Hybridization Reveals the Evolving Genomic Architecture of Speciation

Kronforst, Marcus R.; Hansen, Matthew E.B.; Crawford, Nicholas G.; Gallant, Jason R.; Zhang, W.; Kulathinal, Rob J.; Kapan, Durrell D.; Mullen, Sean P.

doi:10.1016/j.celrep.2013.09.042

Cited by 136 publications

(188 citation statements)

References 83 publications

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“…Heliconiini have been at the center of the debate about species concepts and designation criteria, providing empirical evidence for the permeability of species barriers Nadeau et al 2013;Kronforst et al 2013;Martin et al 2013). Species delimitation with the PTP based on relative branch lengths in the ML tree produced very surprising, although poorly supported results, strongly at odds with biological knowledge of Heliconiini.…”

Section: Number Of Species and Taxonomic Implicationsmentioning

confidence: 55%

Multilocus Species Trees Show the Recent Adaptive Radiation of the Mimetic Heliconius Butterflies

Kozak

Wahlberg

Neild

et al. 2014

Preprint

129

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Abstract.-Müllerian mimicry among Neotropical Heliconiini butterflies is an excellent example of natural selection, associated with the diversification of a large continental-scale radiation. Some of the processes driving the evolution of mimicry rings are likely to generate incongruent phylogenetic signals across the assemblage, and thus pose a challenge for systematics. We use a data set of 22 mitochondrial and nuclear markers from 92% of species in the tribe, obtained by Sanger sequencing and de novo assembly of short read data, to re-examine the phylogeny of Heliconiini with both supermatrix and multispecies coalescent approaches, characterize the patterns of conflicting signal, and compare the performance of various methodological approaches to reflect the heterogeneity across the data. Despite the large extent of reticulate signal and strong conflict between markers, nearly identical topologies are consistently recovered by most of the analyses, although the supermatrix approach failed to reflect the underlying variation in the history of individual loci. However, the supermatrix represents a useful approximation where multiple rare species represented by short sequences can be incorporated easily. The first comprehensive, time-calibrated phylogeny of this group is used to test the hypotheses of a diversification rate increase driven by the dramatic environmental changes in the Neotropics over the past 23 myr, or changes caused by diversity-dependent effects on the rate of diversification. We find that the rate of diversification has increased on the branch leading to the presently most species-rich genus Heliconius, but the change occurred gradually and cannot be unequivocally attributed to a specific environmental driver. Our study provides comprehensive comparison of philosophically distinct species tree reconstruction methods and provides insights into the diversification of an important insect radiation in the most biodiverse region of the planet.

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Section: Number Of Species and Taxonomic Implicationsmentioning

confidence: 55%

Multilocus Species Trees Show the Recent Adaptive Radiation of the Mimetic Heliconius Butterflies

Kozak

Wahlberg

Neild

et al. 2014

Preprint

129

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“…Modeling suggests that the species diverged around 1.5 million years ago, with hybridization rare or absent for one million years, followed by a period of more abundant gene flow in the last half a million years (Kronforst et al. 2013; Martin et al. 2015b), suggesting that the species originated in parapatry, but have been broadly sympatric and hybridizing during their recent history.…”

Section: Introductionmentioning

confidence: 99%

No evidence for maintenance of a sympatricHeliconiusspecies barrier by chromosomal inversions

et al. 2017

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Mechanisms that suppress recombination are known to help maintain species barriers by preventing the breakup of coadapted gene combinations. The sympatric butterfly species Heliconius melpomene and Heliconius cydno are separated by many strong barriers, but the species still hybridize infrequently in the wild, and around 40% of the genome is influenced by introgression. We tested the hypothesis that genetic barriers between the species are maintained by inversions or other mechanisms that reduce between‐species recombination rate. We constructed fine‐scale recombination maps for Panamanian populations of both species and their hybrids to directly measure recombination rate within and between species, and generated long sequence reads to detect inversions. We find no evidence for a systematic reduction in recombination rates in F1 hybrids, and also no evidence for inversions longer than 50 kb that might be involved in generating or maintaining species barriers. This suggests that mechanisms leading to global or local reduction in recombination do not play a significant role in the maintenance of species barriers between H. melpomene and H. cydno.

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“…Heliconius butterflies have likewise become a model system for studying patterns of speciation in the putative presence of ongoing gene flow (Dasmahapatra et al., 2012; Kronforst et al., 2006, 2013; Nadeau et al., 2013). Most Heliconius species are Müllerian mimics of one another, as well as other unpalatable taxa, displaying shared, aposematic wing patterns that are maintained by positive numerically dependent selection.…”

Section: Introductionmentioning

confidence: 99%

Quantified reproductive isolation inHeliconiusbutterflies: Implications for introgression and hybrid speciation

Garzón‐Orduña

Brower

2017

Ecology and Evolution

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Heliconius butterflies have become a model for the study of speciation with gene flow. For adaptive introgression to take place, there must be incomplete barriers to gene exchange that allow interspecific hybridization and multiple generations of backcrossing. The recent publication of estimates of individual components of reproductive isolation between several species of butterflies in the Heliconius melpomene–H. cydno clade allowed us to calculate total reproductive isolation estimates for these species. According to these estimates, the butterflies are not as promiscuous as has been implied. Differences between species are maintained by intrinsic mechanisms, while reproductive isolation of geographical races within species is mainly due to allopatry. We discuss the implications of this strong isolation for basic aspects of the hybrid speciation with introgression hypothesis.

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Hybridization Reveals the Evolving Genomic Architecture of Speciation

Cited by 136 publications

References 83 publications

Multilocus Species Trees Show the Recent Adaptive Radiation of the Mimetic Heliconius Butterflies

Multilocus Species Trees Show the Recent Adaptive Radiation of the Mimetic Heliconius Butterflies

No evidence for maintenance of a sympatricHeliconiusspecies barrier by chromosomal inversions

Quantified reproductive isolation inHeliconiusbutterflies: Implications for introgression and hybrid speciation

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