A neglected conceptual problem regarding phenotypic plasticity's role in adaptive evolution: The importance of genetic covariance and social drive

Evolution Letters, Journal Year: 2021, Volume and Issue: 5(5), P. 444 - 457

Published: Aug. 24, 2021

Abstract There is tantalizing evidence that phenotypic plasticity can buffer novel, adaptive genetic variants long enough to permit their evolutionary spread, and this process often invoked in explanations for rapid evolution. However, the strength generality of it controversial. We identify a conceptual problem affecting debate: recombination, segregation, independent assortment are expected quickly sever associations between genes controlling novel adaptations contributing trait facilitates by reducing indirect fitness costs. To make clearer predictions about role facilitating adaptation, we describe testable mechanism resolves problem: covariance new persistence within populations. architectures might lead such covariance, including coupling via physical linkage pleiotropy, illustrate consequences adaptation rates using numerical simulations. Such covariances may also arise from social environment, suggest effects result could further accentuate adaptation. call latter drive, methods test it. promote unusually ‘runaway’ evolution adaptations. The resultant dynamics facilitate rescue, radiations, origin novelties, other commonly studied processes.

Language: Английский

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Acoustic signalling in Orthoptera

Advances in insect physiology, Journal Year: 2021, Volume and Issue: unknown, P. 1 - 99

Published: Jan. 1, 2021

Language: Английский

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Decoupling of sexual signals and their underlying morphology facilitates rapid phenotypic diversification

Evolution Letters, Journal Year: 2022, Volume and Issue: unknown

Published: Dec. 1, 2022

How novel phenotypes evolve is challenging to imagine because traits are often underlain by numerous integrated phenotypic components, and changes any one form can disrupt the function of entire module. Yet do emerge, research on adaptive evolution suggests that complex diverge while either maintaining existing form-function relationships or through innovations alter relationships. these alternate routes contribute sexual signal poorly understood, despite role signals in generating biodiversity. In Hawaiian populations Pacific field cricket, male song attracts both female crickets a deadly acoustically orienting parasitoid fly. response this conflict between natural selection, have evolved altered wing morphologies multiple times, resulting loss dramatic alteration signals. More recently, we others observed radical increase variation underlying morphological structures produce song. We conducted first combined analysis (wing morphology), (emergent signal), receiver responses characterize variation, test alternative hypotheses about (Form-Function Continuity vs. Form-Function Decoupling), investigate mechanistic fitness consequences identified three sound-producing morphs (one previously undescribed, named "rattling") found morphology been rewired rapidly repeatedly, gain, loss, structures, facilitating production exist space. By integrating across hierarchy phenotypes, uncovered divergent with unique solutions challenge attracting mates evading fatal parasitism.

Language: Английский

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Varied female and male courtship behavior facilitated the evolution of a novel sexual signal

Behavioral Ecology, Journal Year: 2022, Volume and Issue: 33(4), P. 859 - 867

Published: May 2, 2022

Abstract Sexual selection can contribute to speciation when signals and preferences expressed during mate choice are coupled within groups, but come differ across groups (generating assortative mating). When new sexual evolve, it is important investigate their roles in both location courtship contexts, as signaling functions critical choice. In previous work, researchers identified two male morphs (silent purring) Hawaiian populations of the Pacific field cricket, Teleogryllus oceanicus. These likely evolved because they protect males from an acoustically orienting parasitoid, yet still obtain some reproductive success. But, remains unknown how purring morph close encounters. We compared relative success very recently that ancestral silent Purring produce a novel song were not successful type, mounted by females often quickly obligately arose spread ~20 years ago. initiate more than other morphs, where common exhibit higher overall mounting rates. Thus, differences behavior may have facilitated origin this signal. found no mating between given own population, so we hypothesize multiple types will be maintained species each achieves fitness different ways.

Language: Английский

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Testing the genomic overlap between intraspecific mating traits and interspecific mating barriers

Evolution Letters, Journal Year: 2024, Volume and Issue: 8(6), P. 902 - 915

Published: Aug. 14, 2024

Abstract Differences in interspecific mating traits, such as male sexual signals and female preferences, often evolve quickly initial barriers to gene flow between nascent lineages, they may also strengthen during secondary contact via reinforcement. However, it is an open question whether loci contributing intraspecific variation traits are co-opted the formation strengthening of species. To test this, we used a population genomics approach natural populations Australian cricket sister species that overlap zone: Teleogryllus oceanicus commodus. First, identified associated with T. signals: advertisement song cuticular hydrocarbon (CHC) pheromones. We then separately candidate barrier Genes showing elevated allelic divergence were enriched for neurological functions, indicating potential behavioral rewiring. Only two CHC-associated genes overlapped these loci, CHC showed signatures being under strong selective constraints In contrast, 10 song-associated high genetic differentiation commodus oceanicus, 2 had genomic divergence. The overall lack shared intra vs. comparisons trait consistent limited co-option architecture establishment maintenance reproductive isolation.

Language: Английский

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