Table 1.

Mean hearing thresholds under different noise conditions and threshold shifts (with the baseline audiogram as reference) of the Lusitanian toadfish

Baseline Ambient Ship
Frequency (Hz)Hearing threshold (dB re. 1 μPa)Hearing threshold (dB re. 1 μPa)Threshold shift (dB)Hearing threshold (dB re. 1 μPa)Threshold shift (dB)
5076.77+1.96105.97+1.5429.2112.65+1.6835.88
-2.53-1.87-2.08
10092.59+1.03102.56+0.809.97114.73+0.8922.14
-1.16-0.88-1.00
20098.29+0.70101.61+1.913.32114.44+1.7016.15
-0.77-2.46-2.11
300102.01+1.11102.82+2.020.81113.90+1.0711.89
-1.28-2.63-1.23
500110.54+1.58110.57+0.860.03118.12+1.517.58
-1.93-0.96-1.83
800115.86+1.75116.99+1.881.13125.33+1.339.47
-2.19-2.40-1.58
1000124.16+1.81119.84+0.79-4.32127.36+1.313.20
-2.28-0.87-1.54
  • Threshold hearing values are means ± s.e.m.; N=9, baseline; N=6, ambient and ship noise audiograms.