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    Steady inter and intra-annual decrease in the vocalization frequency of Antarctic blue whales

    191015_72815_Steady_inter_and_intra-annual_decrease_in_the_vocalization_frequency_of_Anta.pdf (225.5Kb)
    Access Status
    Open access
    Authors
    Gavrilov, Alexander
    McCauley, Robert
    Gedamke, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gavrilov, Alexander N. and McCauley, Robert D. and Gedamke, Jason. 2012. Steady inter and intra-annual decrease in the vocalization frequency of Antarctic blue whales. Journal of the Acoustical Society of America. 131 (6): pp. 4476-4480.
    Source Title
    Journal of the Acoustical Society of America
    DOI
    10.1121/1.4707425
    ISSN
    0001-4966
    Remarks

    Copyright © 2012 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/20.500.11937/27598
    Collection
    • Curtin Research Publications
    Abstract

    Time averaged narrow-band noise near 27 Hz produced by vocalizations of many distant Antarctic blue whales intensifies seasonally from early February to late October in the ocean off Australia’s South West. Spectral characteristics of long term patterns in this noise band were analyzed using ambient noise data collected at the Comprehensive Nuclear-Test-Ban Treaty hydroacoustic station off Cape Leeuwin, Western Australia over 2002–2010. Within 7 day averaged noise spectra derived from 4096-point FFT (~0.06 Hz frequency resolution), the −3-dB width of the spectral peak from the upper tone of Antarctic blue whale vocalization was about 0.5 Hz. The spectral frequency peak of this tonal call was regularly but not gradually decreasing over the 9 years of observation from ~27.7 Hz in 2002 to ~26.6 Hz in 2010. The average frequency peak steadily decreased at a greater rate within a season at 0.4–0.5 Hz/season but then in the next year recovered to approximately the mean value of the previous season. A regression analysis showed that the interannual decrease rate of the peak frequency of the upper tonal call was 0.135 ± 0.003 Hz/year over 2002–2010 (R 2 ≈ 0.99). Possible causes of such a decline in the whale vocalization frequency are considered.

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