Speciation across biomes: Rapid diversification with reproductive isolation in the Australian delicate mice

Molecular Ecology, Год журнала: 2024, Номер 33(7)

Опубликована: Фев. 22, 2024

Phylogeographic studies of continental clades, especially when combined with palaeoclimate modelling, provide powerful insight into how environment drives speciation across climatic contexts. Australia, a continent characterized by disparate modern biomes and dynamic climate change, provides diverse opportunity to reconstruct the impact past present environments on diversification. Here, we use genomic-scale data (1310 exons whole mitogenomes from 111 samples) investigate Pleistocene diversification, cryptic diversity, secondary contact in Australian delicate mice (Hydromyini: Pseudomys), recent radiation spanning almost all environments. Across northern find no evidence for introgression between lineages within Pseudomys delicatulus sensu lato, models supporting contraction expansion suitable habitat since last glacial maximum. Despite multiple zones, also little at scale, exception potential hybrid zone mesic biome. In arid zone, insights genetic palaeomodels support specialist P. hermannsburgensis semi-arid bolami. face repeated contact, differences sperm morphology chromosomal rearrangements are mechanisms that maintain species boundaries these recently diverged species. Additionally, describe western mouse as new recommend taxonomic reinstatement eastern mouse. Overall, show an evolutionarily young widespread clade has been driven environmental potentially maintained divergence reproductive chromosome rearrangements.

Язык: Английский

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Synthesis and Scope of the Role of Postmating Prezygotic Isolation in Speciation

Cold Spring Harbor Perspectives in Biology, Год журнала: 2023, Номер 16(10), С. a041429 - a041429

Опубликована: Дек. 27, 2023

How barriers to gene flow arise and are maintained key questions in evolutionary biology. Speciation research has mainly focused on that occur either before mating or after zygote formation. In comparison, postmating prezygotic (PMPZ) isolation-a barrier acts gamete release but formation-is less frequently investigated may hold a unique role generating biodiversity. Here we discuss the distinctive features of PMPZ isolation, including primary drivers molecular mechanisms underpinning isolation. We then present first comprehensive survey isolation research, revealing it is widespread form across eukaryotes. The also exposes obstacles studying part attributable challenges involved directly measuring uncovering its causal mechanisms. Finally, identify outstanding knowledge gaps provide recommendations for improving future This will allow us better understand nature this often-neglected reproductive contribution speciation.

Язык: Английский

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Evolutionary dynamics of pre- and postzygotic reproductive isolation in cichlid fishes

Philosophical Transactions of the Royal Society B Biological Sciences, Год журнала: 2020, Номер 375(1806), С. 20190535 - 20190535

Опубликована: Июль 12, 2020

Cichlid fishes are exceptionally species-rich, speciated at explosive rates and, hence, a model system in speciation research. Yet, their reproductive isolating barriers have, so far, not been comprehensively studied. Here, we review current knowledge on pre- and postzygotic mechanisms cichlids. While premating isolation is the norm cichlids, its strength varies across lineages with geographical setting. Moreover, manipulations of ambient conditions tended to reduce assortative mating among closely related species, suggesting that cichlids often fragile context dependent. The observed lack complete supported by past present hybridization events have contributed diversity creating novel allelic combinations. On other hand, our meta-analysis highlights intrinsic might accumulate faster than assumed. Mild forms genetic incompatibilities, such as sex ratio distortion, can already be species. Therefore, cessation gene flow strong requires combination prezygotic supplemented extrinsic barriers. Further, suggest crucial next steps improve about understand evolutionary dynamics during adaptive radiations. This article part theme issue ‘Towards completion speciation: evolution beyond first barriers'.

Язык: Английский

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Rapid gene content turnover on the germline-restricted chromosome in songbirds

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Июль 29, 2023

The germline-restricted chromosome (GRC) of songbirds represents a taxonomically widespread example programmed DNA elimination. Despite its apparent indispensability, we still know very little about the GRC's genetic composition, function, and evolutionary significance. Here assemble GRC in two closely related species, common thrush nightingale. In total identify 192 genes across GRCs, with many them present multiple copies. Interestingly, appears to be under selective pressure, content differing dramatically between species appearing pseudogenized fragments. Only one gene, cpeb1, has complete coding region all examined individuals shows no copy number variation. acquisition this gene by corresponds earliest estimates origin, making it good candidate for functional indispensability songbirds.

