Figure 5 in Insect noise avoidance in the dawn chorus of Neotropical birds

Figure 5. First call time measured as minutes from sunrise plotted against (a) peak frequency of each species and (b) the difference between background noise at first call time and over all average background noise for the 1 h period. Background noise values were calculated at each species' peak frequency band. Each point represents the mean over all days and sites (±SE) per species. Negative noise values indicate that birds started singing at times when ambient noise level at their songs' peak frequency was lower than the rest of the recording period. Singing location is displayed as either in the canopy (circles, solid line) or below (triangles, dashed line) the canopy. See Table 2 for the parameter estimates associated with these variables.