Species specificity and intraspecific variation in the chemical profiles of Heliconius butterflies across a large geographic range

Ecology and Evolution, Journal Year: 2020, Volume and Issue: 10(9), P. 3895 - 3918

Published: April 3, 2020

Abstract In many animals, mate choice is important for the maintenance of reproductive isolation between species. Traits and behavioral are predicted to be under strong stabilizing selection within species; however, such traits can also exhibit variation at population level driven by neutral adaptive evolutionary processes. Here, we describe patterns divergence among androconial genital chemical profiles inter‐ intraspecific levels in mimetic Heliconius butterflies. Most bouquets was found species, but there were quantitative differences level. We a correlation interspecific genetic divergence, this varied comparisons. identified “indicator” compounds characteristic particular species that included already known elicit response, suggesting an approach identification candidate future studies novel systems. Overall, signal identity suggests role these recognition, with additional potentially .

Language: Английский

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Divergence of chemosensing during the early stages of speciation

Proceedings of the National Academy of Sciences, Journal Year: 2020, Volume and Issue: 117(28), P. 16438 - 16447

Published: June 29, 2020

Chemosensory communication is essential to insect biology, playing indispensable roles during mate-finding, foraging, and oviposition behaviors. These traits are particularly important speciation, where chemical perception may serve establish species barriers. However, identifying genes associated with such complex behavioral remains a significant challenge. Through combination of transcriptomic genomic approaches, we characterize the genetic architecture chemoperception role chemosensing speciation for young pair Heliconius butterflies, melpomene cydno We provide detailed description chemosensory gene-expression profiles as they relate sensory tissue (antennae, legs, mouthparts), sex (male female), life stage (unmated mated female butterflies). Our results untangle potential in establishing barriers identify strong candidate mate host plant choice Of 252 genes, HmOBP20 (involved volatile detection) HmGr56 (a putative synephrine-related receptor) emerge candidates divergence pheromone detection discrimination, respectively. two not physically linked wing-color pattern loci or other regions visual preference. Altogether, our evidence between H. cydno, rarely hybridizing butterflies distinct preferences, finding that supports polygenic boundaries.

Language: Английский

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Extensive Linkage and Genetic Coupling of Song and Preference Loci Underlying Rapid Speciation inLaupalaCrickets

Journal of Heredity, Journal Year: 2021, Volume and Issue: 112(2), P. 204 - 213

Published: Jan. 13, 2021

Abstract In nature, closely related species commonly display divergent mating behaviors, suggesting a central role for such traits in the origin of species. Elucidating genetic basis divergence these is necessary to understand evolutionary process leading reproductive barriers and speciation. The rapidly speciating Hawaiian crickets genus Laupala provides an ideal system dissecting behavior divergence. Laupala, differ markedly male song pulse rate female preference rate. These behaviors play important determining patterns. Previous studies identified architecture consisting numerous small moderate effect loci causing interspecific differences preference, including colocalizing QTL on linkage group one (LG1). To further interrogate QTL, we conduct fine mapping study using high-density SNP maps. With improved statistical power map resolution, provide robust evidence coupling between along with two additional LG1, revealing more resolved picture underlying Our sequence-based map, dramatically narrowed confidence intervals, allowed us annotate genes within regions identify several exciting candidate variation Such knowledge suggests potential molecular mechanisms evolution behavioral barriers.

Language: Английский

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Drift and Directional Selection Are the Evolutionary Forces Driving Gene Expression Divergence in Eye and Brain Tissue ofHeliconiusButterflies

Genetics, Journal Year: 2019, Volume and Issue: 213(2), P. 581 - 594

Published: Aug. 30, 2019

Investigating gene expression evolution over micro- and macroevolutionary timescales will expand our understanding of the role in adaptation speciation. In this study, we characterized evolutionary forces acting on levels eye brain tissue five

Language: Английский

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Visual mate preference evolution during butterfly speciation is linked to neural processing genes

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Sept. 21, 2020

Abstract Many animal species remain separate not because their individuals fail to produce viable hybrids but they “choose” mate. However, we still know very little of the genetic mechanisms underlying changes in these mate preference behaviours. Heliconius butterflies display bright warning patterns, which also use recognize conspecifics. Here, couple QTL for divergence visual behaviours with population genomic and gene expression analyses neural tissue (central brain, optic lobes ommatidia) across development two sympatric species. Within a region containing 200 genes, identify five genes that are strongly associated divergent preferences. Three have previously been implicated key components signalling (specifically an ionotropic glutamate receptor regucalcins ), overall our candidates suggest shifts behaviour involve integration or processing. This would allow evolution without altering perception wider environment.

Language: Английский

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