Figure 6.

Oscillogram and spectrogram of an advertisement call of a male Bufo siculus. Recorded at 16°C at the type locality (recorder "Marantz CP430" with Philips unidirectional electric condenser microphone). a. Oscillogram of a call train of ca. 35 s with three calls. b. Zoomed part of the framed (b) section (in Figure 6a) between 16.2 s to 19.95 s (note slight overlay with another male calling in the background). c. Spectrogram of the call section shown in b. The fundamental frequency is at around 1600 Hz and two harmonic vibrations are visible.