populations in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Ross Sea Southern Ocean Weddell Sea Dryad Digital Repository (Duke University) Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Bransfield Strait Weddell |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
SNP RAD COI Phylogeography Population genetics |
spellingShingle |
SNP RAD COI Phylogeography Population genetics Galaska, Matthew P. Sands, Chester J. Santos, Scott R. Mahon, Andrew R. Halanych, Kenneth M. Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
topic_facet |
SNP RAD COI Phylogeography Population genetics |
description |
Marine systems have traditionally been thought of as “open” with few barriers to gene flow. In particular, many marine organisms in the Southern Ocean purportedly possess circumpolar distributions that have rarely been well verified. Here, we use the highly abundant and endemic Southern Ocean brittle star Ophionotus victoriae to examine genetic structure and determine whether barriers to gene flow have existed around the Antarctic continent. Ophionotus victoriae possesses feeding planktotrophic larvae with presumed high dispersal capability, but a previous study revealed genetic structure along the Antarctic Peninsula. To test the extent of genetic differentiation within O. victoriae, we sampled from the Ross Sea through the eastern Weddell Sea. Whereas two mitochondrial DNA markers (16S rDNA and COI) were employed to allow comparison to earlier work, a 2b-RAD single-nucleotide polymorphism (SNP) approach allowed sampling of loci across the genome. Mitochondrial data from 414 individuals suggested three major lineages, but 2b-RAD data generated 1,999 biallelic loci that identified four geographically distinct groups from 89 samples. Given the greater resolution by SNP data, O. victoriae can be divided into geographically distinct populations likely representing multiple species. Specific historical scenarios that explain current population structure were examined with approximate Bayesian computation (ABC) analyses. Although the Bransfield Strait region shows high diversity possibly due to mixing, our results suggest that within the recent past, dispersal processes due to strong currents such as the Antarctic Circumpolar Current have not overcome genetic subdivision presumably due to historical isolation, questioning the idea of large open circumpolar populations in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Galaska, Matthew P. Sands, Chester J. Santos, Scott R. Mahon, Andrew R. Halanych, Kenneth M. |
author_facet |
Galaska, Matthew P. Sands, Chester J. Santos, Scott R. Mahon, Andrew R. Halanych, Kenneth M. |
author_sort |
Galaska, Matthew P. |
title |
Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
title_short |
Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
title_full |
Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
title_fullStr |
Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
title_full_unstemmed |
Data from: Geographic structure in the Southern Ocean circumpolar brittle star Ophionotus victoriae (Ophiuridae) revealed from mtDNA and single nucleotide polymorphism data |
title_sort |
data from: geographic structure in the southern ocean circumpolar brittle star ophionotus victoriae (ophiuridae) revealed from mtdna and single nucleotide polymorphism data |
publishDate |
2016 |
url |
http://hdl.handle.net/10255/dryad.129338 https://doi.org/10.5061/dryad.0k1r0 |
op_coverage |
Antarctica |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Bransfield Strait Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Bransfield Strait Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Ross Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Ross Sea Southern Ocean Weddell Sea |
op_relation |
doi:10.5061/dryad.0k1r0/1 doi:10.5061/dryad.0k1r0/2 doi:10.5061/dryad.0k1r0/3 doi:10.1002/ece3.2617 doi:10.5061/dryad.0k1r0 2045-7758 http://hdl.handle.net/10255/dryad.129338 |
op_doi |
https://doi.org/10.5061/dryad.0k1r0 https://doi.org/10.5061/dryad.0k1r0/1 https://doi.org/10.5061/dryad.0k1r0/2 https://doi.org/10.5061/dryad.0k1r0/3 https://doi.org/10.1002/ece3.2617 |
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1766017878167912448 |