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    Propagation of narrow-band-high-frequency clicks : measured and modeled transmission loss of porpoise-like clicks in porpoise habitats

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    JAS000560.pdf (700.6Kb)
    Date
    2010-01
    Author
    DeRuiter, Stacy L.  Concept link
    Hansen, Michael  Concept link
    Koopman, Heather N.  Concept link
    Westgate, Andrew J.  Concept link
    Tyack, Peter L.  Concept link
    Madsen, Peter T.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3139
    As published
    https://doi.org/10.1121/1.3257203
    DOI
    10.1121/1.3257203
    Keyword
     Bioacoustics; Biocommunications; Mechanoception; Underwater acoustic propagation; Zoology 
    Abstract
    Estimating the range at which harbor porpoises can detect prey items and environmental objects is integral to understanding their biosonar. Understanding the ranges at which they can use echolocation to detect and avoid obstacles is particularly important for strategies to reduce bycatch. Transmission loss (TL) during acoustic propagation is an important determinant of those detection ranges, and it also influences animal detection functions used in passive acoustic monitoring. However, common assumptions regarding TL have rarely been tested. Here, TL of synthetic porpoise clicks was measured in porpoise habitats in Canada and Denmark, and field data were compared with spherical spreading law and ray-trace (Bellhop) model predictions. Both models matched mean observations quite well in most cases, indicating that a spherical spreading law can usually provide an accurate first-order estimate of TL for porpoise sounds in porpoise habitat. However, TL varied significantly (±10 dB) between sites and over time in response to variability in seafloor characteristics, sound-speed profiles, and other short-timescale environmental fluctuations. Such variability should be taken into account in estimates of the ranges at which porpoises can communicate acoustically, detect echolocation targets, and be detected via passive acoustic monitoring.
    Description
    Author Posting. © Acoustical Society of America, 2010. 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 127 (2010): 560-567, doi:10.1121/1.3257203.
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    • Biology
    Suggested Citation
    Journal of the Acoustical Society of America 127 (2010): 560-567
     

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