Reproductive isolation related to mimetic divergence in the poison frog Ranitomeya imitator

Twomey, Evan; Vestergaard, Jacob S.; Summers, Kyle

doi:10.1038/ncomms5749

Cited by 41 publications

(54 citation statements)

References 52 publications

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“…In several adaptive radiations, selection on differentiated color phenotypes is thought to precipitate speciation through its roles in mate choice and premating reproductive isolation (23,41,42). In the mimicry radiation of Heliconius, preference for a similar mate (positive assortative mating) may evolve in response to the poor mimicry of heterozygous genotypes at mimicry loci (42), and it operates as a key driver of speciation along the entire continuum of differentiation, from the early stages of ecological divergence (10) to the maintenance and strengthening of species differences (42).…”

Section: Resultsmentioning

confidence: 99%

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Polymorphism at a mimicry supergene maintained by opposing frequency-dependent selection pressures

Chouteau

Llaurens

Piron‐Prunier

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

105

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Explaining the maintenance of adaptive diversity within populations is a long-standing goal in evolutionary biology, with important implications for conservation, medicine, and agriculture. Adaptation often leads to the fixation of beneficial alleles, and therefore it erodes local diversity so that understanding the coexistence of multiple adaptive phenotypes requires deciphering the ecological mechanisms that determine their respective benefits. Here, we show how antagonistic frequency-dependent selection (FDS), generated by natural and sexual selection acting on the same trait, maintains mimicry polymorphism in the toxic butterfly Heliconius numata. Positive FDS imposed by predators on mimetic signals favors the fixation of the most abundant and best-protected wing-pattern morph, thereby limiting polymorphism. However, by using mate-choice experiments, we reveal disassortative mate preferences of the different wing-pattern morphs. The resulting negative FDS on wing-pattern alleles is consistent with the excess of heterozygote genotypes at the supergene locus controlling wing-pattern variation in natural populations of H. numata. The combined effect of positive and negative FDS on visual signals is sufficient to maintain a diversity of morphs displaying accurate mimicry with other local prey, although some of the forms only provide moderate protection against predators. Our findings help understand how alternative adaptive phenotypes can be maintained within populations and emphasize the need to investigate interactions between selective pressures in other cases of puzzling adaptive polymorphism.disassortative mating | selection conflicts | Müllerian mimicry | aposematism | warning signals

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Section: Resultsmentioning

confidence: 99%

“…Warning color patterns may also be used as mate recognition cues (3,(19)(20)(21)(22)(23). Mate preference generally causes positive assortative mating between individuals with the same phenotype and may reinforce local monomorphism in the warning signal.…”

mentioning

confidence: 99%

Polymorphism at a mimicry supergene maintained by opposing frequency-dependent selection pressures

Chouteau

Llaurens

Piron‐Prunier

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

105

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“…and we suggest that differences in mimicry patterns might play a role in the evolution of the mountain species. Membership in different aposematic rings has been found to be a factor limiting the gene flow in other organisms (e.g., Merrill et al 2014;Twomey et al 2014).…”

Section: Discussionmentioning

confidence: 99%

High diversity and endemism in the genus Cautires Waterhouse, 1879 (Coleoptera: Lycidae) from the Malay mountain forests, with the descriptions of fourteen new species

Jiruskova

Motyka

Bocák

2016

EJT

807

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“…We used published microsatellite data from three sources: Twomey et al [20] (92 samples), Twomey et al [42] (36 samples) and Twomey [43]. The final dataset consisted of 285 R. imitator individuals from 16 localities in Peru: the 11 localities shown in figure 1 and five localities between Santa Rosa de Chipaota and Achinamisa (i.e.…”

Section: Image and Microsatellite Datamentioning

confidence: 99%

Number of genes controlling a quantitative trait in a hybrid zone of the aposematic frogRanitomeya imitator

et al. 2015

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The number of genes controlling mimetic traits has been a topic of much research and discussion. In this paper, we examine a mimetic, dendrobatid frog Ranitomeya imitator, which harbours extensive phenotypic variation with multiple mimetic morphs, not unlike the celebrated Heliconius system. However, the genetic basis for this polymorphism is unknown, and not easy to determine using standard experimental approaches, for this hard-to-breed species. To circumvent this problem, we first develop a new protocol for automatic quantification of complex colour pattern phenotypes from images. Using this method, which has the potential to be applied in many other systems, we define a phenotype associated with differences in colour pattern between different mimetic morphs. We then proceed to develop a maximum-likelihood method for estimating the number of genes affecting a quantitative trait segregating in a hybrid zone. This method takes advantage of estimates of admixture proportions obtained using genetic data, such as microsatellite markers, and is applicable to any other system where a phenotype has been quantified in an admixture/introgression zone. We evaluate the method using extensive simulations and apply it to the R. imitator system. We show that probably one or two, or at most three genes, control the mimetic phenotype segregating in a R. imitator hybrid zone identified using image analyses.

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Reproductive isolation related to mimetic divergence in the poison frog Ranitomeya imitator

Cited by 41 publications

References 52 publications

Polymorphism at a mimicry supergene maintained by opposing frequency-dependent selection pressures

Polymorphism at a mimicry supergene maintained by opposing frequency-dependent selection pressures

High diversity and endemism in the genus Cautires Waterhouse, 1879 (Coleoptera: Lycidae) from the Malay mountain forests, with the descriptions of fourteen new species

Number of genes controlling a quantitative trait in a hybrid zone of the aposematic frogRanitomeya imitator

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