Evidence of a Lombard response in migrating humpback whales (Megaptera novaeangliae)

Dunlop, Rebecca A., Cato, Douglas H. and Noad, Michael J. (2014) Evidence of a Lombard response in migrating humpback whales (Megaptera novaeangliae). Journal of the Acoustical Society of America, 136 1: 430-437. doi:10.1121/1.4883598

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Author Dunlop, Rebecca A.
Cato, Douglas H.
Noad, Michael J.
Title Evidence of a Lombard response in migrating humpback whales (Megaptera novaeangliae)
Formatted title
 Evidence of a Lombard response in migrating humpback whales (Megaptera novaeangliae)
Journal name Journal of the Acoustical Society of America   Check publisher's open access policy
ISSN 0001-4966
Publication date 2014-07
Year available 2014
Sub-type Article (original research)
DOI 10.1121/1.4883598
Open Access Status File (Publisher version)
Volume 136
Issue 1
Start page 430
End page 437
Total pages 8
Place of publication Melville, NY, United States
Publisher A I P Publishing LLC
Collection year 2015
Language eng
Subject 3102 Acoustics and Ultrasonics
1201 Architecture
Formatted abstract
The Lombard reflex is an increase in the subject's vocal levels in response to increased noise levels. This functions to maintain an adequate signal-to-noise ratio at the position of the receiver when noise levels vary. While it has been demonstrated in a small number of mammals and birds including some whales, it has not yet been shown to occur in one of the most vocal species of baleen whale, the humpback whale (Megaptera novaeangliae). Humpback whales were simultaneously visually and acoustically tracked (using an array of calibrated hydrophone buoys) as they migrated southward. Source levels of social vocalizations were estimated from measured received levels and a site-specific empirical sound propagation model developed. In total, 226 social vocalizations from 16 passing groups of whales were selected for final analysis. Noise levels were predominantly wind-dependent (from sea surface motion) and ranged from 81 to 108 dB re 1 μPa in the 36 Hz–2.8 kHz band. Vocalization source levels increased by 0.9 dB for every 1 dB increase in wind-dependent background noise levels, with source levels (at 1 m) being maintained ∼60 dB above the noise level.
Keyword Agroacoustics
Acoustic sensing
Acoustic noise measurement
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Veterinary Science Publications
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