We also did not find that the dolphins exhibited substantial hearing losses due to daily exposure to environmental noise, including anthropogenic sources of noise. Overall, we found that dolphins in Sarasota Bay do not exhibit increasing hearing losses with increasing age, nor are male dolphins more likely than female dolphins to have a hearing deficit. In one study, we collected data from 5 females and 3 males, ages 3-31 years, during our annual assessment of the health of the Bay’s dolphins. Remember you can always share any sound with your friends on social media and other apps or upload your own sound clip. Find more sounds like the Dolphin Sounds one in the sfx category page. In this category you have all sound effects, voices and sound clips to play, download and share. The brain’s responses to the sounds were then analyzed to determine each dolphin’s hearing abilities. The Dolphin Sounds meme sound belongs to the sfx. Roughly three categories of sounds can be identified: frequency modulated whistles, burst-pulsed sounds and clicks. Sensors in small suction cups placed on the dolphin’s head measured tiny electrical signals produced by the brain in response to the tones. Dolphins are capable of making a broad range of sounds using nasal airsacs located just below the blowhole. The jawphone makes use of the fact that dolphins hear through their lower jaw, with sounds conducted to the ear through a fat channel associated with the jaw bone. Short duration tones of varying frequencies and sound levels were played to the dolphins using a jawphone (a speaker embedded in a suction cup and attached to the lower jaw of the animal). Hearing losses in these animals can be especially problematic because dolphins rely primarily on sound production and reception to navigate, find food, and to communicate with each other, especially in murky estuarine habitats such as Sarasota Bay.Īn SDRP study measured the hearing abilities of bottlenose dolphins in Sarasota Bay using auditory evoked potential (AEP) procedures based on techniques used to measure hearing in human infants. Bottlenose dolphins can hear at frequencies from about 75 Hertz (Hz) to more than 150,000 Hz - well beyond the range of human hearing (20-20,000 Hz).īecause dolphins are exposed to a wide variety of both naturally-occurring and anthropogenic (human-caused) noise in their environment, we wanted to study whether these noises have negative effects on their hearing abilities.
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