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Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic
The fossil record provides an invaluable insight into the temporal origins of extant lineages of organisms. However, establishing the relationships between fossils and extant lineages can be difficult in groups with low rates of morphological change over time. Molecular dating can potentially circum...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7302493/ https://www.ncbi.nlm.nih.gov/pubmed/32555586 http://dx.doi.org/10.1371/journal.pone.0227525 |
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author | Wood, Daniel Besnard, Guillaume Beerling, David J. Osborne, Colin P. Christin, Pascal-Antoine |
author_facet | Wood, Daniel Besnard, Guillaume Beerling, David J. Osborne, Colin P. Christin, Pascal-Antoine |
author_sort | Wood, Daniel |
collection | PubMed |
description | The fossil record provides an invaluable insight into the temporal origins of extant lineages of organisms. However, establishing the relationships between fossils and extant lineages can be difficult in groups with low rates of morphological change over time. Molecular dating can potentially circumvent this issue by allowing distant fossils to act as calibration points, but rate variation across large evolutionary scales can bias such analyses. In this study, we apply multiple dating methods to genome-wide datasets to infer the origin of extant species of Isoetes, a group of mostly aquatic and semi-aquatic isoetalean lycopsids, which closely resemble fossil forms dating back to the Triassic. Rate variation observed in chloroplast genomes hampers accurate dating, but genome-wide nuclear markers place the origin of extant diversity within this group in the mid-Paleogene, 45–60 million years ago. Our genomic analyses coupled with a careful evaluation of the fossil record indicate that despite resembling forms from the Triassic, extant Isoetes species do not represent the remnants of an ancient and widespread group, but instead have spread around the globe in the relatively recent past. |
format | Online Article Text |
id | pubmed-7302493 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-73024932020-06-19 Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic Wood, Daniel Besnard, Guillaume Beerling, David J. Osborne, Colin P. Christin, Pascal-Antoine PLoS One Research Article The fossil record provides an invaluable insight into the temporal origins of extant lineages of organisms. However, establishing the relationships between fossils and extant lineages can be difficult in groups with low rates of morphological change over time. Molecular dating can potentially circumvent this issue by allowing distant fossils to act as calibration points, but rate variation across large evolutionary scales can bias such analyses. In this study, we apply multiple dating methods to genome-wide datasets to infer the origin of extant species of Isoetes, a group of mostly aquatic and semi-aquatic isoetalean lycopsids, which closely resemble fossil forms dating back to the Triassic. Rate variation observed in chloroplast genomes hampers accurate dating, but genome-wide nuclear markers place the origin of extant diversity within this group in the mid-Paleogene, 45–60 million years ago. Our genomic analyses coupled with a careful evaluation of the fossil record indicate that despite resembling forms from the Triassic, extant Isoetes species do not represent the remnants of an ancient and widespread group, but instead have spread around the globe in the relatively recent past. Public Library of Science 2020-06-18 /pmc/articles/PMC7302493/ /pubmed/32555586 http://dx.doi.org/10.1371/journal.pone.0227525 Text en © 2020 Wood et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Wood, Daniel Besnard, Guillaume Beerling, David J. Osborne, Colin P. Christin, Pascal-Antoine Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title | Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title_full | Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title_fullStr | Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title_full_unstemmed | Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title_short | Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic |
title_sort | phylogenomics indicates the “living fossil” isoetes diversified in the cenozoic |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7302493/ https://www.ncbi.nlm.nih.gov/pubmed/32555586 http://dx.doi.org/10.1371/journal.pone.0227525 |
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