Over the past 30 years, there has been an increased interest in the effects of anthropomorphically generated noise on the hearing of marine animals. In response to this concern, and to promote the conservation of marine environments, the U.S. Congress passed the Marine Mammal Protection Act (MMPA) in 1972. In essence, this act made it illegal to intentionally harass or harm any marine mammal. Because sound propagating through water has the potential to disrupt behavior patterns or impair the hearing of different species, several government regulatory agencies such as the National Marine Fisheries Service, the Fish and Wildlife Service, and...

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