Journal
MOLECULAR ECOLOGY
Volume 21, Issue 23, Pages 5643-5645Publisher
WILEY
DOI: 10.1111/mec.12058
Keywords
hybridization; phylogeography; population genetics-empirical; speciation
Funding
- BBSRC [BB/G006903/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/G006903/1] Funding Source: researchfish
- Biotechnology and Biological Sciences Research Council [BB/G006903/1] Funding Source: Medline
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Tropical butterflies in the genus Heliconius have long been models in the study of the stages of speciation. Heliconius are unpalatable to predators, and many species are notable for multiple geographic populations with striking warning colour pattern differences associated with Mullerian mimicry. A speciation continuum is evident in Heliconius hybrid zones. Examples range from hybrid zones across which (a) there is little genetic differentiation other than at mimicry loci, but where hybrids are common, (b) to bimodal hybrid zones with strong genetic divergence and few hybrids, (c) through to good sympatric species, with hybridization extremely rare or absent. Now, in this issue of Molecular Ecology, Arias et al. (2012) have found an intermediate case in Colombian Heliconius cydno showing evidence for assortative mating and molecular differences, but where hybrids are abundant.
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