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    Estimated communication range and energetic cost of bottlenose dolphin whistles in a tropical habitat

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    JAS000582.pdf (709.0Kb)
    Date
    2012-01
    Author
    Jensen, Frants H.  Concept link
    Beedholm, Kristian  Concept link
    Wahlberg, Magnus  Concept link
    Bejder, Lars  Concept link
    Madsen, Peter T.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5033
    As published
    https://doi.org/10.1121/1.3662067
    DOI
    10.1121/1.3662067
    Keyword
     Acoustic arrays; Acoustic noise; Acoustic radiators; Acoustic variables measurement; Acoustic wave transmission; Biocommunications; Global Positioning System; Hydrophones; Underwater sound 
    Abstract
    Bottlenose dolphins (Tursiops sp.) depend on frequency-modulated whistles for many aspects of their social behavior, including group cohesion and recognition of familiar individuals. Vocalization amplitude and frequency influences communication range and may be shaped by many ecological and physiological factors including energetic costs. Here, a calibrated GPS-synchronized hydrophone array was used to record the whistles of bottlenose dolphins in a tropical shallow-water environment with high ambient noise levels. Acoustic localization techniques were used to estimate the source levels and energy content of individual whistles. Bottlenose dolphins produced whistles with mean source levels of 146.7±6.2 dB re. 1 μPa(RMS). These were lower than source levels estimated for a population inhabiting the quieter Moray Firth, indicating that dolphins do not necessarily compensate for the high noise levels found in noisy tropical habitats by increasing their source level. Combined with measured transmission loss and noise levels, these source levels provided estimated median communication ranges of 750 m and maximum communication ranges up to 5740 m. Whistles contained less than 17 mJ of acoustic energy, showing that the energetic cost of whistling is small compared to the high metabolic rate of these aquatic mammals, and unlikely to limit the vocal activity of toothed whales.
    Description
    Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): 582-592, doi:10.1121/1.3662067.
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    • Biology
    Suggested Citation
    Journal of the Acoustical Society of America 131 (2012): 582-592
     

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