期刊
MOLECULAR ECOLOGY
卷 29, 期 11, 页码 2016-2030出版社
WILEY
DOI: 10.1111/mec.15460
关键词
cline analysis; hybrid zones; Mullerian mimicry; parallel divergence; quantitative trait variation
资金
- Natural Environment Research Council [NE/K008498/1]
- Departamento Administrativo de Ciencia, Tecnologia e Innovacion [FP44842-5-2017]
- NERC [NBAF010003, NE/K008498/1] Funding Source: UKRI
Hybrid zones, where distinct populations meet and interbreed, give insight into how differences between populations are maintained despite gene flow. Studying clines in genetic loci and adaptive traits across hybrid zones is a powerful method for understanding how selection drives differentiation within a single species, but can also be used to compare parallel divergence in different species responding to a common selective pressure. Here, we study parallel divergence of wing colouration in the butterfliesHeliconius eratoandH. melpomene, which are distantly related Mullerian mimics which show parallel geographic variation in both discrete variation in pigmentation, and quantitative variation in structural colour. Using geographic cline analysis, we show that clines in these traits are positioned in roughly the same geographic region for both species, which is consistent with direct selection for mimicry. However, the width of the clines varies markedly between species. This difference is explained in part by variation in the strength of selection acting on colour traits within each species, but may also be influenced by differences in the dispersal rate and total strength of selection against hybrids between the species. Genotyping-by-sequencing also revealed weaker population structure inH. melpomene, suggesting the hybrid zones may have evolved differently in each species, which may also contribute to the patterns of phenotypic divergence in this system. Overall, we conclude that multiple factors are needed to explain patterns of clinal variation within and between these species, although mimicry has probably played a central role.
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