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

Populations can adapt to novel selection pressures through dramatic frequency changes in
a few genes of large effect or subtle shifts in many genes of small effect. The latter (polygenic …

Recent studies have shown that the repeated evolution of similar phenotypes in response to
similar ecological conditions (here “parallel evolution”) often occurs through mutations in the …

Experimental introductions of species have provided some of the most tractable examples of
rapid phenotypic changes, which may reflect plasticity, the impact of stochastic processes, or …

Although rapid phenotypic evolution has been documented often, the genomic basis of rapid
adaptation to natural environments is largely unknown in multicellular organisms …

The rate of germline mutation is fundamental to evolutionary processes, as it generates the
variation upon which selection acts. The guppy, Poecilia reticulata, is a model of rapid …

Male colour patterns of the Trinidadian guppy (Poecilia reticulata) are typified by extreme
variation governed by both natural and sexual selection. Since guppy colour patterns are …

Guppies are small tropical fish with brightly colored bodies and variable tail shapes. There
are two phenotypes of domestic guppy eye color: red and black. The wild type is black-eyed …

Evaluating the fitness of hybrids can provide important insights into genetic differences
between species or diverging populations. We focused on surface-and cave-ecotypes of the …

Genome scans provide a comprehensive method to explore genome‐wide variation
associated with traits under study. However, linking individual genes to broader functional …