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: |
2022
|
Subjects: | |
Online Access: | https://doi.org/10.26181/18516281.v1 |
id |
ftsmithonian:oai:figshare.com:article/18516281 |
---|---|
record_format |
openpolar |
spelling |
ftsmithonian:oai:figshare.com:article/18516281 2023-05-15T14:00:49+02:00 Evolutionary innovations in Antarctic brittle stars linked to glacial refugia SCY Lau (10109557) Jan Strugnell (9477710) CJ Sands (11953007) CNS Silva (10109563) NG Wilson (10109560) 2022-01-17T03:45:51Z https://doi.org/10.26181/18516281.v1 unknown https://figshare.com/articles/journal_contribution/Evolutionary_innovations_in_Antarctic_brittle_stars_linked_to_glacial_refugia/18516281 doi:10.26181/18516281.v1 CC BY 4.0 CC-BY Uncategorized Science & Technology Life Sciences & Biomedicine Ecology Evolutionary Biology Environmental Sciences & Ecology contrasting life histories evolutionary innovation glacial refugia morphological innovation population genetics SOUTHERN-OCEAN ECHINODERMATA-OPHIUROIDEA GENETIC-STRUCTURE MITOCHONDRIAL LINEAGES SPECIES DELIMITATION POPULATION-GENETICS CIRCUMPOLAR CURRENT CRYPTIC SPECIATION SEA BIODIVERSITY Text Journal contribution 2022 ftsmithonian https://doi.org/10.26181/18516281.v1 2022-01-21T13:05:21Z 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 Unknown Antarctic Prydz Bay Scotia Sea Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Uncategorized Science & Technology Life Sciences & Biomedicine Ecology Evolutionary Biology Environmental Sciences & Ecology contrasting life histories evolutionary innovation glacial refugia morphological innovation population genetics SOUTHERN-OCEAN ECHINODERMATA-OPHIUROIDEA GENETIC-STRUCTURE MITOCHONDRIAL LINEAGES SPECIES DELIMITATION POPULATION-GENETICS CIRCUMPOLAR CURRENT CRYPTIC SPECIATION SEA BIODIVERSITY |
spellingShingle |
Uncategorized Science & Technology Life Sciences & Biomedicine Ecology Evolutionary Biology Environmental Sciences & Ecology contrasting life histories evolutionary innovation glacial refugia morphological innovation population genetics SOUTHERN-OCEAN ECHINODERMATA-OPHIUROIDEA GENETIC-STRUCTURE MITOCHONDRIAL LINEAGES SPECIES DELIMITATION POPULATION-GENETICS CIRCUMPOLAR CURRENT CRYPTIC SPECIATION SEA BIODIVERSITY SCY Lau (10109557) Jan Strugnell (9477710) CJ Sands (11953007) CNS Silva (10109563) NG Wilson (10109560) Evolutionary innovations in Antarctic brittle stars linked to glacial refugia |
topic_facet |
Uncategorized Science & Technology Life Sciences & Biomedicine Ecology Evolutionary Biology Environmental Sciences & Ecology contrasting life histories evolutionary innovation glacial refugia morphological innovation population genetics SOUTHERN-OCEAN ECHINODERMATA-OPHIUROIDEA GENETIC-STRUCTURE MITOCHONDRIAL LINEAGES SPECIES DELIMITATION POPULATION-GENETICS CIRCUMPOLAR CURRENT CRYPTIC SPECIATION SEA BIODIVERSITY |
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 |
SCY Lau (10109557) Jan Strugnell (9477710) CJ Sands (11953007) CNS Silva (10109563) NG Wilson (10109560) |
author_facet |
SCY Lau (10109557) Jan Strugnell (9477710) CJ Sands (11953007) CNS Silva (10109563) NG Wilson (10109560) |
author_sort |
SCY Lau (10109557) |
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 |
publishDate |
2022 |
url |
https://doi.org/10.26181/18516281.v1 |
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://figshare.com/articles/journal_contribution/Evolutionary_innovations_in_Antarctic_brittle_stars_linked_to_glacial_refugia/18516281 doi:10.26181/18516281.v1 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.26181/18516281.v1 |
_version_ |
1766270155511300096 |