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Spatial variation in gene flow across a hybrid zone reveals causes of reproductive isolation and asymmetric introgression in wall lizards

Citation

Yang, W and Feiner, N and Laakkonen, H and Sacchi, R and Zuffi, MAL and Scali, S and While, GM and Uller, T, Spatial variation in gene flow across a hybrid zone reveals causes of reproductive isolation and asymmetric introgression in wall lizards, Evolution pp. 1-12. ISSN 1558-5646 (2020) [Refereed Article]


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Copyright 2020 The Authors. Licensed under Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) https://creativecommons.org/licenses/by-nc/4.0/

DOI: doi:10.1111/evo.14001

Abstract

Hybrid zones provide insights into the evolution of reproductive isolation. Sexual selection can contribute to the evolution of reproductive barriers, but it remains poorly understood how sexual traits impact gene flow in secondary contact. Here, we show that a recently evolved suite of sexual traits that function in male‐male competition mediates gene flow between two lineages of wall lizards (Podarcis muralis). Gene flow was relatively low and asymmetric in the presence of exaggerated male morphology and coloration compared to when the lineages share the ancestral phenotype. Putative barrier loci were enriched in genomic regions that were highly differentiated between the two lineages and showed low concordance between the transects. The exception was a consistently low genetic exchange around ATXN1, a gene that modulates social behavior. We suggest that this gene may contribute to the male mate preferences that are known to cause lineage‐assortative mating in this species. Although female choice modulates the degree of reproductive isolation in a variety of taxa, wall lizards demonstrate that both male‐male competition and male mate choice can contribute to the extent of gene flow between lineages.

Item Details

Item Type:Refereed Article
Keywords:barrier loci, genomic cline analysis, hybrid zone, introgression, Podarcis muralis , sexual selection
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Genetics not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:While, GM (Dr Geoff While)
UTAS Author:Uller, T (Dr Tobias Uller)
ID Code:139278
Year Published:2020
Web of Science® Times Cited:7
Deposited By:Zoology
Deposited On:2020-06-04
Last Modified:2020-08-24
Downloads:2 View Download Statistics

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