Disentangling structural genomic and behavioral 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://hdl.handle.net/11250/2598563 https://doi.org/10.1111/mec.15010 |
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ftimr:oai:imr.brage.unit.no:11250/2598563 2023-05-15T15:27:06+02:00 Disentangling structural genomic and behavioral barriers in a sea of connectivity Barth, Julia Maria Isis 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 Sigurd Olsen, Esben Moland Jentoft, Sissel 2019 application/pdf http://hdl.handle.net/11250/2598563 https://doi.org/10.1111/mec.15010 eng eng EC/FP7/625852 Norges forskningsråd: 280453 Norges forskningsråd: 221734 Molecular Ecology. 2019, 28 (6), 1394-1411. urn:issn:0962-1083 http://hdl.handle.net/11250/2598563 https://doi.org/10.1111/mec.15010 cristin:1660602 1394-1411 28 Molecular Ecology 6 Journal article Peer reviewed 2019 ftimr https://doi.org/10.1111/mec.15010 2021-09-23T20:14:30Z 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. acceptedVersion publishedVersion Article in Journal/Newspaper atlantic cod Gadus morhua Institute for Marine Research: Brage IMR Molecular Ecology 28 6 1394 1411 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
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. acceptedVersion publishedVersion |
format |
Article in Journal/Newspaper |
author |
Barth, Julia Maria Isis 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 Sigurd Olsen, Esben Moland Jentoft, Sissel |
spellingShingle |
Barth, Julia Maria Isis 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 Sigurd Olsen, Esben Moland Jentoft, Sissel Disentangling structural genomic and behavioral barriers in a sea of connectivity |
author_facet |
Barth, Julia Maria Isis 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 Sigurd Olsen, Esben Moland Jentoft, Sissel |
author_sort |
Barth, Julia Maria Isis |
title |
Disentangling structural genomic and behavioral barriers in a sea of connectivity |
title_short |
Disentangling structural genomic and behavioral barriers in a sea of connectivity |
title_full |
Disentangling structural genomic and behavioral barriers in a sea of connectivity |
title_fullStr |
Disentangling structural genomic and behavioral barriers in a sea of connectivity |
title_full_unstemmed |
Disentangling structural genomic and behavioral barriers in a sea of connectivity |
title_sort |
disentangling structural genomic and behavioral barriers in a sea of connectivity |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2598563 https://doi.org/10.1111/mec.15010 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
1394-1411 28 Molecular Ecology 6 |
op_relation |
EC/FP7/625852 Norges forskningsråd: 280453 Norges forskningsråd: 221734 Molecular Ecology. 2019, 28 (6), 1394-1411. urn:issn:0962-1083 http://hdl.handle.net/11250/2598563 https://doi.org/10.1111/mec.15010 cristin:1660602 |
op_doi |
https://doi.org/10.1111/mec.15010 |
container_title |
Molecular Ecology |
container_volume |
28 |
container_issue |
6 |
container_start_page |
1394 |
op_container_end_page |
1411 |
_version_ |
1766357569545175040 |