A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea
Abstract The impact of post‐divergence gene flow in speciation has been documented across a range of taxa in recent years, and may have been especially widespread in highly mobile, wide‐ranging marine species, such as cetaceans. Here, we studied individual genomes from nine species across the three...
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Online Access: | http://dx.doi.org/10.1111/mec.17069 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.17069 |
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crwiley:10.1111/mec.17069 2024-05-19T07:49:28+00:00 A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea Westbury, Michael V. Cabrera, Andrea A. Rey‐Iglesia, Alba De Cahsan, Binia Duchêne, David A. Hartmann, Stefanie Lorenzen, Eline D. Villum Fonden 2023 http://dx.doi.org/10.1111/mec.17069 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.17069 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Molecular Ecology volume 32, issue 17, page 4829-4843 ISSN 0962-1083 1365-294X journal-article 2023 crwiley https://doi.org/10.1111/mec.17069 2024-04-25T08:27:02Z Abstract The impact of post‐divergence gene flow in speciation has been documented across a range of taxa in recent years, and may have been especially widespread in highly mobile, wide‐ranging marine species, such as cetaceans. Here, we studied individual genomes from nine species across the three families of the toothed whale superfamily Delphinoidea (Delphinidae, Phocoenidae and Monodontidae). To investigate the role of post‐divergence gene flow in the speciation process, we used a multifaceted approach, including (i) phylogenomics, (ii) the distribution of shared derived alleles and (iii) demographic inference. We found the divergence of lineages within Delphinoidea did not follow a process of pure bifurcation, but was much more complex. Sliding‐window phylogenomics reveal a high prevalence of discordant topologies within the superfamily, with further analyses indicating these discordances arose due to both incomplete lineage sorting and gene flow. D‐statistics and f ‐branch analyses supported gene flow between members of Delphinoidea, with the vast majority of gene flow occurring as ancient interfamilial events. Demographic analyses provided evidence that introgressive gene flow has likely ceased between all species pairs tested, despite reports of contemporary interspecific hybrids. Our study provides the first steps towards resolving the large complexity of speciation within Delphinoidea; we reveal the prevalence of ancient interfamilial gene flow events prior to the diversification of each family, and suggest that contemporary hybridisation events may be disadvantageous, as hybrid individuals do not appear to contribute to the parental species' gene pools. Article in Journal/Newspaper toothed whale Wiley Online Library Molecular Ecology 32 17 4829 4843 |
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Abstract The impact of post‐divergence gene flow in speciation has been documented across a range of taxa in recent years, and may have been especially widespread in highly mobile, wide‐ranging marine species, such as cetaceans. Here, we studied individual genomes from nine species across the three families of the toothed whale superfamily Delphinoidea (Delphinidae, Phocoenidae and Monodontidae). To investigate the role of post‐divergence gene flow in the speciation process, we used a multifaceted approach, including (i) phylogenomics, (ii) the distribution of shared derived alleles and (iii) demographic inference. We found the divergence of lineages within Delphinoidea did not follow a process of pure bifurcation, but was much more complex. Sliding‐window phylogenomics reveal a high prevalence of discordant topologies within the superfamily, with further analyses indicating these discordances arose due to both incomplete lineage sorting and gene flow. D‐statistics and f ‐branch analyses supported gene flow between members of Delphinoidea, with the vast majority of gene flow occurring as ancient interfamilial events. Demographic analyses provided evidence that introgressive gene flow has likely ceased between all species pairs tested, despite reports of contemporary interspecific hybrids. Our study provides the first steps towards resolving the large complexity of speciation within Delphinoidea; we reveal the prevalence of ancient interfamilial gene flow events prior to the diversification of each family, and suggest that contemporary hybridisation events may be disadvantageous, as hybrid individuals do not appear to contribute to the parental species' gene pools. |
author2 |
Villum Fonden |
format |
Article in Journal/Newspaper |
author |
Westbury, Michael V. Cabrera, Andrea A. Rey‐Iglesia, Alba De Cahsan, Binia Duchêne, David A. Hartmann, Stefanie Lorenzen, Eline D. |
spellingShingle |
Westbury, Michael V. Cabrera, Andrea A. Rey‐Iglesia, Alba De Cahsan, Binia Duchêne, David A. Hartmann, Stefanie Lorenzen, Eline D. A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
author_facet |
Westbury, Michael V. Cabrera, Andrea A. Rey‐Iglesia, Alba De Cahsan, Binia Duchêne, David A. Hartmann, Stefanie Lorenzen, Eline D. |
author_sort |
Westbury, Michael V. |
title |
A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
title_short |
A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
title_full |
A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
title_fullStr |
A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
title_full_unstemmed |
A genomic assessment of the marine‐speciation paradox within the toothed whale superfamily Delphinoidea |
title_sort |
genomic assessment of the marine‐speciation paradox within the toothed whale superfamily delphinoidea |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/mec.17069 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.17069 |
genre |
toothed whale |
genre_facet |
toothed whale |
op_source |
Molecular Ecology volume 32, issue 17, page 4829-4843 ISSN 0962-1083 1365-294X |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1111/mec.17069 |
container_title |
Molecular Ecology |
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32 |
container_issue |
17 |
container_start_page |
4829 |
op_container_end_page |
4843 |
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1799467965975887872 |