I am driven by a curiosity of how the patterns of nature’s diversity can be explained. Why do some lineages radiate into several niche specialists whereas others remain as a single generalist lineage? Why are some species range-restricted while other have a global distribution? What factors can explain—and predict(?)—the outcome when closely related taxa meet, leading to homogenization of the lineages, or character displacement and/or reinforcement? How are these processes of differentiation, which can be readily observed in the phenotype, reflected at a molecular level? And, contrary to differentiation, are convergent phenotypes due to similar selective pressures in distantly related lineages also converging at the genomic level?
In also dabble in phylogenetics and phylogeography, avian taxonomy, bird migration ecology, the impact of climate change on phenology, and genome evolution.