Temperature-associated selection linked to putative chromosomal inversions in king scallop (Pecten maximus)
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The genomic landscape of divergence—the distribution of differences among populations or species across the genome—is increasingly characterized to understand the role that microevolutionary forces such as natural selection and recombination play in causing and maintaining genetic divergence. This line of inquiry has also revealed chromosome structure variation to be an important factor shaping the landscape of adaptive genetic variation. Owing to a high prevalence of chromosome structure variation and the strong pressure for local adaptation necessitated by their sessile nature, bivalve molluscs are an ideal taxon for exploring the relationship between chromosome structure variation and local adaptation. Here, we report a population genomic survey of king scallop (Pecten maximus) across its natural range in the northeastern Atlantic Ocean, using a recent chromosome-level genome assembly. We report the presence of at least three large (12–22 Mb), putative chromosomal inversions associated with sea surface temperature and whose frequencies are in contrast to neutral population structure. These results highlight a potentially large role for recombination-suppressing chromosomal inversions in local adaptation and suggest a hypothesis to explain the maintenance of differences in reproductive timing found at relatively small spatial scales across king scallop populations.
Hollenbeck , C M , Portnoy , D S , Garcia de la serrana , D , Magnesen , T , Matejusova , I & Johnston , I A 2022 , ' Temperature-associated selection linked to putative chromosomal inversions in king scallop ( Pecten maximus ) ' , Proceedings of the Royal Society of London Series B: Biological Sciences , vol. 289 , no. 1984 , 20221573 . https://doi.org/10.1098/rspb.2022.1573
Proceedings of the Royal Society of London Series B: Biological Sciences
Copyright © 2022 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
DescriptionFunding: This study was initiated as part of the European Marine Biological Research Infrastructure Cluster (EMBRIC) project funded by the European Union's Horizon 2020 research and innovation programme under grant agreement no. 654008.
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