Hybrid or “recombinational” speciation refers to the origin of a new homoploid species via
hybridization between chromosomally or genetically divergent parental species. Theory …

New species may arise via hybridization and without a change in ploidy. This process,
termed homoploid hybrid speciation, is theoretically difficult because it requires the …

Hybrid speciation refers to the establishment of novel hybrid genotypes that are
reproductively isolated from their parental species and genetically stabilized. Most …

Sunflowers of the genus Helianthus are models for hybridization research and contain three
of the best-studied examples of homoploid hybrid speciation. To understand a broader …

Abstract.—Reproductive barrier formation between newly derived hybrid taxa and their
parental species represents a major evolutionary hurdle. Here, I examine the development …

The recurrent origin of diploid hybrid species is theoretically improbable because of the
enormous diversity of hybrid genotypes generated by recombination. Recent greenhouse …

Understanding the genetic mechanisms of speciation and basis of species differences is
among the most important challenges in evolutionary biology. Two questions of particular …

Abstract Knowledge of the nature and extent of karyotypic differences between species
provides insight into the evolutionary history of the genomes in question and, in the case of …

Our understanding of homoploid hybrid speciation has advanced substantially since this
mechanism of species formation was codified 50 years ago. Early theory and research …

Although there are many studies of the evolution and ecology of hybrid zones, few extend
over long enough time periods to track evolutionary changes in the zones or assess the …