Audiograms of a South Indian bat community

Neuweiler, Gerhard; Singh, S. M.; Kandula, Sripathi

doi:10.1007/bf00605398

Cited by 66 publications

(37 citation statements)

References 13 publications

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“…Bats using wideband calls, which produce larger spectral overlap, are more likely to experience jamming than those using narrowband calls, and are therefore more likely to exhibit JAR. In addition, bat species using wideband calls often have a wider audiogram than species using narrowband calls (Neuweiler et al 1984), and may therefore be better able to use frequency shifts for jamming avoidance. Indeed, T. teniotis showed a static JAR, coincident with its use of calls of broader bandwidth than Tap.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of jamming avoidance in echolocating bats

Ulanovsky

Fenton²,

Tsoar

et al. 2004

Proc. R. Soc. Lond. B

156

131

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Animals using active sensing systems such as echolocation or electrolocation may experience interference from the signals of neighbouring conspecifics, which can be offset by a jamming avoidance response (JAR). Here, we report JAR in one echolocating bat (Tadarida teniotis: Molossidae) but not in another (Taphozous perforatus: Emballonuridae) when both flew and foraged with conspecifics. In T. teniotis, JAR consisted of shifts in the dominant frequencies of echolocation calls, enhancing differences among individuals. Larger spectral overlap of signals elicited stronger JAR. Tadarida teniotis showed two types of JAR: (i) for distant conspecifics: a symmetric JAR, with lower-and higher-frequency bats shifting their frequencies downwards and upwards, respectively, on average by the same amount; and (ii) for closer conspecifics: an asymmetric JAR, with only the upper-frequency bat shifting its frequency upwards. In comparison, 'wave-type' weakly electric fishes also shift frequencies of discharges in a JAR, but unlike T. teniotis, the shifts are either symmetric in some species or asymmetric in others. We hypothesize that symmetric JAR in T. teniotis serves to avoid jamming and improve echolocation, whereas asymmetric JAR may aid communication by helping to identify and locate conspecifics, thus minimizing chances of mid-air collisions.

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Section: Discussionmentioning

confidence: 99%

Dynamics of jamming avoidance in echolocating bats

Ulanovsky

Fenton²,

Tsoar

et al. 2004

Proc. R. Soc. Lond. B

156

131

View full text Add to dashboard Cite

show abstract

“…The echo intensity was used to provide a minimum value for the maximum distance at which a bat would be able to detect the trap, assuming a threshold of hearing of 0 dB SPL although other authors reported a detection threshold of 40 dB. The echo intensity was used to provide a minimum value for the maximum distance at which a bat would be able to detect the trap, assuming the threshold of hearing of 0 dB SPL (Kick, 1982;Neuweiler et al, 1984;Coles et al, 1989) although other authors reported a detection threshold of 40 dB.…”

Section: Detection Distance Calculationsmentioning

confidence: 99%

Detection and Avoidance of Harp Traps by Echolocating Bats

Berry

O'connor

Holderied

et al. 2004

Acta Chiropterologica

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“…Phyllostoinids are low intensity callers and are difficult to record. Frequency with maximunl energy has been shown to cossespond with the frequency of best hearing in species with FM calls and CFfFM calls (Schnitzler and Henson, 1980;Neuweiler et al, 1984). Neuweiler et nl.…”

Section: Oralmentioning

confidence: 99%