Received: JAccepted: JanuPublished: February 6, 2020Ĭopyright: © 2020 Moest et al. Besansky, University of Notre Dame, UNITED STATES (2020) Selective sweeps on novel and introgressed variation shape mimicry loci in a butterfly adaptive radiation. Our genomic data reveal a surprisingly dynamic history of colour pattern selection and co-evolution in this adaptive radiation.Ĭitation: Moest M, Van Belleghem SM, James JE, Salazar C, Martin SH, Barker SL, et al. Simulated recipient populations show a distinct ‘volcano’ pattern with peaks of increased genetic diversity around the selected target, characteristic of sweeps of introgressed variation and consistent with diversity patterns found in some populations. Using simulations, we compare sweep signatures expected under classic hard sweeps with those resulting from adaptive introgression, an important aspect of mimicry evolution in Heliconius butterflies. These recent sweeps are similar between co-mimics and indicate colour pattern turn-over events despite strong stabilising selection. The strongest signatures correspond to loci with the greatest phenotypic effects, consistent with visual selection by predators, and are found in colour patterns with geographically restricted distributions. By analysing high-coverage genome sequence data from 4 major colour pattern loci sampled from nearly 600 individuals in 53 populations, we show pervasive selection on wing patterns in the Heliconius adaptive radiation. Natural selection leaves distinct signatures in the genome that can reveal the targets and history of adaptive evolution.
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