Disruptive sexual selection against hybrids contributes to speciation between<i>Heliconius cydno</i>and<i>Heliconius melpomene</i>

Naisbit, Russell E.; Jiggins, Chris D.; Mallet, James

doi:10.1098/rspb.2001.1753

Cited by 199 publications

(207 citation statements)

References 35 publications

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“…In Heliconius, reproductive character displacement, consistent with reinforcement, has been demonstrated, including between the taxa studied here. Males sampled from populations of H. melpomene in French Guiana, where H. cydno is absent, are more likely to court (and mate with) H. cydno females than individuals [11,14,22,34]. In particular, F 1 females are sterile, following Haldane's rule [35].…”

Section: Discussionmentioning

confidence: 99%

“…Despite these differences in habitat preference, the two species are often seen flying together, and hybrid individuals have been collected, albeit at very low frequencies (estimated at a frequency of just 0.001 [14]). Assortative mating between Heliconius melpomene and H. cydno is strong [11], and interspecific hybrids between H. melpomene and H. cydno are less attractive to males of either parental species [22]. Nevertheless, hybrids from crosses in one direction (H. cydno mother and H. melpomene father) can be produced, albeit with some difficulty, in the insectary.…”

Section: Introductionmentioning

confidence: 99%

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Disruptive ecological selection on a mating cue

et al. 2012

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Adaptation to divergent ecological niches can result in speciation. Traits subject to disruptive selection that also contribute to non-random mating will facilitate speciation with gene flow. Such 'magic' or 'multipleeffect' traits may be widespread and important for generating biodiversity, but strong empirical evidence is still lacking. Although there is evidence that putative ecological traits are indeed involved in assortative mating, evidence that these same traits are under divergent selection is considerably weaker. Heliconius butterfly wing patterns are subject to positive frequency-dependent selection by predators, owing to aposematism and Mü llerian mimicry, and divergent colour patterns are used by closely related species to recognize potential mates. The amenability of colour patterns to experimental manipulation, independent of other traits, presents an excellent opportunity to test their role during speciation. We conducted field experiments with artificial butterflies, designed to match natural butterflies with respect to avian vision. These were complemented with enclosure trials with live birds and real butterflies. Our experiments showed that hybrid colour-pattern phenotypes are attacked more frequently than parental forms. For the first time, we demonstrate disruptive ecological selection on a trait that also acts as a mating cue.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Disruptive ecological selection on a mating cue

et al. 2012

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“…In such cases of signal-preference coevolution, assortative mating helps to build and maintain LD between barrier loci. Direct selection can also favor divergence when the prezygotic barrier trait is a multiple-effect trait, such as a wing pattern that functions in mimicry as well as being a sexual signal (Merrill et al 2011; reviewed in Servedio et al 2011;Smadja and Butlin 2011) or when loci contributing to assortative mating also contribute to behavioral sterility (e.g., Naisbit et al 2001). In these cases, the component of selection due to reinforcement is just one part of the overall selection that favors enhancement of the barrier effect (Kirkpatrick and Servedio 1999).…”

Section: Adaptive Coupling With Furthermentioning

confidence: 99%

Coupling, Reinforcement, and Speciation

Butlin

Smadja

2018

The American Naturalist

183

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During the process of speciation, populations may diverge for traits and at their underlying loci that contribute barriers to gene flow. These barrier traits and barrier loci underlie individual barrier effects, by which we mean the contribution that a barrier locus or trait-or some combination of barrier loci or traits-makes to overall isolation. The evolution of strong reproductive isolation typically requires the origin of multiple barrier effects. Critically, it also requires the coincidence of barrier effects; for example, two barrier effects, one due to assortative mating and the other due to hybrid inviability, create a stronger overall barrier to gene flow if they coincide than if they distinguish independent pairs of populations. Here, we define "coupling" as any process that generates coincidence of barrier effects, resulting in a stronger overall barrier to gene flow. We argue that speciation research, both empirical and theoretical, needs to consider both the origin of barrier effects and the ways in which they are coupled. Coincidence of barrier effects can occur either as a by-product of selection on individual barrier effects or of population processes, or as an adaptive response to indirect selection. Adaptive coupling may be accompanied by further evolution that enhances individual barrier effects. Reinforcement, classically viewed as the evolution of prezygotic barriers to gene flow in response to costs of hybridization, is an example of this type of process. However, we argue for an extended view of reinforcement that includes coupling processes involving enhancement of any type of additional barrier effect as a result of an existing barrier. This view of coupling and reinforcement may help to guide development of both theoretical and empirical research on the process of speciation.

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“…However, populations in sympatry and allopatry should experience strong divergent selection, and speciation is a possible outcome of such divergent selection (Jiggins et al , 2004Naisbit et al 2001;Servedio 2004). …”

Section: Consequences Of Allopatric Mimicsmentioning

confidence: 99%

Mimics without models: causes and consequences of allopatry in Batesian mimicry complexes

Pfennig

Mullen

2010

Proc. R. Soc. B.

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Batesian mimicry evolves when a palatable species (the 'mimic') co-opts a warning signal from a dangerous species (the 'model') and thereby deceives its potential predators. Longstanding theory predicts that this protection from predation should break down where the model is absent. Thus, mimics are expected to only co-occur with their model. Yet, many mimics violate this prediction and occur in areas where their model is absent. Here, we discuss the causes and consequences of such allopatric mimics. We also describe how these 'rule-bending' mimics provide critical insights into diverse topics ranging from how Batesian mimicry evolves to its possible role in speciation.

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Disruptive sexual selection against hybrids contributes to speciation betweenHeliconius cydnoandHeliconius melpomene

Cited by 199 publications

References 35 publications

Disruptive ecological selection on a mating cue

Disruptive ecological selection on a mating cue

Coupling, Reinforcement, and Speciation

Mimics without models: causes and consequences of allopatry in Batesian mimicry complexes

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