Allochrony in Atlantic Lumpfish : Genomic and Otolith Shape Divergence Between Spring and Autumn Spawners
Horaud, Mathilde (The Arctic University of Norway)
Raventós, Núria (Centre d'Estudis Avançats de Blanes)
Præbel, Kim (Inland Norway University of Applied Science)
Galià-Camps, Carles (Universitat de Barcelona)
Pegueroles, Cinta (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Carreras, Carlos (Universitat de Barcelona)
Pascual, Marta (Universitat de Barcelona)
Tuset, Victor M. (Universidad de Las Palmas de Gran Canaria)
Bhat, Shripathi (The Arctic University of Norway)
Lynghammar, Arve (The Arctic University of Norway)

Data:	2025
Resum:	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 () 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.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Allochrony ; Atlantique lumpfish ; Otolith shape ; Spawning grounds ; Whole genome sequencing
Publicat a:	Ecology and evolution, Vol. 15, Issue 2 (February 2025) , art. e70946, ISSN 2045-7758

DOI: 10.1002/ece3.70946
PMID: 39958818

15 p, 2.3 MB

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