Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish
International audience Assessing genetic connectivity among populations in high gene flow species is sometimes insufficient to evaluate demographic connectivity. Genetic differentiation quickly becomes zero as soon as a few dozen migrants are exchanged per generation. This provides little informatio...
Published in: | Molecular Ecology |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-02925509 https://hal.science/hal-02925509/document https://hal.science/hal-02925509/file/Robinet_etal_MEC_text_REVISED_FINAL.pdf https://doi.org/10.1111/mec.15611 |
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ftnormandieuniv:oai:HAL:hal-02925509v1 |
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Open Polar |
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Normandie Université: HAL |
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ftnormandieuniv |
language |
English |
topic |
[SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
[SDV.EE]Life Sciences [q-bio]/Ecology environment Robinet, Tony Roussel, Valérie Cheze, Karine Gagnaire, Pierre-Alexandre Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
topic_facet |
[SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
International audience Assessing genetic connectivity among populations in high gene flow species is sometimes insufficient to evaluate demographic connectivity. Genetic differentiation quickly becomes zero as soon as a few dozen migrants are exchanged per generation. This provides little information to determine whether migration can ensure demographic coupling. The resulting difficulties in delineating conservation units for the management of commercially exploited marine fish species are well illustrated in the case of the European sea bass (Dicentrarchus labrax). Previous attempts to assess connectivity patterns in the northeast Atlantic have been hampered by a lack of spatial genetic structure. In contrast, mark-recapture data suggested low migration rates between regional spawning areas. Here, we show how a spatial gradient of introgressed Mediterranean ancestry across the northeast Atlantic reflects cryptic patterns of genetic and demographic connectivity. Using a 1K SNP chip dataset in 827 individuals sampled from Portugal to the North Sea, we found null overall genetic differentiation across the northeast Atlantic. We however detected a subtle latitudinal admixture gradient originating at the edge of the contact zone with the Mediterranean sea bass lineage. Two significant breaks in the ancestry gradient at the tip of Galicia and northern Brittany indicated barriers to effective dispersal between demographically distinct units. Moreover, a northward expansion signal in Irish and North Seas was revealed by the surfing of rare Mediterranean alleles at the edge of the species range. Our results show that introgressed ancestry gradients offer a powerful alternative to assess genetic and demographic connectivity when the neutral migration-drift balance is not informative. |
author2 |
Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Station de Biologie Marine de Concarneau Direction générale déléguée à la Recherche, à l’Expertise, à la Valorisation et à l’Enseignement-Formation (DGD.REVE) Muséum national d'Histoire naturelle (MNHN)-Muséum national d'Histoire naturelle (MNHN) Institut de Géoarchitecture Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois des Sciences de l'Homme et de la Société (IBSHS) Université de Brest (UBO)-Université de Brest (UBO) Institut des Sciences de l'Evolution de Montpellier (UMR ISEM) Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement IRD : UR226-Centre National de la Recherche Scientifique (CNRS) FFP: France Filière PêcheMNHN: Muséum National d'Histoire Naturelle |
format |
Article in Journal/Newspaper |
author |
Robinet, Tony Roussel, Valérie Cheze, Karine Gagnaire, Pierre-Alexandre |
author_facet |
Robinet, Tony Roussel, Valérie Cheze, Karine Gagnaire, Pierre-Alexandre |
author_sort |
Robinet, Tony |
title |
Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
title_short |
Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
title_full |
Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
title_fullStr |
Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
title_full_unstemmed |
Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
title_sort |
spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02925509 https://hal.science/hal-02925509/document https://hal.science/hal-02925509/file/Robinet_etal_MEC_text_REVISED_FINAL.pdf https://doi.org/10.1111/mec.15611 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
ISSN: 0962-1083 EISSN: 1365-294X Molecular Ecology https://hal.science/hal-02925509 Molecular Ecology, 2020, ⟨10.1111/mec.15611⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/mec.15611 hal-02925509 https://hal.science/hal-02925509 https://hal.science/hal-02925509/document https://hal.science/hal-02925509/file/Robinet_etal_MEC_text_REVISED_FINAL.pdf doi:10.1111/mec.15611 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/mec.15611 |
container_title |
Molecular Ecology |
container_volume |
29 |
container_issue |
20 |
container_start_page |
3857 |
op_container_end_page |
3871 |
_version_ |
1799485876915404800 |
spelling |
ftnormandieuniv:oai:HAL:hal-02925509v1 2024-05-19T07:45:46+00:00 Spatial gradients of introgressed ancestry reveal cryptic connectivity patterns in a high gene flow marine fish Robinet, Tony Roussel, Valérie Cheze, Karine Gagnaire, Pierre-Alexandre Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Station de Biologie Marine de Concarneau Direction générale déléguée à la Recherche, à l’Expertise, à la Valorisation et à l’Enseignement-Formation (DGD.REVE) Muséum national d'Histoire naturelle (MNHN)-Muséum national d'Histoire naturelle (MNHN) Institut de Géoarchitecture Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Brestois des Sciences de l'Homme et de la Société (IBSHS) Université de Brest (UBO)-Université de Brest (UBO) Institut des Sciences de l'Evolution de Montpellier (UMR ISEM) Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement IRD : UR226-Centre National de la Recherche Scientifique (CNRS) FFP: France Filière PêcheMNHN: Muséum National d'Histoire Naturelle 2020-08-27 https://hal.science/hal-02925509 https://hal.science/hal-02925509/document https://hal.science/hal-02925509/file/Robinet_etal_MEC_text_REVISED_FINAL.pdf https://doi.org/10.1111/mec.15611 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/mec.15611 hal-02925509 https://hal.science/hal-02925509 https://hal.science/hal-02925509/document https://hal.science/hal-02925509/file/Robinet_etal_MEC_text_REVISED_FINAL.pdf doi:10.1111/mec.15611 info:eu-repo/semantics/OpenAccess ISSN: 0962-1083 EISSN: 1365-294X Molecular Ecology https://hal.science/hal-02925509 Molecular Ecology, 2020, ⟨10.1111/mec.15611⟩ [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/article Journal articles 2020 ftnormandieuniv https://doi.org/10.1111/mec.15611 2024-05-01T23:55:53Z International audience Assessing genetic connectivity among populations in high gene flow species is sometimes insufficient to evaluate demographic connectivity. Genetic differentiation quickly becomes zero as soon as a few dozen migrants are exchanged per generation. This provides little information to determine whether migration can ensure demographic coupling. The resulting difficulties in delineating conservation units for the management of commercially exploited marine fish species are well illustrated in the case of the European sea bass (Dicentrarchus labrax). Previous attempts to assess connectivity patterns in the northeast Atlantic have been hampered by a lack of spatial genetic structure. In contrast, mark-recapture data suggested low migration rates between regional spawning areas. Here, we show how a spatial gradient of introgressed Mediterranean ancestry across the northeast Atlantic reflects cryptic patterns of genetic and demographic connectivity. Using a 1K SNP chip dataset in 827 individuals sampled from Portugal to the North Sea, we found null overall genetic differentiation across the northeast Atlantic. We however detected a subtle latitudinal admixture gradient originating at the edge of the contact zone with the Mediterranean sea bass lineage. Two significant breaks in the ancestry gradient at the tip of Galicia and northern Brittany indicated barriers to effective dispersal between demographically distinct units. Moreover, a northward expansion signal in Irish and North Seas was revealed by the surfing of rare Mediterranean alleles at the edge of the species range. Our results show that introgressed ancestry gradients offer a powerful alternative to assess genetic and demographic connectivity when the neutral migration-drift balance is not informative. Article in Journal/Newspaper Northeast Atlantic Normandie Université: HAL Molecular Ecology 29 20 3857 3871 |