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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ftpubmed:oai:pubmedcentral.nih.gov:6972741 2023-05-15T13:58:32+02:00 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. 2019-05-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6972741/ http://www.ncbi.nlm.nih.gov/pubmed/31073238 https://doi.org/10.1038/s41437-019-0228-9 en eng Springer International Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6972741/ http://www.ncbi.nlm.nih.gov/pubmed/31073238 http://dx.doi.org/10.1038/s41437-019-0228-9 © The Genetics Society 2019 Heredity (Edinb) Article Text 2019 ftpubmed https://doi.org/10.1038/s41437-019-0228-9 2020-11-08T01:30:25Z 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. Text Antarc* Antarctic Antarctica Southern Ocean PubMed Central (PMC) Antarctic Kerguelen New Zealand Southern Ocean Heredity 123 5 622 633 |
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Article 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 |
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Article |
description |
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 |
Text |
author |
Jossart, Quentin Sands, Chester J. Sewell, Mary A. |
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 International Publishing |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6972741/ http://www.ncbi.nlm.nih.gov/pubmed/31073238 https://doi.org/10.1038/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_source |
Heredity (Edinb) |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6972741/ http://www.ncbi.nlm.nih.gov/pubmed/31073238 http://dx.doi.org/10.1038/s41437-019-0228-9 |
op_rights |
© The Genetics Society 2019 |
op_doi |
https://doi.org/10.1038/s41437-019-0228-9 |
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123 |
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5 |
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622 |
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