Multifarious selection through environmental change: acidity and predator-mediated adaptive divergence in the moor frog (<i>Rana arvalis</i>)

Egea‐Serrano, Andrés; Hangartner, Sandra; Laurila, Anssi; Räsänen, Katja

doi:10.1098/rspb.2013.3266

Cited by 31 publications

(54 citation statements)

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“…; Egea‐Serrano et al . ). When selection acts on many loci, the combined effect of divergent selection can drive a global reduction in effective gene flow, thus favouring the establishment of new mutations and leading to ‘genome hitchhiking’ (Feder & Nosil ; Feder et al .…”

Section: Discussionmentioning

confidence: 97%

Rapid postglacial diversification and long‐term stasis within the songbird genus Junco: phylogeographic and phylogenomic evidence

et al. 2016

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Natural systems composed of closely related taxa that vary in the degree of phenotypic divergence and geographic isolation provide an opportunity to investigate the rate of phenotypic diversification and the relative roles of selection and drift in driving lineage formation. The genus Junco (Aves: Emberizidae) of North America includes parapatric northern forms that are markedly divergent in plumage pattern and colour, in contrast to geographically isolated southern populations in remote areas that show moderate phenotypic divergence. Here, we quantify patterns of phenotypic divergence in morphology and plumage colour and use mitochondrial DNA genes, a nuclear intron, and genomewide SNPs to reconstruct the demographic and evolutionary history of the genus to infer relative rates of evolutionary divergence among lineages. We found that geographically isolated populations have evolved independently for hundreds of thousands of years despite little differentiation in phenotype, in sharp contrast to phenotypically diverse northern forms, which have diversified within the last few thousand years as a result of the rapid postglacial recolonization of North America. SNP data resolved young northern lineages into reciprocally monophyletic lineages, indicating low rates of gene flow even among closely related parapatric forms, and suggesting a role for strong genetic drift or multifarious selection acting on multiple loci in driving lineage divergence. Juncos represent a compelling example of speciation in action, where the combined effects of historical and selective factors have produced one of the fastest cases of speciation known in vertebrates.

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Section: Discussionmentioning

confidence: 97%

Rapid postglacial diversification and long‐term stasis within the songbird genus Junco: phylogeographic and phylogenomic evidence

et al. 2016

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“…; Egea‐Serrano et al . ). But this too would likely degrade MCMC mixing and thus complicate the analysis.…”

Section: Discussionmentioning

confidence: 97%

Bayesian inference of selection in a heterogeneous environment from genetic time‐series data

Gompert

2015

Molecular Ecology

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Evolutionary geneticists have sought to characterize the causes and molecular targets of selection in natural populations for many years. Although this research programme has been somewhat successful, most statistical methods employed were designed to detect consistent, weak to moderate selection. In contrast, phenotypic studies in nature show that selection varies in time and that individual bouts of selection can be strong. Measurements of the genomic consequences of such fluctuating selection could help test and refine hypotheses concerning the causes of ecological specialization and the maintenance of genetic variation in populations. Herein, I proposed a Bayesian nonhomogeneous hidden Markov model to estimate effective population sizes and quantify variable selection in heterogeneous environments from genetic time-series data. The model is described and then evaluated using a series of simulated data, including cases where selection occurs on a trait with a simple or polygenic molecular basis. The proposed method accurately distinguished neutral loci from non-neutral loci under strong selection, but not from those under weak selection. Selection coefficients were accurately estimated when selection was constant or when the fitness values of genotypes varied linearly with the environment, but these estimates were less accurate when fitness was polygenic or the relationship between the environment and the fitness of genotypes was nonlinear. Past studies of temporal evolutionary dynamics in laboratory populations have been remarkably successful. The proposed method makes similar analyses of genetic time-series data from natural populations more feasible and thereby could help answer fundamental questions about the causes and consequences of evolution in the wild.

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“…; Egea‐Serrano et al . ), while R. temporaria is less well studied but shows adaptive divergence in embryonic acid tolerance (Glos et al . ; Brunold ).…”

Section: Methodsmentioning

confidence: 99%

Molecular phenotyping of maternally mediated parallel adaptive divergence withinRana arvalisandRana temporaria

et al. 2016

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When similar selection acts on the same traits in multiple species or populations, parallel evolution can result in similar phenotypic changes, yet the underlying molecular architecture of parallel phenotypic divergence can be variable. Maternal effects can influence evolution at ecological timescales and facilitate local adaptation, but their contribution to parallel adaptive divergence is unclear. In this study, we (i) tested for variation in embryonic acid tolerance in a common garden experiment and (ii) used molecular phenotyping of egg coats to investigate the molecular basis of maternally mediated parallel adaptive divergence in two amphibian species (Rana arvalis and Rana temporaria). Our results on three R. arvalis and two R. temporaria populations show that adaptive divergence in embryonic acid tolerance is mediated via maternally derived egg coats in both species. We find extensive polymorphism in egg jelly coat glycoproteins within both species and that acid-tolerant clutches have more negatively charged egg jelly - indicating that the glycosylation status of the jelly coat proteins is under divergent selection in acidified environments, likely due to its impact on jelly water balance. Overall, these data provide evidence for parallel mechanisms of adaptive divergence in two species. Our study highlights the importance of studying intraspecific molecular variation in egg coats and, specifically, their glycoproteins, to increase understanding of underlying forces maintaining variation in jelly coats.

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Multifarious selection through environmental change: acidity and predator-mediated adaptive divergence in the moor frog (Rana arvalis)

Cited by 31 publications

References 50 publications

Rapid postglacial diversification and long‐term stasis within the songbird genus Junco: phylogeographic and phylogenomic evidence

Rapid postglacial diversification and long‐term stasis within the songbird genus Junco: phylogeographic and phylogenomic evidence

Bayesian inference of selection in a heterogeneous environment from genetic time‐series data

Molecular phenotyping of maternally mediated parallel adaptive divergence withinRana arvalisandRana temporaria

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