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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ftnerc:oai:nora.nerc.ac.uk:531495 2023-05-15T13:41:46+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. 2021-12-13 text http://nora.nerc.ac.uk/id/eprint/531495/ https://nora.nerc.ac.uk/id/eprint/531495/1/ece3.8376.pdf https://onlinelibrary.wiley.com/doi/10.1002/ece3.8376 en eng Wiley https://nora.nerc.ac.uk/id/eprint/531495/1/ece3.8376.pdf Lau, Sally C.Y.; Strugnell, Jan M.; Sands, Chester J. orcid:0000-0003-1028-0328 Silva, Catarina N.S.; Wilson, Nerida G. 2021 Evolutionary innovations in Antarctic brittle stars linked to glacial refugia. Ecology and Evolution, 11 (23). 17428-17446. https://doi.org/10.1002/ece3.8376 <https://doi.org/10.1002/ece3.8376> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1002/ece3.8376 2023-02-04T19:52:47Z 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. Article in Journal/Newspaper Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Scotia Sea Prydz Bay Ecology and Evolution 11 23 17428 17446 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 |
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. Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
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 |
Wiley |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/531495/ https://nora.nerc.ac.uk/id/eprint/531495/1/ece3.8376.pdf https://onlinelibrary.wiley.com/doi/10.1002/ece3.8376 |
geographic |
Antarctic Southern Ocean The Antarctic Scotia Sea Prydz Bay |
geographic_facet |
Antarctic Southern Ocean The Antarctic Scotia Sea Prydz Bay |
genre |
Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/531495/1/ece3.8376.pdf Lau, Sally C.Y.; Strugnell, Jan M.; Sands, Chester J. orcid:0000-0003-1028-0328 Silva, Catarina N.S.; Wilson, Nerida G. 2021 Evolutionary innovations in Antarctic brittle stars linked to glacial refugia. Ecology and Evolution, 11 (23). 17428-17446. https://doi.org/10.1002/ece3.8376 <https://doi.org/10.1002/ece3.8376> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.8376 |
container_title |
Ecology and Evolution |
container_volume |
11 |
container_issue |
23 |
container_start_page |
17428 |
op_container_end_page |
17446 |
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1766157676357615616 |