Evolutionary innovations in Antarctic brittle stars linked to glacial refugia
The drivers behind evolutionary innovations such as contrasting life histories and morphological change are central questions of evolutionary biology. However, the environmental and ecological contexts linked to evolutionary innovations are generally unclear. During the Pleistocene glacial cycles, g...
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ftpubmed:oai:pubmedcentral.nih.gov:8668817 2023-05-15T13:46:33+02:00 Evolutionary innovations in Antarctic brittle stars linked to glacial refugia Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. 2021-11-29 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668817/ http://www.ncbi.nlm.nih.gov/pubmed/34938519 https://doi.org/10.1002/ece3.8376 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668817/ http://www.ncbi.nlm.nih.gov/pubmed/34938519 http://dx.doi.org/10.1002/ece3.8376 © 2021 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Ecol Evol Research Articles Text 2021 ftpubmed https://doi.org/10.1002/ece3.8376 2021-12-26T01:30:27Z The drivers behind evolutionary innovations such as contrasting life histories and morphological change are central questions of evolutionary biology. However, the environmental and ecological contexts linked to evolutionary innovations are generally unclear. During the Pleistocene glacial cycles, grounded ice sheets expanded across the Southern Ocean continental shelf. Limited ice‐free areas remained, and fauna were isolated from other refugial populations. Survival in Southern Ocean refugia could present opportunities for ecological adaptation and evolutionary innovation. Here, we reconstructed the phylogeographic patterns of circum‐Antarctic brittle stars Ophionotus victoriae and O. hexactis with contrasting life histories (broadcasting vs brooding) and morphology (5 vs 6 arms). We examined the evolutionary relationship between the two species using cytochrome c oxidase subunit I (COI) data. COI data suggested that O. victoriae is a single species (rather than a species complex) and is closely related to O. hexactis (a separate species). Since their recent divergence in the mid‐Pleistocene, O. victoriae and O. hexactis likely persisted differently throughout glacial maxima, in deep‐sea and Antarctic island refugia, respectively. Genetic connectivity, within and between the Antarctic continental shelf and islands, was also observed and could be linked to the Antarctic Circumpolar Current and local oceanographic regimes. Signatures of a probable seascape corridor linking connectivity between the Scotia Sea and Prydz Bay are also highlighted. We suggest that survival in Antarctic island refugia was associated with increase in arm number and a switch from broadcast spawning to brooding in O. hexactis, and propose that it could be linked to environmental changes (such as salinity) associated with intensified interglacial‐glacial cycles. Text Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean PubMed Central (PMC) Antarctic Prydz Bay Scotia Sea Southern Ocean The Antarctic Ecology and Evolution 11 23 17428 17446 |
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Research Articles |
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Research Articles Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
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Research Articles |
description |
The drivers behind evolutionary innovations such as contrasting life histories and morphological change are central questions of evolutionary biology. However, the environmental and ecological contexts linked to evolutionary innovations are generally unclear. During the Pleistocene glacial cycles, grounded ice sheets expanded across the Southern Ocean continental shelf. Limited ice‐free areas remained, and fauna were isolated from other refugial populations. Survival in Southern Ocean refugia could present opportunities for ecological adaptation and evolutionary innovation. Here, we reconstructed the phylogeographic patterns of circum‐Antarctic brittle stars Ophionotus victoriae and O. hexactis with contrasting life histories (broadcasting vs brooding) and morphology (5 vs 6 arms). We examined the evolutionary relationship between the two species using cytochrome c oxidase subunit I (COI) data. COI data suggested that O. victoriae is a single species (rather than a species complex) and is closely related to O. hexactis (a separate species). Since their recent divergence in the mid‐Pleistocene, O. victoriae and O. hexactis likely persisted differently throughout glacial maxima, in deep‐sea and Antarctic island refugia, respectively. Genetic connectivity, within and between the Antarctic continental shelf and islands, was also observed and could be linked to the Antarctic Circumpolar Current and local oceanographic regimes. Signatures of a probable seascape corridor linking connectivity between the Scotia Sea and Prydz Bay are also highlighted. We suggest that survival in Antarctic island refugia was associated with increase in arm number and a switch from broadcast spawning to brooding in O. hexactis, and propose that it could be linked to environmental changes (such as salinity) associated with intensified interglacial‐glacial cycles. |
format |
Text |
author |
Lau, Sally C. Y. Strugnell, Jan M. Sands, Chester J. Silva, Catarina N. S. Wilson, Nerida G. |
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 |
Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
title_short |
Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
title_full |
Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
title_fullStr |
Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
title_full_unstemmed |
Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
title_sort |
evolutionary innovations in antarctic brittle stars linked to glacial refugia |
publisher |
John Wiley and Sons Inc. |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668817/ http://www.ncbi.nlm.nih.gov/pubmed/34938519 https://doi.org/10.1002/ece3.8376 |
geographic |
Antarctic Prydz Bay Scotia Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Prydz Bay Scotia Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean |
op_source |
Ecol Evol |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668817/ http://www.ncbi.nlm.nih.gov/pubmed/34938519 http://dx.doi.org/10.1002/ece3.8376 |
op_rights |
© 2021 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.8376 |
container_title |
Ecology and Evolution |
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11 |
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23 |
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17428 |
op_container_end_page |
17446 |
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1766244138117758976 |