Understanding how pollen moves between species is critical to understanding speciation,
diversification, and evolution of flowering plants. For co-flowering species that share …

How barriers to gene flow arise and are maintained are key questions in evolutionary
biology. Speciation research has mainly focused on barriers that occur either before mating …

Evolutionists have long recognized the role of reproductive isolation in speciation, but the
relative contributions of different reproductive barriers are poorly understood. We examined …

Summary 599I. Introduction 599II. Concepts and terminology 600III. Historical background
600IV. Studies of experimental hybrids 6011. Isolating mechanisms 6012. Prezygotic …

▪ Abstract The evolution of reproductive isolation is perhaps the most significant stage in the
process of species formation, and the study of reproductive barriers currently dominates …

The acquisition of floral nectar spurs is correlated with increased species diversity across
multiple clades. We tested whether variation in nectar spurs influences reproductive …

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

Ecological factors that reduce the effectiveness of cross‐pollination are likely to play a role in
the frequent evolution of routine self‐fertilization in flowering plants. However, we lack …

One of the striking observations from the young field of molecular evolutionary biology has
been the high frequency of cases where taxon-specific markers are found to differ widely in …

Pollen competition and selection have significant evolutionary consequences, but very little
is known about how they can be modulated. We have examined in cherry (Prunus avium L.) …