Hydrocarbon Patterns and Mating Behaviour in Populations of Drosophila yakuba

Denis, Béatrice; Rouzic, Arnaud Le; Wicker-Thomas, Claude

doi:10.3390/insects6040897

Cited by 4 publications

(8 citation statements)

References 32 publications

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“…While this result supports the predictions of reinforcement, we argue it must depend on species definitions. For example, multiple instances in the literature report strong assortative mating between populations of the same species (i.e., D. lacertosa: Table 2 (45); and 14 other species in (46)). Researchers are more likely to classify strongly isolated sympatric groups as different taxonomic species since their isolation has been "tested" in secondary contact.…”

Section: Discussionmentioning

confidence: 99%

Reinforcement alone does not explain increased reproductive isolation in sympatry

Matute

Cooper

2021

Preprint

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Comparative studies of reproductive isolation (RI) by Coyne and Orr (1, 2) and others indicate a significant role for reinforcing natural selection in Drosophila speciation. The reinforcement hypothesis predicts increased prezygotic, but not postzygotic, RI between sympatric species pairs in response to maladaptive hybridization. We revisit this hypothesis and others using additional Drosophila, Lepidopteran, and toad (Bufo) data. In contrast to the predictions of reinforcement, we find increased premating and postzygotic RI between sympatric Drosophila species, including between recently diverged species pairs, as defined by Coyne and Orr (1) and others (i.e., DNei < 0.5). However, at slightly lower divergence thresholds increased postzygotic RI in sympatry is not statistically significant, while increased premating RI is, generally in agreement with the predictions of reinforcement. While premating data are unavailable, postzygotic RI is also increased between sympatric Lepidopteran and toad (Bufo) species. We find only modest support for 'concordant asymmetries' in premating and postzygotic RI between sympatric Drosophila, described by others as uniquely supporting reinforcement. Finally, the proportion of geographic range overlap shared by species is positively associated with the magnitude of premating RI as predicted by reinforcement, but it is also positively associated with postzygotic RI, which cannot be explained by reinforcement. Taken together, our results demonstrate that comparisons of premating and postzygotic RI in sympatry depend greatly on divergence time, and suggest that fusion, extinction, and/or other mechanisms must combine with reinforcement to generate these patterns.

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Section: Discussionmentioning

confidence: 99%

Reinforcement alone does not explain increased reproductive isolation in sympatry

Matute

Cooper

2021

Preprint

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“…2012; Denis et al. 2015) and extensive phenotypic plasticity in CHCs (Thomas and Simmons 2011; Rajpurohit et al. 2017; Otte et al.…”

Section: Methodsmentioning

confidence: 99%

“…2015; Denis et al. 2015; Combs et al. 2018), little is known regarding changes of CHC composition in F1 hybrids and how these changes might affect the attractiveness of hybrids to pure‐species individuals.…”

mentioning

confidence: 99%

Pure species discriminate against hybrids in the Drosophila melanogaster species subgroup

et al. 2021

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Introgression, the exchange of alleles between species, is a common event in nature. This transfer of alleles between species must happen through fertile hybrids. Characterizing the traits that cause defects in hybrids illuminates how and when gene flow is expected to occur. Inviability and sterility are extreme examples of fitness reductions but are not the only type of defects in hybrids. Some traits specific to hybrids are more subtle but are important to determine their fitness. In this report, we study whether F1 hybrids between two species pairs of Drosophila are as attractive as the parental species. We find that in both species pairs, the sexual attractiveness of the F1 hybrids is reduced and that pure species discriminate strongly against them. We also find that the cuticular hydrocarbon (CHC) profile of the female hybrids is intermediate between the parental species. Perfuming experiments show that modifying the CHC profile of the female hybrids to resemble pure species improves their chances of mating.Our results show that behavioral discrimination against hybrids might be an important component of the persistence of species that can hybridize.

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“…Please note that there is variation between isofemale lines within species (Sharma et al 2012;Denis et al 2015) and extensive phenotypic plasticity in CHCs (Thomas and Simmons 2011;Rajpurohit et al 2017;Otte et al 2018). Details for each of these lines have been previously published.…”

Section: Stocksmentioning

confidence: 99%

“…Closely-related species commonly differ in the composition of CHCs (Shirangi et al 2009); these differences reduce the likelihood of matings between individuals from different species, effectively serving as a barrier to gene flow. Despite the robust research program reporting the differences in CHC composition between different species pairs (e.g., (Gleason et al 2009;Sharma et al 2012;Chung and Carroll 2015;Dembeck et al 2015;Denis et al 2015;Combs et al 2018)), little is known regarding changes of CHC composition in F1 hybrids and how these changes might affect the attractiveness of hybrids to pure species individuals.…”

Section: Introductionmentioning

confidence: 99%

Pure species discriminate against hybrids in theDrosophila melanogasterspecies subgroup

Serrato-Capuchina¹,

Schwochert²,

Zhang³

et al. 2020

Preprint

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Introgression, the exchange of alleles between species, is a common event in nature. This transfer of alleles between species must happen through fertile hybrids. Characterizing the traits that cause defects in hybrids illuminate how and when gene flow is expected to occur. Inviability and sterility are extreme examples of fitness reductions but are not the only type of defects in hybrids. Some traits specific to hybrids are more subtle but are important to determine their fitness. In this report, we study whether F1 hybrids between two species pairs of Drosophila are as attractive as the parental species. We find that in both species pairs, the sexual attractiveness of the F1 hybrids is reduced and that pure species discriminate strongly against them. We also find that the cuticular hydrocarbon (CHC) profile of the hybrids is intermediate between the parental species. Perfuming experiments show that modifying the CHC profile of the hybrids to resemble pure species improves their chances of mating. Our results show that behavioral discrimination against hybrids might be an important component of the persistence of species that can hybridize.

show abstract

Hydrocarbon Patterns and Mating Behaviour in Populations of Drosophila yakuba

Cited by 4 publications

References 32 publications

Reinforcement alone does not explain increased reproductive isolation in sympatry

Reinforcement alone does not explain increased reproductive isolation in sympatry

Pure species discriminate against hybrids in the Drosophila melanogaster species subgroup

Pure species discriminate against hybrids in theDrosophila melanogasterspecies subgroup

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