Introgressive hybridization and latitudinal admixture clines in North Atlantic eels
Background Hybridization, the interbreeding of diagnosably divergent species, is a major focus in evolutionary studies. Eels, both from North America and Europe migrate through the Atlantic to mate in a vast, overlapping area in the Sargasso Sea. Due to the lack of direct observation, it is unknown...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/83693 2023-06-11T04:03:43+02:00 Introgressive hybridization and latitudinal admixture clines in North Atlantic eels Wielgoss, Sébastien Gilabert, Aude Meyer, Axel Wirth, Thierry 2014-03 application/application/pdf https://hdl.handle.net/20.500.11850/83693 https://doi.org/10.3929/ethz-b-000083693 en eng BioMed Central info:eu-repo/semantics/altIdentifier/doi/10.1186/1471-2148-14-61 info:eu-repo/semantics/altIdentifier/wos/000334466600001 info:eu-repo/grantAgreement/EC/FP7/331824 http://hdl.handle.net/20.500.11850/83693 doi:10.3929/ethz-b-000083693 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.0/ Creative Commons Attribution 2.0 Generic BMC Evolutionary Biology, 14 Anguilla anguilla Anguilla rostrata Gene flow Isolation-by-distance Simulation Migration barriers info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftethz https://doi.org/20.500.11850/8369310.3929/ethz-b-00008369310.1186/1471-2148-14-61 2023-05-28T23:46:02Z Background Hybridization, the interbreeding of diagnosably divergent species, is a major focus in evolutionary studies. Eels, both from North America and Europe migrate through the Atlantic to mate in a vast, overlapping area in the Sargasso Sea. Due to the lack of direct observation, it is unknown how these species remain reproductively isolated. The detection of inter-species hybrids in Iceland suggests on-going gene flow, but few studies to date have addressed the influence of introgression on genetic differentiation in North Atlantic eels. Results Here, we show that while mitochondrial lineages remain completely distinct on both sides of the Atlantic, limited hybridization is detectable with nuclear DNA markers. The nuclear hybridization signal peaks in the northern areas and decreases towards the southern range limits on both continents according to Bayesian assignment analyses. By simulating increasing proportions of both F1 hybrids and admixed individuals from the southern to the northern-most locations, we were able to generate highly significant isolation-by-distance patterns in both cases, reminiscent of previously published data for the European eel. Finally, fitting an isolation-with-migration model to our data supports the hypothesis of recent asymmetric introgression and refutes the alternative hypothesis of ancient polymorphism. Conclusions Fluctuating degrees of introgressive hybridization between Atlantic eel species are sufficient to explain temporally varying correlations of geographic and genetic distances reported for populations of the European eel. ISSN:1471-2148 Article in Journal/Newspaper Anguilla anguilla European eel Iceland North Atlantic ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Anguilla anguilla Anguilla rostrata Gene flow Isolation-by-distance Simulation Migration barriers |
spellingShingle |
Anguilla anguilla Anguilla rostrata Gene flow Isolation-by-distance Simulation Migration barriers Wielgoss, Sébastien Gilabert, Aude Meyer, Axel Wirth, Thierry Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
topic_facet |
Anguilla anguilla Anguilla rostrata Gene flow Isolation-by-distance Simulation Migration barriers |
description |
Background Hybridization, the interbreeding of diagnosably divergent species, is a major focus in evolutionary studies. Eels, both from North America and Europe migrate through the Atlantic to mate in a vast, overlapping area in the Sargasso Sea. Due to the lack of direct observation, it is unknown how these species remain reproductively isolated. The detection of inter-species hybrids in Iceland suggests on-going gene flow, but few studies to date have addressed the influence of introgression on genetic differentiation in North Atlantic eels. Results Here, we show that while mitochondrial lineages remain completely distinct on both sides of the Atlantic, limited hybridization is detectable with nuclear DNA markers. The nuclear hybridization signal peaks in the northern areas and decreases towards the southern range limits on both continents according to Bayesian assignment analyses. By simulating increasing proportions of both F1 hybrids and admixed individuals from the southern to the northern-most locations, we were able to generate highly significant isolation-by-distance patterns in both cases, reminiscent of previously published data for the European eel. Finally, fitting an isolation-with-migration model to our data supports the hypothesis of recent asymmetric introgression and refutes the alternative hypothesis of ancient polymorphism. Conclusions Fluctuating degrees of introgressive hybridization between Atlantic eel species are sufficient to explain temporally varying correlations of geographic and genetic distances reported for populations of the European eel. ISSN:1471-2148 |
format |
Article in Journal/Newspaper |
author |
Wielgoss, Sébastien Gilabert, Aude Meyer, Axel Wirth, Thierry |
author_facet |
Wielgoss, Sébastien Gilabert, Aude Meyer, Axel Wirth, Thierry |
author_sort |
Wielgoss, Sébastien |
title |
Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
title_short |
Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
title_full |
Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
title_fullStr |
Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
title_full_unstemmed |
Introgressive hybridization and latitudinal admixture clines in North Atlantic eels |
title_sort |
introgressive hybridization and latitudinal admixture clines in north atlantic eels |
publisher |
BioMed Central |
publishDate |
2014 |
url |
https://hdl.handle.net/20.500.11850/83693 https://doi.org/10.3929/ethz-b-000083693 |
genre |
Anguilla anguilla European eel Iceland North Atlantic |
genre_facet |
Anguilla anguilla European eel Iceland North Atlantic |
op_source |
BMC Evolutionary Biology, 14 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1186/1471-2148-14-61 info:eu-repo/semantics/altIdentifier/wos/000334466600001 info:eu-repo/grantAgreement/EC/FP7/331824 http://hdl.handle.net/20.500.11850/83693 doi:10.3929/ethz-b-000083693 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.0/ Creative Commons Attribution 2.0 Generic |
op_doi |
https://doi.org/20.500.11850/8369310.3929/ethz-b-00008369310.1186/1471-2148-14-61 |
_version_ |
1768382369030471680 |