Язык: Английский

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Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances

Evolution, Год журнала: 2019, Номер 73(6), С. 1182 - 1199

Опубликована: Апрель 8, 2019

The impact of different reproductive barriers on species or population isolation may vary in stages speciation depending evolutionary forces acting within and through species' interactions. Genetic incompatibilities between interacting are expected to reinforce prezygotic sympatric populations lead cascade reinforcement conspecific living outside the areas sympatry. We tested these predictions studied whether how strength target Drosophila montana flavomontana with histories abundances. All D. females males were nearly complete, while reciprocal cross strong postzygotic was accompanied by whose varied according composition. Sexual increased long‐established populations, where is abundant, postmating (PMPZ) stronger this a new invader still rare female discrimination against heterospecific lower. Strengthening sexual PMPZ also induced respective which classic signature process.

Язык: Английский

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Comparison of Karyotypes in Two Hybridizing Passerine Species: Conserved Chromosomal Structure but Divergence in Centromeric Repeats

Frontiers in Genetics, Год журнала: 2021, Номер 12

Опубликована: Дек. 6, 2021

Changes in chromosomal structure involving rearrangements or copy number variation of specific sequences can play an important role speciation. Here, we explored the two hybridizing passerine species; common nightingale ( Luscinia megarhynchos ) and thrush luscinia ), using conventional cytogenetic approaches, immunostaining meiotic chromosomes, fluorescence situ hybridization as well comparative genomic (CGH). We found that species show conserved karyotypes with same diploid chromosome 2n = 84. In addition to standard both possessed a small germline restricted similar size microchromosome. Just few subtle changes morphology were observed between species, suggesting only limited occurred after divergence. The interspecific CGH experiment suggested might have diverged centromeric repetitive most macro- microchromosomes. addition, some chromosomes showed repeats species. observation very is consistent generally slow rate karyotype evolution birds. divergence could theoretically cause drive reduced fertility hybrids. Nevertheless, further studies are needed evaluate potential structural variations

Язык: Английский

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Longer Sperm Swim More Slowly in the Canary Islands Chiffchaff

Cells, Год журнала: 2021, Номер 10(6), С. 1358 - 1358

Опубликована: Май 31, 2021

Sperm swimming performance affects male fertilization success, particularly in species with high sperm competition. Understanding how morphology impacts is therefore important. speed hypothesized to increase total length, relative flagellum length (with the generating forward thrust), and midpiece (as contains mitochondria). We tested these hypotheses for divergence traits five island populations of Canary Islands chiffchaff (Phylloscopus canariensis). confirmed incipient mitochondrial DNA differentiation between Gran Canaria other islands. correlated negatively did not correlate (for only). The proportion motile cells increased on only. was similar across thus add a growing number studies passerine birds that do support morphology–swimming hypotheses. suggest mechanics are sufficiently different from mammalian predictions hydrodynamic models should no longer be applied this taxon. While both likely under selection passerines, relationship them requires further elucidation.

Язык: Английский

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Germline-restricted chromosome shows remarkable variation in size among closely related passerine species

Chromosoma, Год журнала: 2022, Номер 131(1-2), С. 77 - 86

Опубликована: Апрель 7, 2022

Язык: Английский

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Tracing the early steps of competition-driven eco-morphological divergence in two sister species of passerines

Evolutionary Ecology, Год журнала: 2020, Номер 34(4), С. 501 - 524

Опубликована: Май 16, 2020

Язык: Английский

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Sperm as a speciation phenotype in promiscuous songbirds

Evolution, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 1, 2024

Abstract Sperm morphology varies considerably among species. traits may contribute to speciation if they diverge fast in allopatry and cause conspecific sperm precedence upon secondary contact. However, their role driving prezygotic isolation has been poorly investigated. Here we test the hypothesis that, early process, female promiscuity promotes a reduction overlap length distributions songbird populations. We assembled data set of 20 pairs populations with known distributions, published estimate divergence time, an index derived from extrapair paternity rates or relative testis size. found that diverged more rapidly promiscuous Faster between was caused by lower variance trait species, not faster mean lengths. The reduced is presumably due stronger stabilizing selection on mediated competition. If divergent optima causes sympatry, which remains be shown empirically, promote isolation, rapid songbirds.

Язык: Английский

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