Figure 1.
Terminology of shapes and morphological features of doradid swim bladders.
Figure 2.
Lateral (left) and ventral (right) view of the six investigated thorny catfish species.
Swim bladders are given in blue. Scale bar 3 cm.
Table 1.
Swim bladder morphology and measures of species and of swim bladders.
Figure 3.
Mean auditory sensitivities of the investigated doradid species.
Table 2.
Hearing thresholds (dB re 1 µPa) of thorny catfish species investigated.
Figure 4.
Averaged hearing thresholds of thorny catfish species with large (Acanthodoras spinosissimus, Agamyxis pectinifrons, Megalodoras uranoscopus) and small (Amblydoras affinis, Hemidoras morrisi, Oxydoras niger) swim bladders.
Standard errors were only drawn in one direction to avoid overlap.
Figure 5.
Correlation between mean relative swim bladder length (rSBL) and hearing thresholds at different frequencies.
Correlations at A) 70 Hz and B) 100 Hz. Color and symbol code see figure 3. Regression equations: 70 Hz: threshold = 144.7; * rSBL +55.0. 100 Hz: threshold = 136.4 * rSBL +54.5.
Figure 6.
Correlation between mean relative swim bladder length (rSBL) and hearing thresholds at different frequencies.
Correlations at A) 4 kHz, B) 5 kHz and C) 6 kHz. Color and symbol code see figure 3. Regression equations: 4 kHz: threshold = 114.3 * rSBL +52.2; 5 kHz: threshold = 193.3 * rSBL +41.9; 6 kHz: threshold = 270.4 * rSBL +32.3.