f00u2le3 - ACOUSTICAL OCEANOGRAPHY Unit 2 Lesson 3 Sound...

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©PROJECT OCEANOGRAPHY SPRING 2000 75 A COUSTICAL O CEANOGRAPHY Unit 2. Lesson 3. Sound Use by Marine Mammals Lesson Objectives: Upon completion of this lesson, students will have gained the ability to: understand the importance of sound to marine mammals. measure frequency, wavelength and the speed at which sound travels understand why sound is emitted in different frequencies. Vocabulary: cognition, navigation, maternal, social structure, echolocation Functions and Uses of Sound Sound use by marine mammals has been studied for many years. Generally, marine mammals use sound for communication, exploration, advertisement, locating food, maintaining mother-offspring bonds, and to identify individuals with their pod or group. Echolocation , defined as the ability to gain information from sounds produced by the animal that bounce off distant objects and return as echoes, is an example of how sound is used by marine mammals. Scientists have learned that Odontocetes use echolocation. Often, this ability allows the animal to interpret their surroundings with or without vision. Echolocation is used over great and small distances. These echoes convey much information about the environment. For example, a dolphin can detect a small ball over a football field away, a distance too great to seen by either dolphin or human. Only a few animals have been shown to use echolocation. These include dolphins, bats, and a few species of birds. Some of the sounds these animals produce might be above or below a human’s capability to hear. Although people can not hear the sounds, the animals are using them, and processing them to visualize objects and target others for food, or avoidance.
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©P ROJECT OCEANOGRAPHY SPRING 2000 76 A COUSTICAL O CEANOGRAPHY Echolocation is necessary for navigation. Sperm whales locate their favorite food, squid, by diving with great speed to depths, where there is relatively little light. They use echolocation to determine where the bottom is, and how fast they are approaching it. Finback whales use echolocation for navigation and may use the same sounds for maintaining social structure. Their sounds can be transmitted and heard hundreds of kilometers away. They can determine if an underwater volcano or island might be in their paths, and they can steer away from them.
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This note was uploaded on 07/31/2011 for the course OCB 6050 taught by Professor Staff during the Spring '11 term at University of South Florida.

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f00u2le3 - ACOUSTICAL OCEANOGRAPHY Unit 2 Lesson 3 Sound...

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