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57 results for “Barriers to gene flow”
Data from: Contemporary human-altered landscapes and oceanic barriers limit bumble bee gene flow
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Data from: Hybrid speciation in sparrows I: phenotypic intermediacy, genetic admixture and barriers to gene flow
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Data from: Genome divergence and the genetic architecture of barriers to gene flow between Lycaeides idas and L. melissa
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Data from: The Pillars of Hercules as a bathymetric barrier to gene-flow promoting isolation in a global deep-sea shark (Centroscymnus coelolepis)
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Data from: Is embryo abortion a postzygotic barrier to gene flow between Littorina ecotypes?
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Data from: Quantification of the zygotic barrier between interbreeding taxa using gene flow data
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Is Niagara Falls a barrier to gene flow in riverine fishes? A test using genome-wide SNP data from seven native species
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Data from: Mating system variation in hybrid zones: facilitation, barriers and asymmetries to gene flow
Plant mating systems play a key role in structuring genetic variation both within and between species. In hybrid zones, the outcomes and dynamics of hybridization are usually interpreted as the balance between gene flow and selection against hybrids. Yet, mating systems can introduce selective forces that alter these expectations; with diverse outcomes for the level and direction of gene flow depending on variation in outcrossing and whether the mating systems of the species pair are the same or divergent. We present a survey of hybridization in 133 species pairs from 41 plant families and examine how patterns of hybridization vary with mating system. We examine if hybrid zone mode, level of gene flow, asymmetries in gene flow and the frequency of reproductive isolating barriers vary in relation to mating system/s of the species pair. We combine these results with a simulation model and examples from the literature to address two general themes: (i) the two-way interaction between introgression and the evolution of reproductive systems, and (ii) how mating system can facilitate or restrict interspecific gene flow. We conclude that examining mating system with hybridization provides unique opportunities to understand divergence and the processes underlying reproductive isolation.
Data from: Sibling competition arena: selfing and a competition arena can combine to constitute a barrier to gene flow in sympatry
Closely-related species coexisting in sympatry provide critical insight into the mechanisms underlying speciation and the maintenance of genetic divergence. Selfing may promote reproductive isolation by facilitating local adaptation, causing reduced hybrid fitness in parental environments. Here, we propose a novel mechanism by which selfing can further impair interspecific gene flow: selfing may act to ensure that non-hybrid progeny systematically co-occur whenever hybrid genotypes are produced. Under a competition arena, the fitness differentials between non-hybrid and hybrid progeny are then magnified, preventing development of interspecific hybrids. We investigate whether this "sibling competition arena" can explain the coexistence in sympatry of closely-related species of the plant fungal pathogens (Microbotryum) causing anther-smut disease. The probabilities of intra-promycelial mating (automixis), outcrossing, and sibling competition were manipulated in artificial inoculations to evaluate their contribution to reproductive isolation. We report that both intra-promycelial selfing and sibling competition significantly reduced rates of hybrid infection beyond that expected based solely upon selfing rates and non-competitive fitness differentials between hybrid and non-hybrid progeny. Our results thus suggest that selfing and a sibling competition arena can combine to constitute a barrier to gene flow and diminish selection for additional barriers to gene flow in sympatry.
Data from: Barriers and corridors of gene flow in an urbanised tropical reef system
<p>Information about the distribution of alleles among marine populations is critical for determining patterns of genetic connectivity that are essential in modern conservation planning. To estimate population connectivity in Singapore's urbanised equatorial reef system, we analysed single nucleotide polymorphisms (SNPs) from two species of reef-building corals with distinct life histories. For <i>Porites </i>sp., a broadcast-spawning coral, we found cryptic lineages which were differentially distributed at inshore and central-offshore sites that could be attributed to contemporary surface current regimes. Near panmixia was observed for <i>Pocillopora acuta</i> with differentiation of colonies at the farthest site from mainland Singapore, a possible consequence of the brooding nature and relatively long pelagic larval duration of the species. Furthermore, analysis of recent gene flow showed that 60-80% of colonies in each population were non-migrants, underscoring self-recruitment as an important demographic process in this reef system. Apart from helping to enhance the management of Singapore's coral reef ecosystems, findings here pave the way for better understanding of the evolution of marine populations in Southeast Asia.</p>
Data from: A simulation–based evaluation of methods for inferring linear barriers to gene flow
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Data from: Barriers and corridors of gene flow in an urbanised tropical reef system
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Data from: Mating system variation in hybrid zones: facilitation, barriers and asymmetries to gene flow
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Data from: Interpreting the genomic landscape of speciation: a road map for finding barriers to gene flow
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Data from: Sibling competition arena: selfing and a competition arena can combine to constitute a barrier to gene flow in sympatry
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Flow upregulates glycocalyx-related genes and makes surface charge more negative of a human blood-brain barrier co-culture model in an organ-on-a-chip device
GEO Series GSE155671. Homo sapiens. 8 samples. Type: Expression profiling by high throughput sequencing.
Figure 4 in The Zagros Mountains acting as a natural barrier to gene flow in the Middle East: more evidence from the evolutionary history of spiny-tailed lizards (Uromasticinae: Saara)
Figure 4. Chronogram of diversification events based on two mtDNA (Cytb and 16S) and one nDNA (ACM4) genes for Uromasticinae, including the genera Saara and Uromastyx. Blue bars show 95% highest posterior density (HPD) intervals of the estimated node ages; values indicated on branches are mean node ages (Mya).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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