Whistle source levels of free-ranging bottlenose dolphins and Atlantic spotted dolphins in the Gulf of Mexico

Whistles of bottlenose dolphins (Tursiops truncatus) and Atlantic spotted dolphins (Stenella frontalis) in the eastern Gulf of Mexico were recorded and measured with a calibrated towed hydrophone array. Surveys encountered groups of both bottlenose (N = 10) and spotted dolphins (N = 5). Analysis of...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2014-03, Vol.135 (3), p.1624-1631
Main Authors: Frankel, Adam S, Zeddies, David, Simard, Peter, Mann, David
Format: Article
Language:English
Subjects:
Acoustics - instrumentation
Algorithms
Animals
Bottle-Nosed Dolphin - classification
Bottle-Nosed Dolphin - physiology
Bottle-Nosed Dolphin - psychology
Environmental Monitoring - methods
Gulf of Mexico
Oceans and Seas
Pattern Recognition, Automated
Population Density
Signal Processing, Computer-Assisted
Sound Spectrography
Stenella - classification
Stenella - physiology
Stenella - psychology
Swimming
Transducers
Vocalization, Animal - classification
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Summary:Whistles of bottlenose dolphins (Tursiops truncatus) and Atlantic spotted dolphins (Stenella frontalis) in the eastern Gulf of Mexico were recorded and measured with a calibrated towed hydrophone array. Surveys encountered groups of both bottlenose (N = 10) and spotted dolphins (N = 5). Analysis of those data produced 1695 bottlenose dolphin whistles and 1273 spotted dolphin whistles with a high signal-to-noise ratio. Whistle frequency metrics were lower in bottlenose than spotted dolphins, while whistle duration was longer in spotted dolphins, data that may help inform automatic classification algorithms. Source levels were estimated by determining the range and bearing of an individual dolphin from the array and then adding the predicted transmission loss to the calculated received level. The median bottlenose dolphin source level was 138 dB re 1μPa at 1 m with a range of 114-163 dB re 1μPa at 1 m. The median spotted dolphin source level was 138 dB re 1μPa at 1 m with a range of 115-163 dB re 1μPa at 1 m. These source level measurements, in conjunction with estimates of vocalization rates and transmission loss models, can be used to improve passive acoustically determined dolphin abundance estimates in the Gulf of Mexico.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4863304