@article {57969, title = {The effect of biological and anthropogenic sound on the auditory sensitivity of oyster toadfish, Opsanus tau}, year = {2019}, abstract = {

Many aquatic organisms use vocalizations for reproductive behavior; therefore, disruption of their soundscape could adversely affect their life history. Male oyster toadfish (Opsanus tau) establish nests in shallow waters during spring and attract female fish with boatwhistle vocalizations. Males exhibit high nest fidelity, making them susceptible to anthropogenic sound in coastal waters, which could mask their vocalizations and/or reduce auditory sensitivity levels. Additionally, the effect of self-generated boatwhistles on toadfish auditory sensitivity has yet to be addressed. To investigate the effect of sound exposure on toadfish auditory sensitivity, sound pressure and particle acceleration sensitivity curves were determined using auditory evoked potentials before and after (0-, 1-, 3-, 6- and 9-day) exposure to 1- or 12-h of continuous playbacks to ship engine sound or conspecific vocalization. Exposure to boatwhistles had no effect on auditory sensitivity. However, exposure to anthropogenic sound caused significant decreases in auditory sensitivity for at least 3 days, with shifts up to 8 dB SPL and 20 dB SPL immediately following 1- and 12-h anthropogenic exposure, respectively. Understanding the effect of self-generated and anthropogenic sound exposure on auditory sensitivity provides an insight into how soundscapes affect acoustic communication.

}, keywords = {AEP, anthropogenic, Particle acceleration level, Sound Pressure Level, TTS}, doi = {10.1007/s00359-019-01381-x}, url = {http://link.springer.com/10.1007/s00359-019-01381-x}, author = {Rogers, Loranzie S. and Putland, Rosalyn L. and Allen F. Mensinger} } @article {53135, title = {Insect hearing in the field II. Male spacing behaviour and correlated acoustic cues in the bushcricket Mygalopsis marki}, journal = {Journal of Comparative Physiology A}, volume = {159}, year = {1986}, pages = {627{\textendash}638}, abstract = {

1. Distances between calling maleMygalopsis marki Bailey (Orthoptera: Tettigoniidae) were measured in two geographically distinct populations. Mean intermale distances differed significantly in the two habitats (6.2 m and 11.5 m), but the sound pressure level of the nearest neighbour, measured at each focal male, was close to 65 dB SPL in both populations (Figs. 4, 6).

2. Using the response of an identified auditory interneuron as a \‘biological microphone\’, the maximum hearing distance of males was tested. It was found to be affected by the size of the calling male, its posture, perch height and the vegetation density. Perch height alone influenced the maximum broadcast area of males by some 100\%. Nearest neighbour distances were less than half the maximum hearing distances, confirming by neurophysiological methods that males do not space on threshold sensitivity to the complete call (Fig. 5).

3. The ability of the bushcricket to perceive the temporal characteristic of the call was also tested with the auditory interneuron over increasing distances from a signaller. The temporal integrity of the song was found to be maintained over the whole broadcasting area (Fig. 9).

4. The call has two energy peaks at 10 kHz and 20 kHz. The intensity of each peak attenuated differentially with increasing distance from the signaller; the low frequency component had a low variance at the nearest neighbour distance (SD: +4 dB/\−6 dB) compared to the high frequency component (SD: +5 dB/\−12.5 dB) (Fig. 8). The importance of the total sound pressure level and the relative intensity of the major frequency components of the song are discussed in relation to likely cues available to the male for maintaining spacing.

}, keywords = {Focal Male, Frequency Component, High Frequency Component, Neighbour Distance, Sound Pressure Level}, author = {Heiner R{\"o}mer and Winston J. Bailey} }