Reproductive isolation in plants occurs through multiple barriers that restrict gene flow
between populations, but their origins remain uncertain. Work in the past decade has shown …

The significance of prezygotic isolation for speciation has been recognized at least since the
Modern Synthesis. However, fundamental questions remain. For example, how are genetic …

Species often include multiple ecotypes that are adapted to different environments.
However, it is unclear how ecotypes arise and how their distinctive combinations of adaptive …

Genomic studies of speciation often report the presence of highly differentiated genomic
regions interspersed within a milieu of weakly diverged loci. The formation of these …

Allopatric speciation requiring an unbroken period of geographical isolation has been the
standard model of neo-Darwinism. While doubts have been repeatedly raised, strict …

Organisms exhibit an incredible diversity of life history strategies as adaptive responses to
environmental variation. The establishment of novel life history strategies involves multilocus …

Environmental gradients are very common and many plant species respond to them through
adaptive genetic change. This can be a first step along a continuum of change that leads …

Parallel evolution of similar phenotypes provides strong evidence for the operation of natural
selection. Where these phenotypes contribute to reproductive isolation, they further support …

Cytonuclear discordance is commonly observed in phylogenetic studies, yet few studies
have tested whether these patterns reflect incomplete lineage sorting or organellar …

The study of genetic exchange resulting from natural hybridization, horizontal gene transfer,
and viral recombination has long been marked by controversy between researchers holding …