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

Speciation is characterized by the evolution of reproductive isolation between two groups of
organisms. Understanding the process of speciation requires the quantification of barriers to …

Although animal pollination is often proposed as a major driver of floral divergence,
questions remain about its importance in plant speciation. One issue is whether pollinator …

An unintended consequence of global change is an increase in opportunities for
hybridization among previously isolated lineages. Here we illustrate how global change can …

In the formation of species, adaptation by natural selection generates distinct combinations
of traits that function well together. The maintenance of adaptive trait combinations in the …

We propose a novel method that uses natural admixture between divergent lineages
(hybridization) to investigate the genetic architecture of reproductive isolation and adaptive …

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

Estimates of hybrid fitness have been used as either a platform for testing the potential role
of natural hybridization in the evolution of species and species complexes or, alternatively …

Instances of hybridization between endemic and alien species pose a threat to species
integrity but also provide us with an opportunity to study the dynamics of gene flow between …

The genic view of the process of speciation is based on the notion that species isolation may
be achieved by a modest number of genes. Although great strides have been made to …