On the Origin and Trigger of the Notothenioid Adaptive Radiation
Adaptive radiation is usually triggered by ecological opportunity, arising through (i) the colonization of a new habitat by its progenitor; (ii) the extinction of competitors; or (iii) the emergence of an evolutionary key innovation in the ancestral lineage. Support for the key innovation hypothesis...
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ftpubmed:oai:pubmedcentral.nih.gov:3078932 2023-05-15T14:06:27+02:00 On the Origin and Trigger of the Notothenioid Adaptive Radiation Matschiner, Michael Hanel, Reinhold Salzburger, Walter 2011-04-18 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078932 http://www.ncbi.nlm.nih.gov/pubmed/21533117 https://doi.org/10.1371/journal.pone.0018911 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078932 http://www.ncbi.nlm.nih.gov/pubmed/21533117 http://dx.doi.org/10.1371/journal.pone.0018911 Matschiner et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2011 ftpubmed https://doi.org/10.1371/journal.pone.0018911 2013-09-03T13:35:49Z Adaptive radiation is usually triggered by ecological opportunity, arising through (i) the colonization of a new habitat by its progenitor; (ii) the extinction of competitors; or (iii) the emergence of an evolutionary key innovation in the ancestral lineage. Support for the key innovation hypothesis is scarce, however, even in textbook examples of adaptive radiation. Antifreeze glycoproteins (AFGPs) have been proposed as putative key innovation for the adaptive radiation of notothenioid fishes in the ice-cold waters of Antarctica. A crucial prerequisite for this assumption is the concurrence of the notothenioid radiation with the onset of Antarctic sea ice conditions. Here, we use a fossil-calibrated multi-marker phylogeny of nothothenioid and related acanthomorph fishes to date AFGP emergence and the notothenioid radiation. All time-constraints are cross-validated to assess their reliability resulting in six powerful calibration points. We find that the notothenioid radiation began near the Oligocene-Miocene transition, which coincides with the increasing presence of Antarctic sea ice. Divergence dates of notothenioids are thus consistent with the key innovation hypothesis of AFGP. Early notothenioid divergences are furthermore congruent with vicariant speciation and the breakup of Gondwana. Text Antarc* Antarctic Antarctica Sea ice PubMed Central (PMC) Antarctic PLoS ONE 6 4 e18911 |
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Research Article Matschiner, Michael Hanel, Reinhold Salzburger, Walter On the Origin and Trigger of the Notothenioid Adaptive Radiation |
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Adaptive radiation is usually triggered by ecological opportunity, arising through (i) the colonization of a new habitat by its progenitor; (ii) the extinction of competitors; or (iii) the emergence of an evolutionary key innovation in the ancestral lineage. Support for the key innovation hypothesis is scarce, however, even in textbook examples of adaptive radiation. Antifreeze glycoproteins (AFGPs) have been proposed as putative key innovation for the adaptive radiation of notothenioid fishes in the ice-cold waters of Antarctica. A crucial prerequisite for this assumption is the concurrence of the notothenioid radiation with the onset of Antarctic sea ice conditions. Here, we use a fossil-calibrated multi-marker phylogeny of nothothenioid and related acanthomorph fishes to date AFGP emergence and the notothenioid radiation. All time-constraints are cross-validated to assess their reliability resulting in six powerful calibration points. We find that the notothenioid radiation began near the Oligocene-Miocene transition, which coincides with the increasing presence of Antarctic sea ice. Divergence dates of notothenioids are thus consistent with the key innovation hypothesis of AFGP. Early notothenioid divergences are furthermore congruent with vicariant speciation and the breakup of Gondwana. |
format |
Text |
author |
Matschiner, Michael Hanel, Reinhold Salzburger, Walter |
author_facet |
Matschiner, Michael Hanel, Reinhold Salzburger, Walter |
author_sort |
Matschiner, Michael |
title |
On the Origin and Trigger of the Notothenioid Adaptive Radiation |
title_short |
On the Origin and Trigger of the Notothenioid Adaptive Radiation |
title_full |
On the Origin and Trigger of the Notothenioid Adaptive Radiation |
title_fullStr |
On the Origin and Trigger of the Notothenioid Adaptive Radiation |
title_full_unstemmed |
On the Origin and Trigger of the Notothenioid Adaptive Radiation |
title_sort |
on the origin and trigger of the notothenioid adaptive radiation |
publisher |
Public Library of Science |
publishDate |
2011 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078932 http://www.ncbi.nlm.nih.gov/pubmed/21533117 https://doi.org/10.1371/journal.pone.0018911 |
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Antarctic |
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Antarctic |
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Antarc* Antarctic Antarctica Sea ice |
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Antarc* Antarctic Antarctica Sea ice |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078932 http://www.ncbi.nlm.nih.gov/pubmed/21533117 http://dx.doi.org/10.1371/journal.pone.0018911 |
op_rights |
Matschiner et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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CC-BY |
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https://doi.org/10.1371/journal.pone.0018911 |
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PLoS ONE |
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6 |
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e18911 |
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