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64 results for “reproductive barriers”
Data from: Wolbachia and host intrinsic reproductive barriers contribute additively to post-mating isolation in spider mites
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Data from: Multiple strong postmating and intrinsic postzygotic reproductive barriers isolate florally diverse species of Jaltomata (Solanaceae)
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Data from: Both morph- and species-dependent asymmetries affect reproductive barriers between heterostylous species
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Data from: Testing a post-copulatory pre-zygotic reproductive barrier in a passerine species pair
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Intraspecific genetic variation underlying postmating reproductive barriers between species in the wild tomato clade (Solanum sect. Lycopersicon)
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Data from: Diverse reproductive barriers in hybridising crickets suggests extensive variation in the evolution and maintenance of isolation
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Reproductive barriers and genomic hotspots of adaptation during allopatric species divergence: datasets for all phylogenetic reconstructions represented in Fig 2
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Data from: Genetic architecture of traits associated with reproductive barriers in Silene: coupling, sex chromosomes and variation
The evolution of reproductive barriers and their underlying genetic architecture is of central importance for the formation of new species. Reproductive barriers can be controlled either by few large-effect loci suggesting strong selection on key traits, or by many small-effect loci, consistent with gradual divergence or with selection on polygenic or multiple traits. Genetic coupling between reproductive barrier loci further promotes divergence, particularly divergence with ongoing gene flow. In this study, we investigated the genetic architectures of ten morphological, phenological and life history traits associated with reproductive barriers between the hybridizing sister species Silene dioica and S. latifolia; both are dioecious with XY sex determination. We used quantitative trait locus (QTL) mapping in two reciprocal F2 crosses. One to six QTLs per trait, including 9 major QTLs (PVE > 20%) were detected, in total, on 11 of 12 linkage groups. We found strong evidence for coupling of QTLs for uncorrelated traits. QTL clusters occurred both on autosomes and on the sex chromosomes. Unexpectedly, QTLs detected in the two F2 crosses differed largely, despite limited phenotypic differences between them and sufficient statistical power. The widely dispersed genetic architectures of traits associated with reproductive barriers suggest gradual divergence or multifarious selection and coupling of the underlying QTLs likely promoted divergence with gene flow in this system. The low congruence of QTLs between the two crosses further points to variable and possibly redundant genetic architectures of traits associated with reproductive barriers, with important implications for the evolutionary dynamics of divergence and speciation.
Data from: Strength and variability of postmating reproductive isolating barriers between four European white oak species
The identification and quantification of the relative importance of reproductive isolating barriers is of fundamental importance to understand species maintenance in the face of interspecific gene flow between hybridizing species. Yet, such assessments require extensive experimental fertilisations that are particularly difficult when dealing with more than two hybridizing and long generation time species such as oaks. Here we quantify the relative contribution of four postmating reproductive isolating barriers consisting of two prezygotic barriers (gametic incompatibility, conspecific pollen precedence) and two postzygotic barriers (germination rate, early survival) from extensive controlled pollinations between four oak species (Quercus robur, Q. petraea, Q. pubescens and Q. pyrenaica) that have been shown to frequently hybridize in natural populations. We found high variation in the strength of total reproductive isolation between species, ranging from total reproductive isolation to advantage toward hybrid formation. As previously found, Q. robur pollen was unable to fertilize Q. petraea due to a strong reproductive isolating mechanism. On the contrary, Q. pubescens pollen was more efficient at fertilizing Q. petraea than conspecific pollen. Overall, prezygotic barriers contribute far more than postzygotic barriers to isolate species reproductively, suggesting a role for reinforcement in the development of prezygotic barriers. Conspecific pollen precedence reduced hybrid formation when pollen competition was allowed, however presence of conspecific pollen did not totally prevent hybridization. Our results suggest that pollen competition depends on multiple ecological and environmental parameters, including species local abundance, and that it may be of uppermost importance to understand interspecific gene flow among natural multispecies populations.
