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Allochrony in Atlantic Lumpfish: Genomic and Otolith Shape Divergence Between Spring and Autumn Spawners.

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Title: Allochrony in Atlantic Lumpfish: Genomic and Otolith Shape Divergence Between Spring and Autumn Spawners.
Authors: Horaud, Mathilde1 (AUTHOR) mathilde.horaud@uit.no, Raventós, Núria2,3 (AUTHOR), Præbel, Kim1,4 (AUTHOR), Galià‐Camps, Carles2,5,6 (AUTHOR), Pegueroles, Cinta5,6,7 (AUTHOR), Carreras, Carlos5,6 (AUTHOR), Pascual, Marta5,6 (AUTHOR), Tuset, Victor M.8 (AUTHOR), Bhat, Shripathi1 (AUTHOR), Lynghammar, Arve1 (AUTHOR)
Source: Ecology & Evolution (20457758). Feb2025, Vol. 15 Issue 2, p1-15. 15p.
Subject Terms: Reproductive isolation, Whole genome sequencing, Spring, Mitochondrial DNA, Autumn, Gene flow, Spawning, Fish spawning
Abstract: Allochrony is a form of reproductive isolation characterized by differences in the timing of spawning and may play a crucial role in the genetic and phenotypic divergence within species. The Atlantic lumpfish (Cyclopterus lumpus) is known to spawn in spring and autumn. However, the role of allochrony on the genomic structure of this species has not been addressed. Here, by combining whole genome sequencing data and otolith shape of 64 specimens, we explore the evolutionary drivers of divergence in Atlantic lumpfish, focusing on spring and autumn spawners sampled at two well‐separated spawning grounds along the Norwegian coast. Overall, we identified pronounced genomic and morphologic differences between the two spawning groups. Genomic differences between the two groups were concentrated in three chromosomes, with a region of chromosome 1 encompassing the same single nucleotide polymorphisms (SNPs) driving differential season spawning for both localities, suggesting parallel responses. The functional analysis of the SNPs in this region revealed genes associated with responses to environmental stressors, possibly adaptations to seasonal variations at high latitudes. The morphological analysis of otoliths supported these findings, showing differences compatible with adaptations to seasonal light availability. The presence of genomic islands of divergence, alongside a general lack of differentiation across the mitochondrial genome, suggest recent and rapid selection processes potentially modulated by ongoing gene flow. This study underscores the importance of considering temporal genetic structures, particularly for species with bimodal spawning time, in conservation and management strategies to prevent overexploitation and optimize breeding programs. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Allochrony in Atlantic Lumpfish: Genomic and Otolith Shape Divergence Between Spring and Autumn Spawners.
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  Data: <searchLink fieldCode="AR" term="%22Horaud%2C+Mathilde%22">Horaud, Mathilde</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mathilde.horaud@uit.no</i><br /><searchLink fieldCode="AR" term="%22Raventós%2C+Núria%22">Raventós, Núria</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Præbel%2C+Kim%22">Præbel, Kim</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Galià‐Camps%2C+Carles%22">Galià‐Camps, Carles</searchLink><relatesTo>2,5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pegueroles%2C+Cinta%22">Pegueroles, Cinta</searchLink><relatesTo>5,6,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Carreras%2C+Carlos%22">Carreras, Carlos</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pascual%2C+Marta%22">Pascual, Marta</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tuset%2C+Victor+M%2E%22">Tuset, Victor M.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bhat%2C+Shripathi%22">Bhat, Shripathi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lynghammar%2C+Arve%22">Lynghammar, Arve</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Feb2025, Vol. 15 Issue 2, p1-15. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Reproductive+isolation%22">Reproductive isolation</searchLink><br /><searchLink fieldCode="DE" term="%22Whole+genome+sequencing%22">Whole genome sequencing</searchLink><br /><searchLink fieldCode="DE" term="%22Spring%22">Spring</searchLink><br /><searchLink fieldCode="DE" term="%22Mitochondrial+DNA%22">Mitochondrial DNA</searchLink><br /><searchLink fieldCode="DE" term="%22Autumn%22">Autumn</searchLink><br /><searchLink fieldCode="DE" term="%22Gene+flow%22">Gene flow</searchLink><br /><searchLink fieldCode="DE" term="%22Spawning%22">Spawning</searchLink><br /><searchLink fieldCode="DE" term="%22Fish+spawning%22">Fish spawning</searchLink>
– Name: Abstract
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  Data: Allochrony is a form of reproductive isolation characterized by differences in the timing of spawning and may play a crucial role in the genetic and phenotypic divergence within species. The Atlantic lumpfish (Cyclopterus lumpus) is known to spawn in spring and autumn. However, the role of allochrony on the genomic structure of this species has not been addressed. Here, by combining whole genome sequencing data and otolith shape of 64 specimens, we explore the evolutionary drivers of divergence in Atlantic lumpfish, focusing on spring and autumn spawners sampled at two well‐separated spawning grounds along the Norwegian coast. Overall, we identified pronounced genomic and morphologic differences between the two spawning groups. Genomic differences between the two groups were concentrated in three chromosomes, with a region of chromosome 1 encompassing the same single nucleotide polymorphisms (SNPs) driving differential season spawning for both localities, suggesting parallel responses. The functional analysis of the SNPs in this region revealed genes associated with responses to environmental stressors, possibly adaptations to seasonal variations at high latitudes. The morphological analysis of otoliths supported these findings, showing differences compatible with adaptations to seasonal light availability. The presence of genomic islands of divergence, alongside a general lack of differentiation across the mitochondrial genome, suggest recent and rapid selection processes potentially modulated by ongoing gene flow. This study underscores the importance of considering temporal genetic structures, particularly for species with bimodal spawning time, in conservation and management strategies to prevent overexploitation and optimize breeding programs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/ece3.70946
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      – Code: eng
        Text: English
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        PageCount: 15
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      – SubjectFull: Reproductive isolation
        Type: general
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      – SubjectFull: Spring
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      – SubjectFull: Mitochondrial DNA
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      – SubjectFull: Autumn
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      – SubjectFull: Spawning
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      – TitleFull: Allochrony in Atlantic Lumpfish: Genomic and Otolith Shape Divergence Between Spring and Autumn Spawners.
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              Text: Feb2025
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