Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data
Abstract Speciation in the ocean could differ from terrestrial environments due to fewer barriers to gene flow. Hence, sympatric speciation might be common, with American and European eel being candidates for exemplifying this. They show disjunct continental distributions on both sides of the Atlant...
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crwiley:10.1111/mec.15342 2023-12-03T10:09:42+01:00 Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data Nikolic, Natacha Liu, Shenglin Jacobsen, Magnus W. Jónsson, Bjarni Bernatchez, Louis Gagnaire, Pierre‐Alexandre Hansen, Michael M. 2020 http://dx.doi.org/10.1111/mec.15342 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.15342 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.15342 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 29, issue 3, page 565-577 ISSN 0962-1083 1365-294X Genetics Ecology, Evolution, Behavior and Systematics journal-article 2020 crwiley https://doi.org/10.1111/mec.15342 2023-11-09T13:20:56Z Abstract Speciation in the ocean could differ from terrestrial environments due to fewer barriers to gene flow. Hence, sympatric speciation might be common, with American and European eel being candidates for exemplifying this. They show disjunct continental distributions on both sides of the Atlantic, but spawn in overlapping regions of the Sargasso Sea from where juveniles are advected to North American, European and North African coasts. Hybridization and introgression are known to occur, with hybrids almost exclusively observed in Iceland. Different speciation scenarios have been suggested, involving either vicariance or sympatric ecological speciation. Using RAD sequencing and whole‐genome sequencing data from parental species and F1 hybrids, we analysed speciation history based on the joint allele frequency spectrum (JAFS) and pairwise sequentially Markovian coalescent (PSMC) plots. JAFS supported a model involving a split without gene flow 150,000–160,000 generations ago, followed by secondary contact 87,000–92,000 generations ago, with 64% of the genome experiencing restricted gene flow. This supports vicariance rather than sympatric speciation, likely associated with Pleistocene glaciation cycles and ocean current changes. Whole‐genome PSMC analysis of F1 hybrids from Iceland suggested divergence 200,000 generations ago and indicated subsequent gene flow rather than strict isolation. Finally, simulations showed that results from both approaches (JAFS and PSMC) were congruent. Hence, there is strong evidence against sympatric speciation in North Atlantic eels. These results reiterate the need for careful consideration of cases of possible sympatric speciation, as even in seemingly barrier‐free oceanic environments palaeoceanographic factors may have promoted vicariance and allopatric speciation. Article in Journal/Newspaper Anguilla anguilla European eel Iceland North Atlantic Wiley Online Library (via Crossref) Molecular Ecology 29 3 565 577 |
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Wiley Online Library (via Crossref) |
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language |
English |
topic |
Genetics Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Genetics Ecology, Evolution, Behavior and Systematics Nikolic, Natacha Liu, Shenglin Jacobsen, Magnus W. Jónsson, Bjarni Bernatchez, Louis Gagnaire, Pierre‐Alexandre Hansen, Michael M. Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
topic_facet |
Genetics Ecology, Evolution, Behavior and Systematics |
description |
Abstract Speciation in the ocean could differ from terrestrial environments due to fewer barriers to gene flow. Hence, sympatric speciation might be common, with American and European eel being candidates for exemplifying this. They show disjunct continental distributions on both sides of the Atlantic, but spawn in overlapping regions of the Sargasso Sea from where juveniles are advected to North American, European and North African coasts. Hybridization and introgression are known to occur, with hybrids almost exclusively observed in Iceland. Different speciation scenarios have been suggested, involving either vicariance or sympatric ecological speciation. Using RAD sequencing and whole‐genome sequencing data from parental species and F1 hybrids, we analysed speciation history based on the joint allele frequency spectrum (JAFS) and pairwise sequentially Markovian coalescent (PSMC) plots. JAFS supported a model involving a split without gene flow 150,000–160,000 generations ago, followed by secondary contact 87,000–92,000 generations ago, with 64% of the genome experiencing restricted gene flow. This supports vicariance rather than sympatric speciation, likely associated with Pleistocene glaciation cycles and ocean current changes. Whole‐genome PSMC analysis of F1 hybrids from Iceland suggested divergence 200,000 generations ago and indicated subsequent gene flow rather than strict isolation. Finally, simulations showed that results from both approaches (JAFS and PSMC) were congruent. Hence, there is strong evidence against sympatric speciation in North Atlantic eels. These results reiterate the need for careful consideration of cases of possible sympatric speciation, as even in seemingly barrier‐free oceanic environments palaeoceanographic factors may have promoted vicariance and allopatric speciation. |
format |
Article in Journal/Newspaper |
author |
Nikolic, Natacha Liu, Shenglin Jacobsen, Magnus W. Jónsson, Bjarni Bernatchez, Louis Gagnaire, Pierre‐Alexandre Hansen, Michael M. |
author_facet |
Nikolic, Natacha Liu, Shenglin Jacobsen, Magnus W. Jónsson, Bjarni Bernatchez, Louis Gagnaire, Pierre‐Alexandre Hansen, Michael M. |
author_sort |
Nikolic, Natacha |
title |
Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
title_short |
Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
title_full |
Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
title_fullStr |
Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
title_full_unstemmed |
Speciation history of European ( Anguilla anguilla ) and American eel ( A. rostrata ), analysed using genomic data |
title_sort |
speciation history of european ( anguilla anguilla ) and american eel ( a. rostrata ), analysed using genomic data |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/mec.15342 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.15342 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.15342 |
genre |
Anguilla anguilla European eel Iceland North Atlantic |
genre_facet |
Anguilla anguilla European eel Iceland North Atlantic |
op_source |
Molecular Ecology volume 29, issue 3, page 565-577 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mec.15342 |
container_title |
Molecular Ecology |
container_volume |
29 |
container_issue |
3 |
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565 |
op_container_end_page |
577 |
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1784266912824295424 |