The JIP has funded independent research to help increase understanding of the potential temporary hearing impacts from seismic sound sources on bottlenose dolphins, and differentiate their impact from that of other sound sources such as sonars. Some of the findings from these studies include: – Dolphins are relatively insensitive to air gun impulses. This is primarily because air gun impulses have mostly low-frequency energy and contain little energy at the high-frequencies where dolphin hearing is most sensitive. – Behavioural responses to repeated impulses may reduce the levels of sound exposure by the ears, thus reducing the likelihood of temporary threshold shifts.
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