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    Source levels of dugong (dugong dugon) vocalizations recorded in Shark Bay

    196876_105293_parsons_2013_sourc__level__o__dugong_calls.pdf (2.921Mb)
    Access Status
    Open access
    Authors
    Parsons, Miles
    Holley, Dave
    McCauley, Robert
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Parsons, Miles and Holley, Dave and McCauley, Robert. 2013. Source levels of dugong (dugong dugon) vocalizations recorded in Shark Bay. Journal of the Acoustical Society of America. 134 (3, pt 2): pp. 2582-2588.
    Source Title
    Journal of the Acoustical Society of America
    DOI
    10.1121/1.4816583
    ISSN
    0001-4966
    Remarks

    Copyright © 2013 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America

    URI
    http://hdl.handle.net/20.500.11937/40071
    Collection
    • Curtin Research Publications
    Abstract

    Dugongs (Dugong dugon) spend significant time in shallow, turbid waters and are often active at night, conditions which are not conducive to visual cues. In part, as a result, dugongs vocalize to gain or pass information. Passive acoustic recording is a useful tool for remote detection of vocal marine animals, but its application to dugongs has been little explored compared with other mammals. Aerial surveys, often used to monitor dugong distribution and abundance, are not always financially or logistically viable and involve inherent availability and perception bias considerations. Passive acoustic monitoring is also subject to sampling biases and a first step to identifying these biases and understanding the detection or communication range of animal calls is to determine call source level. In March 2012, four dugongs were fitted with satellite tags in Shark Bay, Western Australia by the Department of Environment and Conservation. During this, acoustic recordings were taken at 5.1 m range. Source levels for each of five call types (two types of chirp, bark, squeak, and quack) were estimated, assuming spherical spreading as the transmission loss. Mean source levels for these call types were 139 (n = 19), 135 (12), 142 (2), 158 (1), and 136 (9) dB re 1 μPa at 1 m, respectively.

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