Population genomics of rapid evolution in natural populations: polygenic selection in response to power station thermal effluents

BMC Evolutionary Biology
David I DayanMarjorie F Oleksiak

Abstract

Examples of rapid evolution are common in nature but difficult to account for with the standard population genetic model of adaptation. Instead, selection from the standing genetic variation permits rapid adaptation via soft sweeps or polygenic adaptation. Empirical evidence of this process in nature is currently limited but accumulating. We provide genome-wide analyses of rapid evolution in Fundulus heteroclitus populations subjected to recently elevated temperatures due to coastal power station thermal effluents using 5449 SNPs across two effluent-affected and four reference populations. Bayesian and multivariate analyses of population genomic structure reveal a substantial portion of genetic variation that is most parsimoniously explained by selection at the site of thermal effluents. An FST outlier approach in conjunction with additional conservative requirements identify significant allele frequency differentiation that exceeds neutral expectations among exposed and closely related reference populations. Genomic variation patterns near these candidate loci reveal that individuals living near thermal effluents have rapidly evolved from the standing genetic variation through small allele frequency changes at many loci in a p...Continue Reading

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Citations

Jul 10, 2019·Integrative and Comparative Biology·Jessica L McKenziePatricia M Schulte
Dec 15, 2020·Genome Biology and Evolution·Moritz A EhrlichDouglas L Crawford
Feb 23, 2021·Genome Biology and Evolution·Moritz A EhrlichDouglas L Crawford

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Methods Mentioned

BETA
GTPase
electrophoresis
genotyping
Hi-Seq2500
PCA

Software Mentioned

Functional Annotation Clustering Tool
STRUCTURE
pRDA
rda
AMOVA
Lositan
FDIST2
R package adespatial
bowtie2
LOESS

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