Digest: Asymmetrical introgression of belly coloration across a manakin hybrid zone in Panama.

How does sexual selection impact introgression dynamics across a hybrid zone? Long et al. (2024) used historical (1989-1994) and contemporary (2017-2020) samples to quantify the stability of a Panamanian hybrid zone between golden-collared manakins (Manacus vitellinus) and white-collared manakins (M. candei). Their analyses revealed a spatially stable hybrid zone, except for one trait, belly plumage coloration, which has introgressed into the distribution of the white-collared manakin. This finding suggests possible sexual selection for this trait.