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Development of Tursiops truncatus Sonar System During First Months of Life in Captivity: Acoustic Interactions with other Community Members

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The aims of the present work are to point out the time necessary for a calf to learn the use of biosonar, the role played by the mother and the other community members in the learning process, and the possible acoustical changes of the community after the entry of a new calf. The Delphinaria of Cattolica and Rimini house two small communities of bottlenose dolphin. The births of Daphne and Blue in autumn 1992 and spring 1997, respectively, offered suitable conditions to carry this study. The sonar signals emitted by the dolphins were collected systematically using a Brüel&Kjær 8105 hydrophone. All the data were processed using MATLAB software m-file language and analyzing statistical and acoustic parameters. The results show that all members of both communities dynamically participated in the calves' learning phase and their acoustic behavior was affected by the presence of the new entries. After several months the calves play a central role within the communities and the other members tend to modify the acoustic features of their biosonar adapting it to that of the calves. On the other hand, the calves seem to be acoustically similar to the other juveniles of the communities.
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Document Type: Research Article

Publication date: 01 September 2002

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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