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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.291.7023 2023-05-15T14:04:11+02:00 On the Origin and Trigger of the Notothenioid Adaptive Radiation Michael Matschiner Reinhold Hanel Walter Salzburger The Pennsylvania State University CiteSeerX Archives 2011 application/zip http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.291.7023 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.291.7023 Metadata may be used without restrictions as long as the oai identifier remains attached to it. ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/dc/37/PLoS_One_2011_Apr_18_6(4)_e18911.tar.gz text 2011 ftciteseerx 2016-01-07T21:35:53Z 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 timeconstraints 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 Text Antarc* Antarctic Antarctica Sea ice Unknown Antarctic |
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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 timeconstraints 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 |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael Matschiner Reinhold Hanel Walter Salzburger |
spellingShingle |
Michael Matschiner Reinhold Hanel Walter Salzburger On the Origin and Trigger of the Notothenioid Adaptive Radiation |
author_facet |
Michael Matschiner Reinhold Hanel Walter Salzburger |
author_sort |
Michael Matschiner |
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 |
publishDate |
2011 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.291.7023 |
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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 |
op_source |
ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/dc/37/PLoS_One_2011_Apr_18_6(4)_e18911.tar.gz |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.291.7023 |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766275192129060864 |