Ecological opportunities and physical challenges of fast-water habitats have dramatically
shaped the evolution of freshwater fish lineages from a broad diversity of clades globally …

Guppies in Trinidad range across aquatic environments with fish communities that vary in
risk of predation. These communities are often discrete, separated by waterfalls, with high …

Invasive freshwater fish represent a major threat to biodiversity. Here, we first demonstrate
the dramatic, human-mediated range expansion of the Trinidadian guppy (Poecilia …

It is often stated that polymorphisms for mutations affecting fitness of males and females in
opposite directions [sexually antagonistic (SA) polymorphisms] are the main selective force …

Animals are usually expected to avoid mating with relatives (kin avoidance) as incestuous
mating can lead to the expression of inbreeding depression. Yet, theoretical models predict …

The major histocompatibility complex (MHC) is crucial to the adaptive immune response of
vertebrates and is among the most polymorphic gene families known. Its high diversity is …

Gene flow between phenotypically divergent populations can disrupt local adaptation or,
alternatively, may stimulate adaptive evolution by increasing genetic variation. We …

Dendritic landscapes can have ecological properties that differ importantly from simpler
spatial arrangements of habitats. Most dendritic landscapes are structured by elevation, and …

Understanding how natural selection generates and maintains adaptive genetic diversity in
heterogeneous environments is key to predicting the evolutionary response of populations …

For over a century, the live bearing guppy, Poecilia reticulata, has been used to study sexual
selection as well as local adaptation. Natural guppy populations differ in many traits that are …