Please use this identifier to cite or link to this item: https://doi.org/10.1242/jeb.091504
Title: Possible age-related hearing loss (presbycusis) and corresponding change in echolocation parameters in a stranded Indo-Pacific humpback dolphin
Authors: Li, S.
Wang, D.
Wang, K.
Hoffmann-Kuhnt, M. 
Fernando, N.
Taylor, E.A.
Lin, W.
Chen, J.
Ng, T.
Keywords: Auditory evoked potential
Biosonar
High-frequency hearing
Marine mammals
Issue Date: Nov-2013
Citation: Li, S., Wang, D., Wang, K., Hoffmann-Kuhnt, M., Fernando, N., Taylor, E.A., Lin, W., Chen, J., Ng, T. (2013-11). Possible age-related hearing loss (presbycusis) and corresponding change in echolocation parameters in a stranded Indo-Pacific humpback dolphin. Journal of Experimental Biology 216 (22) : 4144-4153. ScholarBank@NUS Repository. https://doi.org/10.1242/jeb.091504
Abstract: The hearing and echolocation clicks of a stranded Indo-Pacific humpback dolphin (Sousa chinensis) in Zhuhai, China, were studied. This animal had been repeatedly observed in the wild before it was stranded and its age was estimated to be ∼40years. The animal's hearing was measured using a non-invasive auditory evoked potential (AEP) method. Echolocation clicks produced by the dolphin were recorded when the animal was freely swimming in a 7.5m (width)×22m (length)×4.8m (structural depth) pool with a water depth of ∼2.5m. The hearing and echolocation clicks of the studied dolphin were compared with those of a conspecific younger individual, ∼13years of age. The results suggested that the cut-off frequency of the high-frequency hearing of the studied dolphin was ∼30-40kHz lower than that of the younger individual. The peak and centre frequencies of the clicks produced by the older dolphin were ∼16kHz lower than those of the clicks produced by the younger animal. Considering that the older dolphin was ∼40years old, its lower high-frequency hearing range with lower click peak and centre frequencies could probably be explained by age-related hearing loss (presbycusis). © 2013. Published by The Company of Biologists Ltd.
Source Title: Journal of Experimental Biology
URI: http://scholarbank.nus.edu.sg/handle/10635/110890
ISSN: 00220949
DOI: 10.1242/jeb.091504
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