Speciation is a fundamental evolutionary process, the knowledge of which is crucial for
understanding the origins of biodiversity. Genomic approaches are an increasingly …

Ecologically mediated selection against hybrids, caused by hybrid phenotypes fitting poorly
into available niches, is typically viewed as distinct from selection caused by epistatic …

The origin of biological diversity, via the formation of new species, can be inextricably linked
to adaptation to the ecological environment. Specifically, ecological processes are central to …

Sunflower (Helianthus annuus L.) is one of the few crops native to the United States. The
current USDA–ARS National Plant Germplasm System (NPGS) crop wild relatives sunflower …

Reduced fitness in interpopulation hybrids can be a first indication of genetic
incompatibilities that may ultimately lead to reproductive isolation and speciation. A growing …

Background Analyses of speciation genes–genes that contribute to the cessation of gene
flow between populations–can offer clues regarding the ecological settings, evolutionary …

Most heritable information in eukaryotic cells is encoded in the nuclear genome, with
inheritance patterns following classic Mendelian segregation. Genomes residing in the …

Hybrid incompatibilities occur when interactions between opposite ancestry alleles at
different loci reduce the fitness of hybrids. Most work on incompatibilities has focused on …

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

Assessing the relative importance of the various pathways to diversification is a central goal
of biodiversity researchers. For plant biologists, and increasingly across the spectrum of …