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Likely Age-Related Hearing Loss (Presbycusis) in a Stranded Indo-Pacific Humpback Dolphin (Sousa chinensis)
Songhai Li1, Ding Wang2, Kexiong Wang3
1Marine Mammal and Marine Bioacoustics Laboratory, Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China. lish@sidsse.ac.cn.
Abstract:
The hearing of a stranded Indo-Pacific humpback dolphin (Sousa chinensis) in Zhuhai, China, was measured. The age of this animal was estimated to be ~40 years. The animal's hearing was measured using a noninvasive auditory evoked potential (AEP) method. The results showed that the high-frequency hearing cutoff frequency of the studied dolphin was ~30-40 kHz lower than that of a conspecific younger individual ~13 year old. The lower high-frequency hearing range in the older dolphin was explained as a likely result of age-related hearing loss (presbycusis).
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