Abstract
There is growing concern about the increasing amounts of acoustic pollution in our oceans. Anthropogenic noise sources span a large range of frequencies and amplitudes. The extents to which these noise sources adversely impact marine mammals is poorly understood yet they are of particular significance given that the acoustic environment is crucial for many aspects of marine mammal life. Past and present experiments have addressed the effects of different sounds on the hearing capabilities of captive dolphins. However, only a few individuals from a small number of species have been tested. Our research group has created a portable system that is capable of measuring the hearing thresholds of marine mammals using auditory-evoked potential (AEP) techniques. This portable system has enabled us to obtain audiograms of otherwise inaccessible marine mammal species. This system will also allow us to measure the hearing of stranded animals as well as begin to quantify the normal variations in hearing between different ages and genders of animals in captivity.
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