Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation
This study uses a molecular-dating approach to test hypotheses about die biogeography of Nothofagus. The molecular modelling suggests that the present-day subgenera and species date from a radiation that most likely commenced between 55 and 40 Myr ago. This rules out the possibility of a reconciled...
Published in: | Proceedings of the Royal Society B: Biological Sciences |
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Online Access: | http://hdl.handle.net/1885/79873 https://doi.org/10.1098/rspb.2005.3219 https://openresearch-repository.anu.edu.au/bitstream/1885/79873/5/MigratedxPub8238_2005.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/79873/7/01_Cook_Not_so_ancient%3A_the_extant_2005.pdf.jpg |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/79873 2024-01-14T10:02:21+01:00 Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation Cook, Lynette Crisp, Michael http://hdl.handle.net/1885/79873 https://doi.org/10.1098/rspb.2005.3219 https://openresearch-repository.anu.edu.au/bitstream/1885/79873/5/MigratedxPub8238_2005.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/79873/7/01_Cook_Not_so_ancient%3A_the_extant_2005.pdf.jpg unknown Royal Society of London 0962-8452 http://hdl.handle.net/1885/79873 doi:10.1098/rspb.2005.3219 https://openresearch-repository.anu.edu.au/bitstream/1885/79873/5/MigratedxPub8238_2005.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/79873/7/01_Cook_Not_so_ancient%3A_the_extant_2005.pdf.jpg Proceedings of the Royal Society of London Series B: Biological Sciences Keywords: biogeography divergence Gondwana molecular analysis vicariance article Australia Australia and New Zealand biogeography cell lineage confidence interval conflict error fossil genus New Caledonia New Zealand nonhuman pollen priority jour Biogeography Dispersal Molecular dating Nothofagus Journal article ftanucanberra https://doi.org/10.1098/rspb.2005.3219 2023-12-15T09:34:48Z This study uses a molecular-dating approach to test hypotheses about die biogeography of Nothofagus. The molecular modelling suggests that the present-day subgenera and species date from a radiation that most likely commenced between 55 and 40 Myr ago. This rules out the possibility of a reconciled all-vicariance hypothesis for the biogeography of extant Nothofagus. However, the molecular dates for divergences between Australasian and South American taxa are consistent with the rifting of Australia and South America from Antarctica. The molecular dates further suggest a dispersal of subgenera Lophozonia and Fuscospora between Australia and New Zealand after the onset of the Antarctic Circumpolar Current and west wind drift. It appears likely that the New Caledonian lineage of subgenus Brassospora diverged from the New Guinean lineage elsewhere, prior to colonizing New Caledonia. The molecular approach strongly supports fossil-based estimates that Nothofagus diverged from the rest of Fagales more than 84 Myr ago. However, the mid-Cenozoic estimate for the diversification of the four extant subgenera conflicts with the palynological interpretation because pollen fossils, attributed to all four extant subgenera, were widespread across the Weddellian province of Gondwana about 71 Myr ago. The discrepancy between the pollen and molecular dates exists even when confidence intervals from several sources of error are taken into account. In contrast, the molecular age estimates are consistent with macrofossil dates. The incongruence between pollen fossils and molecular dates could be resolved if the early pollen types represent extinct lineages, with similar types later evolving independently in the extant lineages. Article in Journal/Newspaper Antarc* Antarctic Antarctica Australian National University: ANU Digital Collections Antarctic The Antarctic New Zealand Proceedings of the Royal Society B: Biological Sciences 272 1580 2535 2544 |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
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unknown |
topic |
Keywords: biogeography divergence Gondwana molecular analysis vicariance article Australia Australia and New Zealand biogeography cell lineage confidence interval conflict error fossil genus New Caledonia New Zealand nonhuman pollen priority jour Biogeography Dispersal Molecular dating Nothofagus |
spellingShingle |
Keywords: biogeography divergence Gondwana molecular analysis vicariance article Australia Australia and New Zealand biogeography cell lineage confidence interval conflict error fossil genus New Caledonia New Zealand nonhuman pollen priority jour Biogeography Dispersal Molecular dating Nothofagus Cook, Lynette Crisp, Michael Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
topic_facet |
Keywords: biogeography divergence Gondwana molecular analysis vicariance article Australia Australia and New Zealand biogeography cell lineage confidence interval conflict error fossil genus New Caledonia New Zealand nonhuman pollen priority jour Biogeography Dispersal Molecular dating Nothofagus |
description |
This study uses a molecular-dating approach to test hypotheses about die biogeography of Nothofagus. The molecular modelling suggests that the present-day subgenera and species date from a radiation that most likely commenced between 55 and 40 Myr ago. This rules out the possibility of a reconciled all-vicariance hypothesis for the biogeography of extant Nothofagus. However, the molecular dates for divergences between Australasian and South American taxa are consistent with the rifting of Australia and South America from Antarctica. The molecular dates further suggest a dispersal of subgenera Lophozonia and Fuscospora between Australia and New Zealand after the onset of the Antarctic Circumpolar Current and west wind drift. It appears likely that the New Caledonian lineage of subgenus Brassospora diverged from the New Guinean lineage elsewhere, prior to colonizing New Caledonia. The molecular approach strongly supports fossil-based estimates that Nothofagus diverged from the rest of Fagales more than 84 Myr ago. However, the mid-Cenozoic estimate for the diversification of the four extant subgenera conflicts with the palynological interpretation because pollen fossils, attributed to all four extant subgenera, were widespread across the Weddellian province of Gondwana about 71 Myr ago. The discrepancy between the pollen and molecular dates exists even when confidence intervals from several sources of error are taken into account. In contrast, the molecular age estimates are consistent with macrofossil dates. The incongruence between pollen fossils and molecular dates could be resolved if the early pollen types represent extinct lineages, with similar types later evolving independently in the extant lineages. |
format |
Article in Journal/Newspaper |
author |
Cook, Lynette Crisp, Michael |
author_facet |
Cook, Lynette Crisp, Michael |
author_sort |
Cook, Lynette |
title |
Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
title_short |
Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
title_full |
Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
title_fullStr |
Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
title_full_unstemmed |
Not so ancient: the extant crown group of Nothofagus represents a post-Gondwanan radiation |
title_sort |
not so ancient: the extant crown group of nothofagus represents a post-gondwanan radiation |
publisher |
Royal Society of London |
url |
http://hdl.handle.net/1885/79873 https://doi.org/10.1098/rspb.2005.3219 https://openresearch-repository.anu.edu.au/bitstream/1885/79873/5/MigratedxPub8238_2005.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/79873/7/01_Cook_Not_so_ancient%3A_the_extant_2005.pdf.jpg |
geographic |
Antarctic The Antarctic New Zealand |
geographic_facet |
Antarctic The Antarctic New Zealand |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Proceedings of the Royal Society of London Series B: Biological Sciences |
op_relation |
0962-8452 http://hdl.handle.net/1885/79873 doi:10.1098/rspb.2005.3219 https://openresearch-repository.anu.edu.au/bitstream/1885/79873/5/MigratedxPub8238_2005.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/79873/7/01_Cook_Not_so_ancient%3A_the_extant_2005.pdf.jpg |
op_doi |
https://doi.org/10.1098/rspb.2005.3219 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
272 |
container_issue |
1580 |
container_start_page |
2535 |
op_container_end_page |
2544 |
_version_ |
1788057338473611264 |