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...
Main Authors: | , , , , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
La Trobe
2022
|
Subjects: | |
Online Access: | https://dx.doi.org/10.26181/18516281.v1 https://opal.latrobe.edu.au/articles/journal_contribution/Evolutionary_innovations_in_Antarctic_brittle_stars_linked_to_glacial_refugia/18516281/1 |
id |
ftdatacite:10.26181/18516281.v1 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.26181/18516281.v1 2023-05-15T14:01:41+02:00 Evolutionary innovations in Antarctic brittle stars linked to glacial refugia Lau, SCY Strugnell, Jan Sands, CJ Silva, CNS Wilson, NG 2022 https://dx.doi.org/10.26181/18516281.v1 https://opal.latrobe.edu.au/articles/journal_contribution/Evolutionary_innovations_in_Antarctic_brittle_stars_linked_to_glacial_refugia/18516281/1 unknown La Trobe https://dx.doi.org/10.26181/18516281 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Uncategorized ScholarlyArticle article-journal Text Journal contribution 2022 ftdatacite https://doi.org/10.26181/18516281.v1 https://doi.org/10.26181/18516281 2022-02-09T12:27:51Z 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. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic Prydz Bay Scotia Sea Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Prydz Bay Scotia Sea Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Uncategorized |
spellingShingle |
Uncategorized Lau, SCY Strugnell, Jan Sands, CJ Silva, CNS Wilson, NG Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
topic_facet |
Uncategorized |
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 |
Other Non-Article Part of Journal/Newspaper |
author |
Lau, SCY Strugnell, Jan Sands, CJ Silva, CNS Wilson, NG |
author_facet |
Lau, SCY Strugnell, Jan Sands, CJ Silva, CNS Wilson, NG |
author_sort |
Lau, SCY |
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 |
La Trobe |
publishDate |
2022 |
url |
https://dx.doi.org/10.26181/18516281.v1 https://opal.latrobe.edu.au/articles/journal_contribution/Evolutionary_innovations_in_Antarctic_brittle_stars_linked_to_glacial_refugia/18516281/1 |
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_relation |
https://dx.doi.org/10.26181/18516281 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.26181/18516281.v1 https://doi.org/10.26181/18516281 |
_version_ |
1766271724587843584 |