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Table 3 Particle accelerations in the three Cartesian directions measured at threshold levels at each test frequency

From: Contribution to the study of acoustic communication in two Belgian river bullheads (Cottus rhenanus and C. perifretum) with further insight into the sound-producing mechanism

Frequency

x-axis a

y-axis a

z-axis a

Mag a

PAL

(Hz)

(μm/s2)

(μm/s2)

(μm/s2)

(μm/s2)

(dB re 1 μm/s2)

50

128

118

358

398

51.99

150

124

116

293

338

50.58

300

121

105

372

405

52.15

600

121

113

471

498

53.94

900

145

137

462

503

54.03

  1. Data show that most of the acoustic energy was along the z-axis, which is equivalent to the direct path (straight line from the transducer to the fish in the test tube). The x-axis is the rostrocaudal axis, and the y-axis is the lateral axis. a, particle acceleration; Mag a, magnitude acceleration of the three directions combined (e.g. [24, 25]). The magnitude was calculated using the following equation: x 2 + y 2 + z 2 . The accelerations were then log transformed to convert to particle acceleration levels (dB re 1 μm/s2).