Disentangling structural genomic and behavioural barriers in a sea of connectivity
Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversio...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518941/ http://www.ncbi.nlm.nih.gov/pubmed/30633410 https://doi.org/10.1111/mec.15010 |
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ftpubmed:oai:pubmedcentral.nih.gov:6518941 2023-05-15T15:27:07+02:00 Disentangling structural genomic and behavioural barriers in a sea of connectivity Barth, Julia M. I. Villegas‐Ríos, David Freitas, Carla Moland, Even Star, Bastiaan André, Carl Knutsen, Halvor Bradbury, Ian Dierking, Jan Petereit, Christoph Righton, David Metcalfe, Julian Jakobsen, Kjetill S. Olsen, Esben M. Jentoft, Sissel 2019-03-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518941/ http://www.ncbi.nlm.nih.gov/pubmed/30633410 https://doi.org/10.1111/mec.15010 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518941/ http://www.ncbi.nlm.nih.gov/pubmed/30633410 http://dx.doi.org/10.1111/mec.15010 © 2019 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Special Issue on the Role of Genomic Structural Variants in Adaptation and Diversification Text 2019 ftpubmed https://doi.org/10.1111/mec.15010 2019-05-26T00:23:31Z Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversions act as an important mechanism maintaining isolating barriers, yet their role in sympatric populations and divergence with gene flow is not entirely understood. Here, we revisit the question of whether inversions play a role in the divergence of connected populations of the marine fish Atlantic cod (Gadus morhua), by exploring a unique data set combining whole‐genome sequencing data and behavioural data obtained with acoustic telemetry. Within a confined fjord environment, we find three genetically differentiated Atlantic cod types belonging to the oceanic North Sea population, the western Baltic population and a local fjord‐type cod. Continuous behavioural tracking over 4 year revealed temporally stable sympatry of these types within the fjord. Despite overall weak genetic differentiation consistent with high levels of gene flow, we detected significant frequency shifts of three previously identified inversions, indicating an adaptive barrier to gene flow. In addition, behavioural data indicated that North Sea cod and individuals homozygous for the LG12 inversion had lower fitness in the fjord environment. However, North Sea and fjord‐type cod also occupy different depths, possibly contributing to prezygotic reproductive isolation and representing a behavioural barrier to gene flow. Our results provide the first insights into a complex interplay of genomic and behavioural isolating barriers in Atlantic cod and establish a new model system towards an understanding of the role of genomic structural variants in adaptation and diversification. Text atlantic cod Gadus morhua PubMed Central (PMC) Molecular Ecology 28 6 1394 1411 |
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Open Polar |
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PubMed Central (PMC) |
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ftpubmed |
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English |
topic |
Special Issue on the Role of Genomic Structural Variants in Adaptation and Diversification |
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Special Issue on the Role of Genomic Structural Variants in Adaptation and Diversification Barth, Julia M. I. Villegas‐Ríos, David Freitas, Carla Moland, Even Star, Bastiaan André, Carl Knutsen, Halvor Bradbury, Ian Dierking, Jan Petereit, Christoph Righton, David Metcalfe, Julian Jakobsen, Kjetill S. Olsen, Esben M. Jentoft, Sissel Disentangling structural genomic and behavioural barriers in a sea of connectivity |
topic_facet |
Special Issue on the Role of Genomic Structural Variants in Adaptation and Diversification |
description |
Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversions act as an important mechanism maintaining isolating barriers, yet their role in sympatric populations and divergence with gene flow is not entirely understood. Here, we revisit the question of whether inversions play a role in the divergence of connected populations of the marine fish Atlantic cod (Gadus morhua), by exploring a unique data set combining whole‐genome sequencing data and behavioural data obtained with acoustic telemetry. Within a confined fjord environment, we find three genetically differentiated Atlantic cod types belonging to the oceanic North Sea population, the western Baltic population and a local fjord‐type cod. Continuous behavioural tracking over 4 year revealed temporally stable sympatry of these types within the fjord. Despite overall weak genetic differentiation consistent with high levels of gene flow, we detected significant frequency shifts of three previously identified inversions, indicating an adaptive barrier to gene flow. In addition, behavioural data indicated that North Sea cod and individuals homozygous for the LG12 inversion had lower fitness in the fjord environment. However, North Sea and fjord‐type cod also occupy different depths, possibly contributing to prezygotic reproductive isolation and representing a behavioural barrier to gene flow. Our results provide the first insights into a complex interplay of genomic and behavioural isolating barriers in Atlantic cod and establish a new model system towards an understanding of the role of genomic structural variants in adaptation and diversification. |
format |
Text |
author |
Barth, Julia M. I. Villegas‐Ríos, David Freitas, Carla Moland, Even Star, Bastiaan André, Carl Knutsen, Halvor Bradbury, Ian Dierking, Jan Petereit, Christoph Righton, David Metcalfe, Julian Jakobsen, Kjetill S. Olsen, Esben M. Jentoft, Sissel |
author_facet |
Barth, Julia M. I. Villegas‐Ríos, David Freitas, Carla Moland, Even Star, Bastiaan André, Carl Knutsen, Halvor Bradbury, Ian Dierking, Jan Petereit, Christoph Righton, David Metcalfe, Julian Jakobsen, Kjetill S. Olsen, Esben M. Jentoft, Sissel |
author_sort |
Barth, Julia M. I. |
title |
Disentangling structural genomic and behavioural barriers in a sea of connectivity |
title_short |
Disentangling structural genomic and behavioural barriers in a sea of connectivity |
title_full |
Disentangling structural genomic and behavioural barriers in a sea of connectivity |
title_fullStr |
Disentangling structural genomic and behavioural barriers in a sea of connectivity |
title_full_unstemmed |
Disentangling structural genomic and behavioural barriers in a sea of connectivity |
title_sort |
disentangling structural genomic and behavioural barriers in a sea of connectivity |
publisher |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518941/ http://www.ncbi.nlm.nih.gov/pubmed/30633410 https://doi.org/10.1111/mec.15010 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518941/ http://www.ncbi.nlm.nih.gov/pubmed/30633410 http://dx.doi.org/10.1111/mec.15010 |
op_rights |
© 2019 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/mec.15010 |
container_title |
Molecular Ecology |
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28 |
container_issue |
6 |
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1394 |
op_container_end_page |
1411 |
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1766357577135816704 |