Fig. 5. Mean (±s.e.m.) hearing thresholds of the Lusitanian toadfish in the presence of ambient (blue line) and ship (red line) noises as well as cepstrum-smoothed power spectra of two conspecific sounds: boatwhistle (green line) and grunt train (brown line). The boatwhistle spectrum is calculated from a distance of 20 cm, the grunt train 10 cm away from the calling animals.