Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation
Determining the timing, extent, and underlying causes of inter-specific gene exchange during or following speciation is central to understanding species’ evolution. Antarctic notothenioid fish, thanks to the acquisition of antifreeze glycoproteins during Oligocene transition to polar conditions, exp...
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ftdryad:oai:v1.datadryad.org:10255/dryad.51085 2023-05-15T13:38:10+02:00 Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation Marino, Ilaria A. M. Benazzo, Andrea Agostini, Cecilia Mezzavilla, Massimo Hoban, Sean M. Patarnello, Tomaso Zane, Lorenzo Bertorelle, Giorgio Southern Ocean Antarctic waters Holocene Pleistocene 2013-07-19T16:51:31Z http://hdl.handle.net/10255/dryad.51085 https://doi.org/10.5061/dryad.n8n6k unknown doi:10.5061/dryad.n8n6k/1 doi:10.1111/mec.12458 PMID:23962255 doi:10.5061/dryad.n8n6k Marino IAM, Benazzo A, Agostini C, Mezzavilla M, Hoban SM, Patarnello T, Zane L, Bertorelle G (2013) Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation. Molecular Ecology 22(20): 5148-5161. http://hdl.handle.net/10255/dryad.51085 Hybridization Population Genetics - Empirical Speciation Fish Structure Approximate Bayesian Computation Article 2013 ftdryad https://doi.org/10.5061/dryad.n8n6k https://doi.org/10.5061/dryad.n8n6k/1 https://doi.org/10.1111/mec.12458 2020-01-01T15:02:21Z Determining the timing, extent, and underlying causes of inter-specific gene exchange during or following speciation is central to understanding species’ evolution. Antarctic notothenioid fish, thanks to the acquisition of antifreeze glycoproteins during Oligocene transition to polar conditions, experienced a spectacular radiation to >100 species during Late Miocene cooling events. The impact of recent glacial cycles on this group is poorly known, but alternating warming and cooling periods may have affected species’ distributions, promoted ecological divergence into recurrently opening niches, and/or possibly brought allopatric species into contact. Using microsatellite markers and statistical methods including Approximate Bayesian Computation, we investigated genetic differentiation, hybridization and the possible influence of the last glaciation/deglaciation events in three icefish species of the genus Chionodraco. Our results provide strong evidence of contemporary and past introgression by showing that: i) a substantial fraction of contemporary individuals in each species has mixed ancestry; ii) evolutionary scenarios excluding hybridization or including it only in ancient times have small or zero posterior probabilities; iii) the data support a scenario of interspecific gene flow associated with the two most recent interglacial periods. Glacial cycles might therefore have had a profound impact on the genetic composition of Antarctic fauna, as newly available shelf areas during the warmer intervals might have favoured secondary contacts and hybridization between diversified groups. If our findings are confirmed in other notothenioids, they offer new perspectives for understanding evolutionary dynamics of Antarctic fish, and suggest a need for new predictions on the effects of global warming in this group. Article in Journal/Newspaper Antarc* Antarctic Icefish Southern Ocean Dryad Digital Repository (Duke University) Antarctic Southern Ocean |
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Open Polar |
collection |
Dryad Digital Repository (Duke University) |
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ftdryad |
language |
unknown |
topic |
Hybridization Population Genetics - Empirical Speciation Fish Structure Approximate Bayesian Computation |
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Hybridization Population Genetics - Empirical Speciation Fish Structure Approximate Bayesian Computation Marino, Ilaria A. M. Benazzo, Andrea Agostini, Cecilia Mezzavilla, Massimo Hoban, Sean M. Patarnello, Tomaso Zane, Lorenzo Bertorelle, Giorgio Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
topic_facet |
Hybridization Population Genetics - Empirical Speciation Fish Structure Approximate Bayesian Computation |
description |
Determining the timing, extent, and underlying causes of inter-specific gene exchange during or following speciation is central to understanding species’ evolution. Antarctic notothenioid fish, thanks to the acquisition of antifreeze glycoproteins during Oligocene transition to polar conditions, experienced a spectacular radiation to >100 species during Late Miocene cooling events. The impact of recent glacial cycles on this group is poorly known, but alternating warming and cooling periods may have affected species’ distributions, promoted ecological divergence into recurrently opening niches, and/or possibly brought allopatric species into contact. Using microsatellite markers and statistical methods including Approximate Bayesian Computation, we investigated genetic differentiation, hybridization and the possible influence of the last glaciation/deglaciation events in three icefish species of the genus Chionodraco. Our results provide strong evidence of contemporary and past introgression by showing that: i) a substantial fraction of contemporary individuals in each species has mixed ancestry; ii) evolutionary scenarios excluding hybridization or including it only in ancient times have small or zero posterior probabilities; iii) the data support a scenario of interspecific gene flow associated with the two most recent interglacial periods. Glacial cycles might therefore have had a profound impact on the genetic composition of Antarctic fauna, as newly available shelf areas during the warmer intervals might have favoured secondary contacts and hybridization between diversified groups. If our findings are confirmed in other notothenioids, they offer new perspectives for understanding evolutionary dynamics of Antarctic fish, and suggest a need for new predictions on the effects of global warming in this group. |
format |
Article in Journal/Newspaper |
author |
Marino, Ilaria A. M. Benazzo, Andrea Agostini, Cecilia Mezzavilla, Massimo Hoban, Sean M. Patarnello, Tomaso Zane, Lorenzo Bertorelle, Giorgio |
author_facet |
Marino, Ilaria A. M. Benazzo, Andrea Agostini, Cecilia Mezzavilla, Massimo Hoban, Sean M. Patarnello, Tomaso Zane, Lorenzo Bertorelle, Giorgio |
author_sort |
Marino, Ilaria A. M. |
title |
Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_short |
Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_full |
Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_fullStr |
Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_full_unstemmed |
Data from: Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_sort |
data from: evidence for past and present hybridization in three antarctic icefish species provides new perspectives on an evolutionary radiation |
publishDate |
2013 |
url |
http://hdl.handle.net/10255/dryad.51085 https://doi.org/10.5061/dryad.n8n6k |
op_coverage |
Southern Ocean Antarctic waters Holocene Pleistocene |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Icefish Southern Ocean |
genre_facet |
Antarc* Antarctic Icefish Southern Ocean |
op_relation |
doi:10.5061/dryad.n8n6k/1 doi:10.1111/mec.12458 PMID:23962255 doi:10.5061/dryad.n8n6k Marino IAM, Benazzo A, Agostini C, Mezzavilla M, Hoban SM, Patarnello T, Zane L, Bertorelle G (2013) Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation. Molecular Ecology 22(20): 5148-5161. http://hdl.handle.net/10255/dryad.51085 |
op_doi |
https://doi.org/10.5061/dryad.n8n6k https://doi.org/10.5061/dryad.n8n6k/1 https://doi.org/10.1111/mec.12458 |
_version_ |
1766102180164534272 |