Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars
Abstract Understanding the drivers of evolutionary innovation provides a crucial perspective of how evolutionary processes unfold across taxa and ecological systems. It has been hypothesised that the Southern Ocean provided ecological opportunities for novelty in the past. However, the drivers of in...
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Online Access: | http://dx.doi.org/10.1111/mec.16951 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16951 |
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crwiley:10.1111/mec.16951 2024-09-30T14:24:37+00:00 Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. Australian Academy of Science Australian Research Council University of South Alabama 2023 http://dx.doi.org/10.1111/mec.16951 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16951 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ http://creativecommons.org/licenses/by-nc/4.0/ Molecular Ecology volume 32, issue 13, page 3382-3402 ISSN 0962-1083 1365-294X journal-article 2023 crwiley https://doi.org/10.1111/mec.16951 2024-09-11T04:13:27Z Abstract Understanding the drivers of evolutionary innovation provides a crucial perspective of how evolutionary processes unfold across taxa and ecological systems. It has been hypothesised that the Southern Ocean provided ecological opportunities for novelty in the past. However, the drivers of innovation are challenging to pinpoint as the evolutionary genetics of Southern Ocean fauna are influenced by Quaternary glacial–interglacial cycles, oceanic currents and species ecology. Here we examined the genome‐wide single nucleotide polymorphisms of the Southern Ocean brittle stars Ophionotus victoriae (five arms, broadcaster) and O. hexactis (six arms, brooder). We found that O. victoriae and O. hexactis are closely‐related species with interspecific gene flow. During the late Pleistocene, O. victoriae likely persisted in a connected deep water refugium and in situ refugia on the Antarctic continental shelf and around Antarctic islands; O. hexactis persisted exclusively within in situ island refugia. Within O. victoriae , contemporary gene flow linking to the Antarctic Circumpolar Current, regional gyres and other local oceanographic regimes was observed. Gene flow connecting West and East Antarctic islands near the Polar Front was also detected in O. hexactis . A strong association was detected between outlier loci and salinity in O. hexactis . Both O. victoriae and O. hexactis are associated with genome‐wide increase in alleles at intermediate‐frequencies; the alleles associated with this peak appear to be species specific, and these intermediate‐frequency variants are far more excessive in O. hexactis . We hypothesise that the peak in alleles at intermediate frequencies could be related to adaptation in the recent past, linked to evolutionary innovations of increase in arm number and a switch to brooding from broadcasting, in O. hexactis . Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Wiley Online Library Antarctic Southern Ocean The Antarctic Molecular Ecology 32 13 3382 3402 |
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Wiley Online Library |
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English |
description |
Abstract Understanding the drivers of evolutionary innovation provides a crucial perspective of how evolutionary processes unfold across taxa and ecological systems. It has been hypothesised that the Southern Ocean provided ecological opportunities for novelty in the past. However, the drivers of innovation are challenging to pinpoint as the evolutionary genetics of Southern Ocean fauna are influenced by Quaternary glacial–interglacial cycles, oceanic currents and species ecology. Here we examined the genome‐wide single nucleotide polymorphisms of the Southern Ocean brittle stars Ophionotus victoriae (five arms, broadcaster) and O. hexactis (six arms, brooder). We found that O. victoriae and O. hexactis are closely‐related species with interspecific gene flow. During the late Pleistocene, O. victoriae likely persisted in a connected deep water refugium and in situ refugia on the Antarctic continental shelf and around Antarctic islands; O. hexactis persisted exclusively within in situ island refugia. Within O. victoriae , contemporary gene flow linking to the Antarctic Circumpolar Current, regional gyres and other local oceanographic regimes was observed. Gene flow connecting West and East Antarctic islands near the Polar Front was also detected in O. hexactis . A strong association was detected between outlier loci and salinity in O. hexactis . Both O. victoriae and O. hexactis are associated with genome‐wide increase in alleles at intermediate‐frequencies; the alleles associated with this peak appear to be species specific, and these intermediate‐frequency variants are far more excessive in O. hexactis . We hypothesise that the peak in alleles at intermediate frequencies could be related to adaptation in the recent past, linked to evolutionary innovations of increase in arm number and a switch to brooding from broadcasting, in O. hexactis . |
author2 |
Australian Academy of Science Australian Research Council University of South Alabama |
format |
Article in Journal/Newspaper |
author |
Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. |
spellingShingle |
Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
author_facet |
Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. |
author_sort |
Lau, Sally C. Y. |
title |
Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
title_short |
Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
title_full |
Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
title_fullStr |
Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
title_full_unstemmed |
Genomic insights of evolutionary divergence and life history innovations in Antarctic brittle stars |
title_sort |
genomic insights of evolutionary divergence and life history innovations in antarctic brittle stars |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/mec.16951 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16951 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Molecular Ecology volume 32, issue 13, page 3382-3402 ISSN 0962-1083 1365-294X |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1111/mec.16951 |
container_title |
Molecular Ecology |
container_volume |
32 |
container_issue |
13 |
container_start_page |
3382 |
op_container_end_page |
3402 |
_version_ |
1811641684873707520 |