Divergent natural selection has been shown to promote speciation in many taxa. However,
although divergent selection often initiates the process of speciation, it often fails to complete …

Evolutionary biology has struggled to explain the coexistence of two basic observations:
Genetic variation is found in almost all traits in the presence of strong natural and sexual …

Genetically correlated traits do not evolve independently, and the covariances between traits
affect the rate at which a population adapts to a specified selection regime. To measure the …

Two symmetric matrices underlie our understanding of microevolutionary change. The first is
the matrix of nonlinear selection gradients (γ) which describes the individual fitness surface …

Many central questions in ecology and evolutionary biology require characterizing
phenotypes that change with time and environmental conditions. Such traits are inherently …

A fundamental question for both evolutionary biologists and breeders is the extent to which
genetic correlations limit the ability of populations to respond to selection. Here I view this …

Drought is a central abiotic stress for both natural plant populations and agricultural crops.
Substantial natural genetic variation in drought resistance traits has been identified in plant …

Populations unable to evolve to selectively favored states are constrained. Genetic
constraints occur when additive genetic variance in selectively favored directions is absent …

Species that coexist in diverse natural communities interact in complex ways that alter each
other's abundances and affect selection on each other's traits. Consequently, predicting trait …

Background Analysis of data on genotypes with different expression in different
environments is a classic problem in quantitative genetics. A review of models for data with …