Volcanic events coincide with plant dispersal across the Northern Andes

Global and Planetary Change, Год журнала: 2022, Номер 210, С. 103757 - 103757

Опубликована: Фев. 5, 2022

Язык: Английский

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The interaction of resource use and gene flow on the phenotypic divergence of benthic and pelagic morphs of Icelandic Arctic charr (Salvelinus alpinus)

Ecology and Evolution, Год журнала: 2021, Номер 11(12), С. 7315 - 7334

Опубликована: Май 2, 2021

Conceptual models of adaptive divergence and ecological speciation in sympatry predict differential resource use, phenotype-environment correlations, reduced gene flow among diverging phenotypes. While these predictions have been assessed past studies, connections them rarely collectively. We examined relationships phenotypic, ecological, genetic variation Arctic charr (Salvelinus alpinus) from six Icelandic localities that undergone varying degrees into sympatric benthic pelagic morphs. characterized morphological with geometric morphometrics, tested for use between morphs using stable isotopes, inferred the amount single nucleotide polymorphisms. Analysis isotopic signatures indicated showed similar difference across populations, likely arising common utilization niche space within each population. Carbon signature was also a significant predictor individual body shape size, suggesting is associated phenotypic variation. The estimated percentage hybrids varied populations (from 0% to 15.6%) but majority fish had genotypes (ancestry coefficients) characteristic pure Despite evidence morphs, we did not detect expected negative relationship flow. Three lakes pattern, fourth no detectable hybridization relatively low differences them. This coupled finding differentiation effects on suggests reproductive isolation maintains when are low. Our ability assess phenotype, ecology, genetics deepens our understanding processes underlying sympatry.

Язык: Английский

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Speciation in Cisco with Emphasis on Secondary Contacts, Plasticity, and Hybridization

Transactions of the American Fisheries Society, Год журнала: 2020, Номер 149(6), С. 721 - 740

Опубликована: Авг. 28, 2020

Abstract The Cisco Coregonus artedi is a planktivorous fish that widely distributed in lakes across glaciated areas of North America. With retreat Laurentide ice, dispersed from refugia into vast network meltwater (proglacial) eventually receded, stranding populations depressions—today’s lakes. Refugial also colonized fell outside the footprint proglacial lake. These two types lakes, those inside lake and footprint, though uncounted, number high hundreds or more. All 53 reported to contain sympatric forms occur previously inundated lakes; no were not inundated. We reviewed zoogeography assess whether secondary contacts extensive enough account for distribution concluded had been more than detected genetic studies Cisco. inferred resulted plastic, diverse phenotypes found these capable divergence inhabiting Secondary appear have limited shallow‐water Deepwater likely did evolve until after as appears trophically unsuitable pelagic fishes like are assumed by “hopscotching” between inlets, thereby avoiding prolonged existence meltwater. Sympatric rare comparison with allopatric populations, even indicating occurs under specialized conditions. Canalization diminished evolvability contemporary compared their ancestors. Hybridization within species pairs be norm aggravated anthropogenically induced events.

Язык: Английский

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Epigenetic and Genetic Differentiation Between Coregonus Species Pairs

Genome Biology and Evolution, Год журнала: 2024, Номер 16(2)

Опубликована: Янв. 25, 2024

Abstract Phenotypic diversification is classically associated with genetic differentiation and gene expression variation. However, increasing evidence suggests that DNA methylation involved in evolutionary processes due to its phenotypic transcriptional effects. Methylation can increase mutagenesis could lead increased divergence between populations experiencing different environmental conditions for many generations, though there has been minimal empirical research on epigenetically induced speciation. Whitefish, freshwater members of the salmonid family, are excellent systems study speciation repeated benthic–limnetic species pairs serving as natural replicates. Here we investigate whole genome epigenetic sympatric lake European whitefish (Coregonus clupeaformis Coregonus lavaretus) from four lakes (N = 64). We found considerable, albeit variable, differences pairs. All SNP types were enriched at CpG sites supporting mutagenic nature methylation, C>T SNPs most common. also an enrichment overlaps outlier 5% highest FST differentially methylated loci. This possibly represent have caused divergent mutations species, or selection leading both variation these sites. Our results support hypothesis contributes during

Язык: Английский

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Testing the radiation cascade in postglacial radiations of whitefish and their parasites: founder events and host ecology drive parasite evolution

Evolution Letters, Год журнала: 2024, Номер 8(5), С. 706 - 718

Опубликована: Июнь 19, 2024

Reciprocal effects of adaptive radiations on the evolution interspecific interactions, like parasitism, remain barely explored. We test whether recent European whitefish (

Язык: Английский

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Biases in demographic modelling affect our understanding of recent divergence

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2020, Номер unknown

Опубликована: Июнь 5, 2020

Abstract Testing among competing demographic models of divergence has become an important component evolutionary research in model and non-model organisms. However, the effect unaccounted events on choice parameter estimation remains largely unexplored. Using extensive simulations, we demonstrate that under realistic scenarios, failure to account for population size ( N e ) changes daughter ancestral populations leads strong biases time estimates as well choice. We illustrate these issues reconstructing recent history North Sea Baltic turbots Schopthalmus maximus by testing 16 Isolation with Migration (IM) Secondary Contact (SC) modelling effects linked selection barrier loci. Failure resulted selecting SC long periods isolation times preceding formation Sea. In contrast, accounting suggest (<6 kya) constant gene flow. further show how interpreting genomic landscapes differentiation can help discerning models. For example, data islands signatures selective sweeps, rather than old resisting secondary introgression. The results have broad implications study high-lighting potential unmodeleld inference. Tested should aim at representing scenarios target taxa, extreme caution always be exercised when modelling.

