The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications
The extensive Late Cretaceous – Early Paleogene sedimentary succession of Seymour Island, N.E. Antarctic Peninsula offers an unparalleled opportunity to examine the evolutionary origins of a modern polar marine fauna. Some 38 modern Southern Ocean molluscan genera (26 gastropods and 12 bivalves), re...
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ftpubmed:oai:pubmedcentral.nih.gov:4262473 2023-05-15T13:44:24+02:00 The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications Crame, J. Alistair Beu, Alan G. Ineson, Jon R. Francis, Jane E. Whittle, Rowan J. Bowman, Vanessa C. 2014-12-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262473 http://www.ncbi.nlm.nih.gov/pubmed/25493546 https://doi.org/10.1371/journal.pone.0114743 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25493546 http://dx.doi.org/10.1371/journal.pone.0114743 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. CC-BY Research Article Text 2014 ftpubmed https://doi.org/10.1371/journal.pone.0114743 2014-12-21T01:01:16Z The extensive Late Cretaceous – Early Paleogene sedimentary succession of Seymour Island, N.E. Antarctic Peninsula offers an unparalleled opportunity to examine the evolutionary origins of a modern polar marine fauna. Some 38 modern Southern Ocean molluscan genera (26 gastropods and 12 bivalves), representing approximately 18% of the total modern benthic molluscan fauna, can now be traced back through at least part of this sequence. As noted elsewhere in the world, the balance of the molluscan fauna changes sharply across the Cretaceous – Paleogene (K/Pg) boundary, with gastropods subsequently becoming more diverse than bivalves. A major reason for this is a significant radiation of the Neogastropoda, which today forms one of the most diverse clades in the sea. Buccinoidea is the dominant neogastropod superfamily in both the Paleocene Sobral Formation (SF) (56% of neogastropod genera) and Early - Middle Eocene La Meseta Formation (LMF) (47%), with the Conoidea (25%) being prominent for the first time in the latter. This radiation of Neogastropoda is linked to a significant pulse of global warming that reached at least 65°S, and terminates abruptly in the upper LMF in an extinction event that most likely heralds the onset of global cooling. It is also possible that the marked Early Paleogene expansion of neogastropods in Antarctica is in part due to a global increase in rates of origination following the K/Pg mass extinction event. The radiation of this and other clades at ∼65°S indicates that Antarctica was not necessarily an evolutionary refugium, or sink, in the Early – Middle Eocene. Evolutionary source – sink dynamics may have been significantly different between the Paleogene greenhouse and Neogene icehouse worlds. Text Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Southern Ocean PubMed Central (PMC) Antarctic Antarctic Peninsula Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Sobral ENVELOPE(-40.650,-40.650,-81.083,-81.083) Southern Ocean The Antarctic PLoS ONE 9 12 e114743 |
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PubMed Central (PMC) |
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ftpubmed |
language |
English |
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Research Article |
spellingShingle |
Research Article Crame, J. Alistair Beu, Alan G. Ineson, Jon R. Francis, Jane E. Whittle, Rowan J. Bowman, Vanessa C. The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
topic_facet |
Research Article |
description |
The extensive Late Cretaceous – Early Paleogene sedimentary succession of Seymour Island, N.E. Antarctic Peninsula offers an unparalleled opportunity to examine the evolutionary origins of a modern polar marine fauna. Some 38 modern Southern Ocean molluscan genera (26 gastropods and 12 bivalves), representing approximately 18% of the total modern benthic molluscan fauna, can now be traced back through at least part of this sequence. As noted elsewhere in the world, the balance of the molluscan fauna changes sharply across the Cretaceous – Paleogene (K/Pg) boundary, with gastropods subsequently becoming more diverse than bivalves. A major reason for this is a significant radiation of the Neogastropoda, which today forms one of the most diverse clades in the sea. Buccinoidea is the dominant neogastropod superfamily in both the Paleocene Sobral Formation (SF) (56% of neogastropod genera) and Early - Middle Eocene La Meseta Formation (LMF) (47%), with the Conoidea (25%) being prominent for the first time in the latter. This radiation of Neogastropoda is linked to a significant pulse of global warming that reached at least 65°S, and terminates abruptly in the upper LMF in an extinction event that most likely heralds the onset of global cooling. It is also possible that the marked Early Paleogene expansion of neogastropods in Antarctica is in part due to a global increase in rates of origination following the K/Pg mass extinction event. The radiation of this and other clades at ∼65°S indicates that Antarctica was not necessarily an evolutionary refugium, or sink, in the Early – Middle Eocene. Evolutionary source – sink dynamics may have been significantly different between the Paleogene greenhouse and Neogene icehouse worlds. |
format |
Text |
author |
Crame, J. Alistair Beu, Alan G. Ineson, Jon R. Francis, Jane E. Whittle, Rowan J. Bowman, Vanessa C. |
author_facet |
Crame, J. Alistair Beu, Alan G. Ineson, Jon R. Francis, Jane E. Whittle, Rowan J. Bowman, Vanessa C. |
author_sort |
Crame, J. Alistair |
title |
The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
title_short |
The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
title_full |
The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
title_fullStr |
The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
title_full_unstemmed |
The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |
title_sort |
early origin of the antarctic marine fauna and its evolutionary implications |
publisher |
Public Library of Science |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262473 http://www.ncbi.nlm.nih.gov/pubmed/25493546 https://doi.org/10.1371/journal.pone.0114743 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-40.650,-40.650,-81.083,-81.083) |
geographic |
Antarctic Antarctic Peninsula Seymour Seymour Island Sobral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Seymour Seymour Island Sobral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25493546 http://dx.doi.org/10.1371/journal.pone.0114743 |
op_rights |
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. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0114743 |
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PLoS ONE |
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9 |
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12 |
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e114743 |
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