Figure 1: Acoustic differences across dyads as a function of their genetic relatedness for seven variables.
From: Social shaping of voices does not impair phenotype matching of kinship in mandrills
The seven variables belong to (a) the spectral domain (mean frequency ‘MEAN’ in red, s.d. of the mean frequency SD in purple, first quartile ‘Q25’ in orange, third quartile ‘Q75’ in blue, interquartile range ‘IQR’ in green) and (b) the temporal domain (call ‘DURATION’ in pink, intercall interval ‘ICI’ in light green). For the sake of clarity, we represent average acoustic differences (±s.e.m.) as a function of three levels of relatedness. The three spectrograms (c) on the right of the figure illustrate the acoustic similarity between calls according to relatedness: mandrills 1 and 2 are unrelated (r=0); mandrills 1 and 3 are related (r=0.53).