Язык: Английский

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Chromosomal rearrangements preserve adaptive divergence in ecological speciation

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2021, Номер unknown

Опубликована: Авг. 21, 2021

Abstract Despite increasing empirical evidence that chromosomal rearrangements may play an important role in adaptive divergence and speciation, the degree to which divergent genomic regions are associated with remains unclear. In this study, we provide first whole-genome analyses of ecological speciation evolution a Daphnia species complex, using chromosome-scale assemblies natural-population sequencing recently diverged pair, pulicaria pulex , occupy distinct yet overlapping habitats North America, outgroup obtusa . Our results describe mixed mode geographic (isolation secondary contact) resulting heterogeneous landscape divergence. Large contiguous “continents divergence” encompass over one third genome (36%) contain nearly all fixed differences (94%) between species, while background has been homogenized. Chromosomal including inversions intrachromosomal translocations, continents capture multiple alleles genes pathways thought contribute species’ phenotypic differences.

Язык: Английский

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Complex and divergent histories gave rise to genome‐wide divergence patterns amongst European whitefish (Coregonus lavaretus)

Journal of Evolutionary Biology, Год журнала: 2021, Номер 34(12), С. 1954 - 1969

Опубликована: Окт. 17, 2021

Pleistocene glaciations dramatically affected species distribution in regions that were impacted by ice cover and subsequent postglacial range expansion contemporary biodiversity complex ways. The European whitefish, Coregonus lavaretus, is a widely distributed salmonid fish on mainland Europe, but Britain it has only seven native populations, all of which are found the western extremes island. origins colonization routes into unknown likely contributed to genetic patterns regional uniqueness. Here, we used up 25,751 genome-wide polymorphic loci reconstruct history discern demographic evolutionary forces underpinning divergence between British populations. Overall, lower diversity Scottish populations high differentiation (FST = 0.433-0.712) from English/Welsh other Differentiation was elevated rather than particular genomic regions. Demographic modelling supported Scotland northern refugia separate route for southern refugia, with these two groups having been separated more ca. 50 Ky. We cyto-nuclear discordance at scale, clustering closely Baltic population mtDNA analysis not nuclear data, Norwegian Alpine displaying same haplotype being distantly related tree. These findings suggest neutral processes, primarily drift regionally distinct pre-glacial histories, important drivers whitefish. This sheds new light establishment freshwater fauna after last glacial maximum.

Язык: Английский

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Genetic relationships between sympatric and allopatric Coregonus ciscoes in North and Central Europe

BMC Ecology and Evolution, Год журнала: 2021, Номер 21(1)

Опубликована: Окт. 6, 2021

Abstract Background Sympatric speciation along ecological gradients has been studied repeatedly, in particular freshwater fishes. Rapid post-glacial divergence resulted numerous endemic species or ecologically distinct populations lakes of the temperate zones. Here, we focus on Baltic cisco ( Coregonus albula ) complex, to study genetic similarity among two pairs sympatric autumn- and spring-spawning from German Lakes Stechlin Breiter Luzin. For comparison, included a similar pair Swedish Lake Fegen. We wanted explore potential similarities between three population lakes, evaluate whether may have emerged independently different colonized all independently. Furthermore, considered allopatric C. Polish, Finnish, four locations, added one Siberian sister sardinella maraena (whitefish) population. By genotyping nine microsatellite markers 655 individuals these 18 populations, elucidate how strongly differ across larger geographical area within Europe. Finally, compared differences spring- autumn-spawning ciscoes infer potentially deteriorating effect strong anthropogenic pressure lakes. Results Dendrogram, Principal Coordinate Analysis admixture analysis indicated correspondence differentiation location for most Europe, including . However, some deviated this general pattern, by showing structure. found evidence independent evolution pairs, because co-occurring same lake were always closely related. was weak but Fegen, indicating that reported earlier eroded further. Conclusions Our results suggest at neutral complex evolved (and is maintained) random drift isolated populations. studies combining mitochondrial DNA data indicate also immigration separate glacial refugia shaped present The low contrast suggests recent effects Germany put spring-spawners risk extinction.

Язык: Английский

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Coupling of 12 chromosomal inversions maintains a strong barrier to gene flow between ecotypes

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Сен. 20, 2023

Abstract Chromosomal rearrangements lead to the coupling of reproductive barriers, but whether and how they contribute completion speciation remains unclear. Marine snails genus Littorina repeatedly form hybrid zones between taxa segregating for inversion arrangements, providing opportunities study this question. Here, we analysed two adjacent transects across large dwarf ecotypes fabalis covering wave exposure gradients in a Swedish island. Applying whole-genome sequences found 12 putative inversions reaching near differential fixation opposite ends each transect, being strong linkage disequilibrium. These cover 20% genome carry 93% divergent SNPs. Bimodal both indicate that maintain their genetic phenotypic integrity following contact due clines strengthened barrier. The bimodality resulting from linked extends into collinear parts genome, suggesting genome-wide coupling. Demographic inference suggests built up during period allopatry, has been maintained more than 1K generations after secondary contact. Overall, shows multiple chromosomal contributes isolation. Importantly, overlap with inverted genomic regions associated ecotype differences closely-related species ( L. saxatilis ), same regions, similar structural variants, evolution distinct species.

Язык: Английский

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