Journal
ECOLOGY LETTERS
Volume 18, Issue 12, Pages 1366-1375Publisher
WILEY
DOI: 10.1111/ele.12531
Keywords
Female choice; hybridisation; introgression; lizards; male-male competition
Categories
Funding
- National Geographic Society
- British Ecological Society
- NERC NBAF
- Royal Society of London
- FP7 Marie Curie Fellowship
- BBSRC studentship
- A.G. Leventis scholarship
- NERC studentship
- University of Tasmania Graduate Research Scholarship
- Fundacao para a Ciencia e a Tecnologia post-doctoral grant [SFRH/BPD/94582/2013]
- European Science Foundation [EG/3312]
- Spanish Ministry of Education and Science
- Royal Society
- Knut and Alice Wallenberg Foundations
- German Science Foundation (DFG) [GRK 1319]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/94582/2013] Funding Source: FCT
- Natural Environment Research Council [NBAF010001] Funding Source: researchfish
- NERC [NBAF010001] Funding Source: UKRI
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Hybridisation is increasingly recognised as an important cause of diversification and adaptation. Here, we show how divergence in male secondary sexual characters between two lineages of the common wall lizard (Podarcis muralis) gives rise to strong asymmetries in male competitive ability and mating success, resulting in asymmetric hybridisation upon secondary contact. Combined with no negative effects of hybridisation on survival or reproductive characters in F1-hybrids, these results suggest that introgression should be asymmetric, resulting in the displacement of sexual characters of the sub-dominant lineage. This prediction was confirmed in two types of secondary contact, across a natural contact zone and in two introduced populations. Our study illustrates how divergence in sexually selected traits via male competition can determine the direction and extent of introgression, contributing to geographic patterns of genetic and phenotypic diversity.
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