FIGURE 2.

Onset of breeding conditions affects the call-based vocal interactions. (A) Number of breeding calls elicited per morning by males (black) and by females (red) during non-breeding (NB) and breeding (B) conditions. (B) Change in estrogen (E2) levels of males and females from NB to B (B₁: 24 h after the breeding onset; B₂: 24 h after last experimental day). (C) Breeding induced change in reply latency (top) and reply strength (bottom) of males (black) and females (red) for seven different call interactions. Circles reflect the mean estimate from the model, vertical bars the 95% credible intervals (CrI) and each line represents the change within an individual bird. In panels (A,B) Different letters indicate a posterior probability of difference higher than 95%. For panel (C) a probability of difference higher than 95% can be assumed if the estimates of a group do not overlap the CrI of the other group.