Fig. 5
From: Patterns of introgression vary within an avian hybrid zone
Hypothesis testing for endogenous factors of natural selection. Top panel depicts sex ratio of all recent-generation hybrid sparrows (F1/F2) across both study sites and years in the center of the hybrid zone (2016 & 2017) for the two age classes: adult and nestling. Bottom two panels show the sex ratio of all recent-generation hybrid sparrows between the inland (left) and coastal (right) study sites within the center of the hybrid zone for the two age classes: adult and nestling. Black shading represents females while the gray shading represents males in all panels