Pollen competition as a unilateral reproductive barrier between sympatric diploid and tetraploid Chamerion angustifolium

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Genome duplication and the evolution of conspecific pollen precedence.

Conspecific pollen precedence can be a strong reproductive barrier between polyploid and diploid species, but the role of genome multiplication in the evolution of this barrier has not been investigated. Here, we examine the direct effect of genome duplication on the evolution of pollen siring success in tetraploid Chamerion angustifolium. To separate the effects of genome duplication from sele...

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Hybridization and reproductive isolation between diploid Erythronium mesochoreum and its tetraploid congener E. albidum (Liliaceae).

Polyploidy has played an important role in angiosperm diversification, but how polyploidy contributes to reproductive isolation remains poorly understood. Most work has focused on postzygotic reproductive barriers, and the influence of ploidy differences on prezygotic barriers is understudied. To address these gaps, we quantified hybrid occurrence, interspecific self-compatibility differences, ...

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Parental gametes unite to form a zygote that develops into an adult with gonads that, in turn, produce gametes. Interruption of this germinal cycle by prezygotic or postzygotic reproductive barriers can result in two independent cycles, each with the potential to evolve into a new species. When the speciation process is complete, members of each species are fully reproductively isolated from th...

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Mechanisms underlying competitive interactions are important in understanding the structure of planktonic communities, particularly the coexistence of similar species. Here we present experimental results of exploitative competition among three sympatric sibling species of the Brachionus plicatilis complex for two differently-sized species of food microalgae. These three rotifer species are to ...

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ژورنال

عنوان ژورنال: Proceedings of the Royal Society of London. Series B: Biological Sciences

سال: 2002

ISSN: 0962-8452,1471-2954

DOI: 10.1098/rspb.2002.2196