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    Vocalizations of a Wild Finless Porpoise (Neophocaena asiaeorientalis sunmeri) in the Western Coast of the Taiwan Strait, China

    Access Status
    Fulltext not available
    Authors
    Song, Zhongchang
    Zhang, Yu
    Wang, Xianyan
    Wei, Chong
    Wu, Fuxing
    Miao, Xing
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Song, Z. and Zhang, Y. and Wang, X. and Wei, C. and Wu, F. and Miao, X. 2017. Vocalizations of a Wild Finless Porpoise (Neophocaena asiaeorientalis sunmeri) in the Western Coast of the Taiwan Strait, China. Journal of Biobased Materials and Bioenergy. 11 (1): pp. 45-52.
    Source Title
    Journal of Biobased Materials and Bioenergy
    DOI
    10.1166/jbmb.2017.1642
    ISSN
    1556-6560
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/76253
    Collection
    • Curtin Research Publications
    Abstract

    Vocalizations of a wild finless porpoise (Neophocaena asiaeorientalis sunmeri) were recorded within the dolphin natural reserve, in the western coast of the Taiwan Strait, China. The subsequent acoustical analyses suggested that the porpoise (N. p. sunameri) produced typical phocoenid clicks, with the peak frequency ranging from 123.4 to 141.4 kHz, averaging at 132.8±4.02 kHz (n = 193). The durations of these typical signals ranged from 97 to 130 microseconds, averaging at 111.6±8.49 (n = 193) microseconds. The 3 dB bandwidth had a scope from 5.8 to 15.6 kHz, averaging at 10.49±1.84 kHz (n = 193). For typical clicks, the energy converged on a narrowband frequency range with peak frequency over 120 kHz. The acoustic parameters of the signals were compared with those of signals emitted by finless porpoises from other living regions. Besides, the broadband clicks were also recorded and reported here. The sound energy was more diffuse in frequency domain for the broadband clicks than typical narrowband ones, extending to below 50 kHz and above 180 kHz. During the recordings, the reverberations influenced the signals, shown in both time and frequency domains. The reverberations could disperse the energy of the original narrowband and broadband clicks into several peak frequency ranges. For the signals used by porpoise for echolocation, the noise caused by man-made activities could influence the marine mammal negatively. The researches into porpoise's signals could provide references to protect the animal.

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