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6 results for “Campion”
Evolution of putative barrier loci at an intermediate stage of speciation with gene flow in campions (Silene)
Understanding the origin of new species is a central goal in evolutionary biology. Diverging lineages often evolve highly heterogeneous patterns of genetic differentiation; however, the underlying mechanisms are not well understood. We investigated evolutionary processes governing genetic differentiation between the hybridizing campions <i>Silene dioica</i> (L.) Clairv. and <i>S. latifolia</i> Poiret. Demographic modeling indicated that the two species diverged with gene flow. The best-supported scenario with heterogeneity in both migration rate and effective population size suggested that a small proportion of the loci evolved without gene flow. Differentiation (F<sub>ST</sub>) and sequence divergence (d<sub>XY</sub>) were correlated and both tended to peak in the middle of most linkage groups, consistent with reduced gene flow at highly differentiated loci. Highly differentiated loci further exhibited signatures of selection. In between-species population pairs, isolation by distance was stronger for genomic regions with low between-species differentiation than for highly differentiated regions that may contain barrier loci. Moreover, differentiation landscapes within and between species were only weakly correlated suggesting that linked selection due to shared recombination and gene density landscapes is not the dominant determinant of genetic differentiation in these lineages. Instead, our results suggest that divergent selection shaped the genomic landscape of differentiation between the two <i>Silene </i>species, consistent with predictions for speciation in the face of gene flow.
Evolution of putative barrier loci at an intermediate stage of speciation with gene flow in campions (Silene)
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Data from: Ecological divergence plays an important role in strong but complex reproductive isolation in campions (Silene)
New species arise through the evolution of reproductive barriers between formerly interbreeding lineages. Yet, comprehensive assessments of potential reproductive barriers, which are needed to make inferences on processes driving speciation, are only available for a limited number of systems. In this study, we estimated individual and cumulative strengths of seven prezygotic and six postzygotic reproductive barriers between the recently diverged taxa Silene dioica (L.) Clairv. and S. latifolia Poiret using both published and new data. A combination of multiple partial reproductive barriers resulted in near-complete reproductive isolation between S. dioica and S. latifolia that is consistent with earlier estimates of gene flow between the taxa. Extrinsic barriers associated with adaptive ecological divergence were most important, while intrinsic postzygotic barriers had moderate individual strength but contributed only little to total reproductive isolation. These findings are most in line with ecological divergence as driver of speciation. We further found extensive variation in extrinsic reproductive isolation, ranging from sites with strong selection against migrants and hybrids to more intermediate sites where substantial hybridization is possible. This situation may allow for or even promote heterogeneous genetic divergence.
metodiche di analisi che serviranno a descrivere l'esito del referto del campione di laboratorio
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raccolta delle norme che legiferano la motivazione di raccolta e analisi del campione di laboratorio
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Data from: Ecological divergence plays an important role in strong but complex reproductive isolation in campions (Silene)
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