Underwater audiogram of a tucuxi (Sotalia fluviatilis guianensis)
作者:
Matthias Sauerland,
Guido Dehnhardt,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1998)
卷期:
Volume 103,
issue 2
页码: 1199-1204
ISSN:0001-4966
年代: 1998
DOI:10.1121/1.421228
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Using a go/no go response paradigm, a tucuxi (Sotalia fluviatilis guianensis) was trained to respond to pure-tone signals for an underwater hearing test. Auditory thresholds were obtained from 4 to 135 kHz. The audiogram curve shows that thisSotaliahad an upper limit of hearing at 135 kHz; from 125 to 135 kHz sensitivity decreased by 475 dB/oct. This coincides with results from electrophysiological threshold measurements. The range of best hearing (defined as 10 dB from maximum sensitivity) was between 64 and 105 kHz. This range appears to be narrower and more restricted to higher frequencies inSotalia fluviatilis guianensisthan in other odontocete species that had been tested before. Peak frequencies of echolocation pulses reported from free-rangingSotaliacorrespond with the range of most sensitive hearing of this test subject.
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