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 interspecific 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,...
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Online Access: | http://hdl.handle.net/11577/2695096 https://doi.org/10.1111/mec.12458 |
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ftunivpadovairis:oai:www.research.unipd.it:11577/2695096 2024-02-11T09:58:16+01:00 Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation MARINO, ILARIA ANNA MARIA AGOSTINI, CECILIA PATARNELLO, TOMASO ZANE, LORENZO A. Benazzo M. Mezzavilla S. M. Hoban G. Bertorelle Marino, ILARIA ANNA MARIA A., Benazzo Agostini, Cecilia M., Mezzavilla S. M., Hoban Patarnello, Tomaso Zane, Lorenzo G., Bertorelle 2013 STAMPA http://hdl.handle.net/11577/2695096 https://doi.org/10.1111/mec.12458 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000325550000008 volume:22 issue:20 firstpage:5148 lastpage:5161 numberofpages:14 journal:MOLECULAR ECOLOGY http://hdl.handle.net/11577/2695096 doi:10.1111/mec.12458 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84885600539 Approximate Bayesian Computation Chionodraco hybridization interglacial microsatellite structure info:eu-repo/semantics/article 2013 ftunivpadovairis https://doi.org/10.1111/mec.12458 2024-01-24T17:39:52Z Determining the timing, extent and underlying causes of interspecific 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 Padua Research Archive (IRIS - Università degli Studi di Padova) Antarctic Molecular Ecology 22 20 5148 5161 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
Approximate Bayesian Computation Chionodraco hybridization interglacial microsatellite structure |
spellingShingle |
Approximate Bayesian Computation Chionodraco hybridization interglacial microsatellite structure MARINO, ILARIA ANNA MARIA AGOSTINI, CECILIA PATARNELLO, TOMASO ZANE, LORENZO A. Benazzo M. Mezzavilla S. M. Hoban G. Bertorelle Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
topic_facet |
Approximate Bayesian Computation Chionodraco hybridization interglacial microsatellite structure |
description |
Determining the timing, extent and underlying causes of interspecific 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. |
author2 |
Marino, ILARIA ANNA MARIA A., Benazzo Agostini, Cecilia M., Mezzavilla S. M., Hoban Patarnello, Tomaso Zane, Lorenzo G., Bertorelle |
format |
Article in Journal/Newspaper |
author |
MARINO, ILARIA ANNA MARIA AGOSTINI, CECILIA PATARNELLO, TOMASO ZANE, LORENZO A. Benazzo M. Mezzavilla S. M. Hoban G. Bertorelle |
author_facet |
MARINO, ILARIA ANNA MARIA AGOSTINI, CECILIA PATARNELLO, TOMASO ZANE, LORENZO A. Benazzo M. Mezzavilla S. M. Hoban G. Bertorelle |
author_sort |
MARINO, ILARIA ANNA MARIA |
title |
Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_short |
Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_full |
Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_fullStr |
Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_full_unstemmed |
Evidence for past and present hybridization in three Antarctic icefish species provides new perspectives on an evolutionary radiation |
title_sort |
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/11577/2695096 https://doi.org/10.1111/mec.12458 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Icefish |
genre_facet |
Antarc* Antarctic Icefish |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000325550000008 volume:22 issue:20 firstpage:5148 lastpage:5161 numberofpages:14 journal:MOLECULAR ECOLOGY http://hdl.handle.net/11577/2695096 doi:10.1111/mec.12458 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84885600539 |
op_doi |
https://doi.org/10.1111/mec.12458 |
container_title |
Molecular Ecology |
container_volume |
22 |
container_issue |
20 |
container_start_page |
5148 |
op_container_end_page |
5161 |
_version_ |
1790593878976364544 |