The ultimate goal of my work is to understand the link between micro and macroevolutionary processes with specific focus on ecological feedbacks and evolutionary diversification. To achieve these goals, I integrate approaches from evolutionary and physiological ecology to quantitative genetics and phylogenetic comparative methods. My current work uses large-scale field experiments, empirical measures of lifetime fitness and molecular multi-generational pedigree reconstruction to investigate the dynamics of trait evolution in the context of range expansion and species coexistence in passerine birds. Range expansion provides a unique opportunity study ongoing ecological and evolutionary processes and thus to characterize feedbacks between evolutionary and ecological dynamics. Current projects in the lab include 1) the evolution of distinct dispersal morphs 2) the mechanisms of species coexistence at range margins 3) the role of adaptive maternal effects in range expansion 4) niche shifts and species diversification and 5) sexually antagonistic selection and constraints to adaptive evolution.