Table 1 Summary of the acoustic variables recorded in Cottus rhenanus and C . perifretum
Sonic characteristics | Cottus rhenanus | Cottus perifretum | Â | ||||
|---|---|---|---|---|---|---|---|
Mean ± S.D. | Ranges | n | Mean ± S.D. | Ranges | n | p-value | |
Sound duration (ms) | 128.1 ± 21.3 | 85 – 175 | 84 | 229.8 ± 41.5 | 175 – 319 | 78 | <0.0001 |
Pulse duration (ms) | 30.3 ± 3.9 | 24 – 45 | 268 | 38.5 ± 7.6 | 22 – 87 | 318 | <0.0001 |
Dominant frequency (Hz) | 169.4 ± 23.7 | 110 – 237 | 268 | 107.6 ± 18.8 | 65 – 194 | 318 | <0.0001 |
Interpulse duration (ms) | 14.3 ± 3.2 | 8 – 24 | 184 | 19.2 ± 4.9 | 11 – 34 | 240 | <0.0001 |
Number of pulses per sound | 3.2 ± 0.5 | 2 – 4 | 84 | 4.0 ± 0.9 | 3 – 6 | 78 | <0.0001 |