Data from: Patterns of reproductive isolation in a haplodiploid – strong post‐mating, prezygotic barriers among three forms of a social spider mite
In speciation research, much attention is paid to the evolution of reproductive barriers, preventing diverging groups from hybridizing back into one gene pool. The prevalent view is that reproductive barriers evolve gradually as a byproduct of genetic changes accumulated by natural selection and genetic drift in groups that are segregated spatially and/or temporally. Reproductive barriers, however, can also be reinforced by natural selection against maladaptive hybridization. These mutually compatible theories are both empirically supported by studies, analyzing relationships between intensity of reproductive isolation and genetic distance in sympatric taxa and allopatric taxa. Here, we present the – to our knowledge – first comparative study in a haplodiploid organism, the social spider mite Stigmaeopsis miscanthi, by measuring premating and postmating pre- and postzygotic components of reproductive isolation, using three recently diverged forms of the mite that partly overlap in home range. We carried out cross experiments and measured genetic distances (mtDNA and nDNA) among parapatric and allopatric populations of the three forms. Our results show that the three forms are reproductively isolated, despite the absence of premating barriers, and that the postmating, prezygotic component contributes most to reproductive isolation. As expected, the strength of postmating reproductive barriers positively correlated with genetic distance. We did not find a clear pattern of prezygotic barriers evolving faster in parapatry than in allopatry, although one form did show a trend in line with the ecological and behavioral relationships between the forms. Our study advocates the versatility of haplodiploid animals for investigating the evolution of reproductive barriers.
Genomic divergence in sympatry indicates strong reproductive barriers and cryptic species within Eucalyptus salubris
Genetic studies are increasingly detecting cryptic taxa that likely represent a significant component of global biodiversity. However, cryptic taxa are often criticized because they are typically detected serendipitously and may not receive the follow-up study required to verify their geographic or evolutionary limits. Here, we follow-up a study of Eucalyptus salubris that unexpectedly detected two divergent lineages but was not sampled sufficiently to make clear interpretations. We undertook comprehensive sampling for an independent genomic analysis (3,605 SNPs) to investigate whether the two purported lineages remain discrete genetic entities or if they intergrade throughout the species' range. We also assessed morphological and ecological traits, and sequenced chloroplast DNA. SNP results showed strong genome-wide divergence (FST=0.252) between two discrete lineages: one dominated the north and one the southern regions of the species' range. Within lineages gene flow was high, with low differentiation (mean FST=0.056) spanning hundreds of kilometres. In the central region, the lineages were interspersed but maintained their genomic distinctiveness: an indirect demonstration of reproductive isolation. Populations of the southern lineage exhibited significantly lower specific leaf area and occurred on soils with lower phosphorus relative to the northern lineage. Finally, two major chloroplast haplotypes were associated with each lineage but were shared between lineages in the central distribution. Together, these results suggest that these lineages have non-contemporary origins and that ecotypic adaptive processes strengthened their divergence more recently. We conclude that these lineages warrant taxonomic recognition as separate species and provide fascinating insight to eucalypt speciation.
Data from: Patterns of reproductive isolation in a haplodiploid – strong post‐mating, prezygotic barriers among three forms of a social spider mite
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Data from: Chromosomal rearrangements and the genetics of reproductive barriers in Mimulus (monkeyflowers)
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Data from: Genetic architecture of traits associated with reproductive barriers in Silene: coupling, sex chromosomes and variation
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Genomic divergence in sympatry indicates strong reproductive barriers and cryptic species within Eucalyptus salubris
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Reproductive systems and low outbreeding barriers between Jacaranda cuspidifolia and J. mimosifolia (Jacarandeae, Bignoniaceae)
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Data from: Strength and variability of postmating reproductive isolating barriers between four European white oak species
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The contribution of multiple barriers to reproduction between edaphically divergent lineages in the Amazonian tree Protium subserratum (Burseraceae).
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Chemically-induced epimutagenesis allows bypassing reproductive barriers in hybrid seeds [RNA-seq]
GEO Series GSE179697. Arabidopsis thaliana. 14 samples. Type: Expression profiling by high throughput sequencing.
Dissection of uniparental reproduction barriers in mice using haploid embryonic stem cells [RRBS]
GEO Series GSE120036. Mus musculus. 12 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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