Within-Generation Polygenic Selection Shapes Fitness-Related Traits across Environments in Juvenile Sea Bream

Type Article
Date 2020-04
Language English
Author(s) Rey Carine1, 2, Darnaude Audrey3, Ferraton Franck3, Guinand Bruno1, Bonhomme François1, Bierne Nicolas1, Gagnaire Pierre-Alexandre1
Affiliation(s) 1 : ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
2 : Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, INSERM U1210, Laboratoire de Biologie et Modélisation de la Cellule, 15 parvis Descartes, F-69007 Lyon, France
3 : MARBEC, Univ Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France
Source Genes (2073-4425) (MDPI AG), 2020-04 , Vol. 11 , N. 4 , P. 398 (17p.)
DOI 10.3390/genes11040398
WOS© Times Cited 5
Note This article belongs to the Special Issue Genetic Diversity of Marine Populations
Keyword(s) antagonistic pleiotropy, habitat association, fitness trade-off, juvenile growth, polygenic scores, RAD-sequencing, spatially varying selection

Understanding the genetic underpinnings of fitness trade-o s across spatially variable environments remains a major challenge in evolutionary biology. In Mediterranean gilthead sea bream, first-year juveniles use various marine and brackish lagoon nursery habitats characterized by a trade-o between food availability and environmental disturbance. Phenotypic di erences among juveniles foraging in di erent habitats rapidly appear after larval settlement, but the relative role of local selection and plasticity in phenotypic variation remains unclear. Here, we combine phenotypic and genetic data to address this question. We first report correlations of opposite signs between growth and condition depending on juvenile habitat type. Then, we use single nucleotide polymorphism (SNP) data obtained by Restriction Associated DNA (RAD) sequencing to search for allele frequency changes caused by a single generation of spatially varying selection between habitats. We found evidence for moderate selection operating at multiple loci showing subtle allele frequency shifts between groups of marine and brackish juveniles. We identified subsets of candidate outlier SNPs that, in interaction with habitat type, additively explain up to 3.8% of the variance in juvenile growth and 8.7% in juvenile condition; these SNPs also explained significant fraction of growth rate in an independent larval sample. Our results indicate that selective mortality across environments during early-life stages involves complex trade-o s between alternative growth strategies

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Rey Carine, Darnaude Audrey, Ferraton Franck, Guinand Bruno, Bonhomme François, Bierne Nicolas, Gagnaire Pierre-Alexandre (2020). Within-Generation Polygenic Selection Shapes Fitness-Related Traits across Environments in Juvenile Sea Bream. Genes, 11(4), 398 (17p.). Publisher's official version : https://doi.org/10.3390/genes11040398 , Open Access version : https://archimer.ifremer.fr/doc/00622/73370/