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Abstract

Strongly selected characters can be transferred from one lineage to another with limitedgenetic exchange, resulting in asymmetric introgression and a mosaic genome in thereceiving population. However, systems are rarely sufficiently well studied to link the patternof introgression to its underlying process. Male common wall lizards in western Italy exhibitexaggeration of a suite of sexually selected characters that make them outcompete malesfrom a distantly related lineage that lack these characters. This results in asymmetrichybridization and adaptive introgression of the suite of characters following secondarycontact. We developed genome-wide markers to infer the demographic history of gene flowbetween different genetic lineages, identify the spread of the sexually selected syndrome, and test the prediction that introgression should be asymmetric and heterogeneous across the genome. Our results show that secondary contact was accompanied by gene flow in both directions across most of the genome, but with approximately 3% of the genome showing highly asymmetric introgression in the predicted direction. Demographic simulations reveal that this asymmetric gene flow is more recent than the initial secondary contact, and the data suggest that the exaggerated male sexual characters originated within the Italian lineage and subsequently spread throughout this lineage before eventually reaching the contact zone. These results demonstrate that sexual selection can cause a suite of characters to spread throughout both closely and distantly related lineages with limited gene flow across the genome at large.

Item Type:	Article
Authors/Creators:	Yang, W and While, GM and Laakkonen, H and Sacchi, R and Zuffi, MAL and Scali, S and Salvi, D and Uller, T
Keywords:	asymmetric introgression, sexual selection, mosaic genome, Podarcis muralis
Journal or Publication Title:	Molecular Ecology
Publisher:	Blackwell Publishing Ltd
ISSN:	0962-1083
DOI / ID Number:	https://doi.org/10.1111/mec.14861
Copyright Information:	© 2018 John Wiley & Sons Ltd. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This is the peer reviewed version which has been published in final form at: http://dx.doi.org/10.1111/mec.14861
Related URLs:	Google Scholar: While, GM UTAS Profile: While, GM
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