Abstract
Hearing thresholds of the Black Sea bottlenose dolphin Tursiops truncatus for tonal and composite underwater sounds within 50 kHz were ascertained in fully or partly submerged (head out of water) animals (trained by operant conditioning with food reinforcement). Perception of sounds conducted through the body deteriorated in all cases (thresholds for 75%-correct response rose typically by 6-24 dB); the least changes were observed for 10 and 20 kHz tones. The aggregate data also suggested significant individual variations.
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