Historical limits on species co-occurrence determine variation in clade richness among New World passerine birds

摘要

Aim Species richness is unevenly distributed among clades, reflecting differences in the extent to which species co-occur, their rates of geographical turnover and total area occupied. Here, we study richness variation among 10 large clades of New World passerine birds, assessing the dynamics of range expansion and diversification that led to the build-up of co-occurring species.