Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star
Poecilogony, or multiple developmental modes in a single species, is exceedingly rare. Several species described as poecilogenous were later demonstrated to be multiple (cryptic) species with a different developmental mode. The Southern Ocean is known to harbor a high proportion of brooders (Thorson...
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ftnerc:oai:nora.nerc.ac.uk:523331 2024-06-02T07:56:02+00:00 Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star Jossart, Quentin Sands, Chester J. Sewell, Mary A. 2019-11-09 http://nora.nerc.ac.uk/id/eprint/523331/ https://www.nature.com/articles/s41437-019-0228-9 unknown Springer Nature Jossart, Quentin; Sands, Chester J. orcid:0000-0003-1028-0328 Sewell, Mary A. 2019 Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star. Heredity, 123 (5). 622-633. https://doi.org/10.1038/s41437-019-0228-9 <https://doi.org/10.1038/s41437-019-0228-9> Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1038/s41437-019-0228-9 2024-05-07T23:32:29Z Poecilogony, or multiple developmental modes in a single species, is exceedingly rare. Several species described as poecilogenous were later demonstrated to be multiple (cryptic) species with a different developmental mode. The Southern Ocean is known to harbor a high proportion of brooders (Thorson’s Rule) but with an increasing number of counter examples over recent years. Here we evaluated poecilogony vs. crypticism in the brittle star Astrotoma agassizii across the Southern Ocean. This species was initially described from South America as a brooder before some pelagic stages were identified in Antarctica. Reproductive and mitochondrial data were combined to unravel geographic and genetic variation of developmental modes. Our results indicate that A. agassizii is composed of seven well-supported and deeply divergent clades (I: Antarctica and South Georgia; II: South Georgia and Sub-Antarctic locations including Kerguelen, Patagonian shelf, and New Zealand; III-VI-VII: Patagonian shelf, IV-V: South Georgia). Two of these clades demonstrated strong size dimorphism when in sympatry and can be linked to differing developmental modes (Clade V: dwarf brooder vs. Clade I: giant broadcaster). Based on their restricted geographic distributions and on previous studies, it is likely that Clades III-VI-VII are brooders. Clade II is composed of different morphological species, A. agassizii and A. drachi, the latter originally used as the outgroup. By integrating morphology, reproductive, and molecular data we conclude that the variation identified in A. agassizii is best described as crypticism rather than poecilogony. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Kerguelen New Zealand Southern Ocean Heredity 123 5 622 633 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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Poecilogony, or multiple developmental modes in a single species, is exceedingly rare. Several species described as poecilogenous were later demonstrated to be multiple (cryptic) species with a different developmental mode. The Southern Ocean is known to harbor a high proportion of brooders (Thorson’s Rule) but with an increasing number of counter examples over recent years. Here we evaluated poecilogony vs. crypticism in the brittle star Astrotoma agassizii across the Southern Ocean. This species was initially described from South America as a brooder before some pelagic stages were identified in Antarctica. Reproductive and mitochondrial data were combined to unravel geographic and genetic variation of developmental modes. Our results indicate that A. agassizii is composed of seven well-supported and deeply divergent clades (I: Antarctica and South Georgia; II: South Georgia and Sub-Antarctic locations including Kerguelen, Patagonian shelf, and New Zealand; III-VI-VII: Patagonian shelf, IV-V: South Georgia). Two of these clades demonstrated strong size dimorphism when in sympatry and can be linked to differing developmental modes (Clade V: dwarf brooder vs. Clade I: giant broadcaster). Based on their restricted geographic distributions and on previous studies, it is likely that Clades III-VI-VII are brooders. Clade II is composed of different morphological species, A. agassizii and A. drachi, the latter originally used as the outgroup. By integrating morphology, reproductive, and molecular data we conclude that the variation identified in A. agassizii is best described as crypticism rather than poecilogony. |
format |
Article in Journal/Newspaper |
author |
Jossart, Quentin Sands, Chester J. Sewell, Mary A. |
spellingShingle |
Jossart, Quentin Sands, Chester J. Sewell, Mary A. Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
author_facet |
Jossart, Quentin Sands, Chester J. Sewell, Mary A. |
author_sort |
Jossart, Quentin |
title |
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
title_short |
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
title_full |
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
title_fullStr |
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
title_full_unstemmed |
Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star |
title_sort |
dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an antarctic brittle star |
publisher |
Springer Nature |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/523331/ https://www.nature.com/articles/s41437-019-0228-9 |
geographic |
Antarctic Kerguelen New Zealand Southern Ocean |
geographic_facet |
Antarctic Kerguelen New Zealand Southern Ocean |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
Jossart, Quentin; Sands, Chester J. orcid:0000-0003-1028-0328 Sewell, Mary A. 2019 Dwarf brooder versus giant broadcaster: combining genetic and reproductive data to unravel cryptic diversity in an Antarctic brittle star. Heredity, 123 (5). 622-633. https://doi.org/10.1038/s41437-019-0228-9 <https://doi.org/10.1038/s41437-019-0228-9> |
op_doi |
https://doi.org/10.1038/s41437-019-0228-9 |
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Heredity |
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123 |
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5 |
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622 |
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633 |
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1800753011012665344 |