Parallel evolution despite low genetic diversity in three-spined sticklebacks

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 291(2020)

Published: April 9, 2024

When populations repeatedly adapt to similar environments they can evolve phenotypes based on shared genetic mechanisms (parallel evolution). The likelihood of parallel evolution is affected by demographic history, as it depends the standing variation source population. three-spined stickleback (

Language: Английский

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Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

Evolution, Journal Year: 2019, Volume and Issue: 73(4), P. 817 - 835

Published: March 11, 2019

Diverging semi‐isolated lineages either meet in narrow clinal hybrid zones, or have a mosaic distribution associated with environmental variation. Intrinsic reproductive isolation is often emphasized the former and local adaptation latter, although both reduce gene flow between groups. Rarely are these two patterns of spatial reported same study system. Here, we report that long‐snouted seahorse Hippocampus guttulatus subdivided into discrete panmictic entities by types zones. Along European Atlantic coasts, northern southern lineage southwest France where they coexist sympatry—i.e., geographical zone—with little hybridization. In Mediterranean Sea, distribution, lagoon‐like marine habitats. A fifth was identified Black Sea. Genetic homogeneity over large scales contrasts maintained sympatry close parapatry at fine scale. high variation locus‐specific introgression rates provides additional evidence partial must be maintaining divergence. We find fixed differences lagoon populations Sea belong to most differentiated SNPs lineages, against genome‐wide pattern structure mostly follow geography. These parallel outlier cluster on single chromosome‐wide island differentiation. Since do not map lagoon‐sea habitat variation, genetic parallelism genomic suggests shared barrier contributes contrasting contexts–i.e., versus ecological. discuss how hotspot differentiation could evolved become space patchy environment

Language: Английский

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Ecological gradients drive insect wing loss and speciation: The role of the alpine treeline

Molecular Ecology, Journal Year: 2019, Volume and Issue: 28(13), P. 3141 - 3150

Published: May 1, 2019

Alpine ecosystems are frequently characterized by an abundance of wing-reduced insect species, but the drivers this biodiversity remain poorly understood. Insect wing reduction in these environments has variously been attributed to altitude, temperature, isolation, habitat stability or decreased size. We used fine-scale ecotypic and genomic analyses, along with broad-scale distributional analyses ecotypes, unravel ecological wing-dimorphic stonefly Zelandoperla fenestrata complex. Altitudinal transects within populations revealed dramatic over very fine spatial scales, tightly linked alpine treeline. Broad biogeographical confirm that treeline a much stronger effect on ecotype distributions than altitude per se. Molecular parallel divergence between vestigial-winged (high altitude) full-winged (low ecotypes across distinct streams. These data thus highlight role as key driver rapid speciation, providing new model for diversification exposure gradients.

Language: Английский

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Model‐based demographic inference of introgression history in European whitefish species pairs'

Journal of Evolutionary Biology, Journal Year: 2019, Volume and Issue: 32(8), P. 806 - 817

Published: May 1, 2019

Parallel phenotypic differentiation is generally attributed to parallel adaptive divergence as an evolutionary response similar environmental contrasts. Such parallelism may actually originate from several scenarios ranging repeated caused by divergent selection a unique event followed gene flow. Reconstructing the history underlying thus fundamental understand relative contribution of demography and on genomic during speciation. In this study, we investigate replicate European whitefish (Coregonus lavaretus), limnetic benthic species pairs two lakes in Norway Switzerland. Demographic models accounting for semi-permeability linked were fitted unfolded joint allele frequency spectrum built genome-wide SNPs compared each other pair. We found strong support model asymmetrical post-glacial secondary contact between glacial lineages all four lakes. Moreover, our results suggest that heterogeneous has been shaped action accelerating lineage sorting allopatry, migration eroding at different rates along genome following contact. Our analyses reveal how interplay demography, historical contingency influenced levels diversity observed previous phylogeographic studies. This study provides new insights into demographic selective processes associated with ecological speciation whitefish.

Language: Английский

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A chromosome‐level assembly of the harlequin ladybird Harmonia axyridis as a genomic resource to study beetle and invasion biology

Molecular Ecology Resources, Journal Year: 2021, Volume and Issue: 21(4), P. 1318 - 1332

Published: Feb. 5, 2021

Abstract The harlequin ladybird, Harmonia axyridis (Pallas), is a well‐known model organism for genetic studies and also well‐studied natural enemy used pest control. It became an invasive species after being introduced to North America Europe as control agent. Though two genome assemblies this insect have been previously reported, high‐quality assembly at the chromosome level still not available. Here, we obtained new chromosome‐level of H . by combining various sequencing technologies, namely Illumina short reads, PacBio long 10X Genomics Hi‐C. 423 Mb with scaffold N50 45.92 Mb. Using Hi‐C data 1,897 scaffolds were anchored eight chromosomes. A total 730,068 repeat sequences identified, making up 51.2% assembled genome. After masking these sequences, annotated 22,810 protein‐encoding genes. X Y‐linked identified resequencing male female genomes calculating coverage ratios. Two gene families associated environmental adaptation, odorant receptor cytochrome P450, analysed showed no obvious expansion in We successfully constructed putative biosynthesis pathway harmonine, defence compound haemolymph , which key factor strong immunity. helpful resource beetle biology biology.

Language: Английский

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