FIGURE 17 in The use of bioacoustics in anuran taxonomy: theory, terminology, methods and recommendations for best practice

FIGURE 17. Interpretation of advertisement call differences: (A) Example showing spectrograms and oscillograms with distinct qualitative call differences of two frogs in sympatry (syntopy), providing evidence for species-level divergence, despite a comparatively low level of genetic divergence (Köhler et al. 2010). (B) Example showing distinct and constant quantitative call differences of two frogs in sympatry (syntopy), providing clear indication of species-level divergence, corroborated by high genetic divergence (Vences et al. 2010b). Spectrograms produced with CoolEdit Pro at Hanning window function, 256 bands resolution.