Dugong (Dugong dugon) vocalization patterns recorded by automatic underwater sound monitoring systems

To quantitatively examine the diurnal, or tidal, effects on dugong behavior, we employed passive acoustic observation techniques to monitor the animals. Automatic underwater sound monitoring systems for dugongs (AUSOMS-D) were deployed on the sea floor at depths of about 5 m south of Talibong Island...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2006-06, Vol.119 (6), p.3726-3733
Main Authors: ICHIKAWA, Kotaro, TSUTSUMI, Chika, ARAI, Nobuaki, AKAMATSU, Tomonari, SHINKE, Tomio, HARA, Takeshi, ADULYANUKOSOL, Kanjana
Format: Article
Language:English
Subjects:
Acoustics
Animals
Behavior, Animal - physiology
Circadian Rhythm - physiology
Dugong
Dugong - physiology
Dugong dugong
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Sound Spectrography - instrumentation
Sound Spectrography - methods
Sound Spectrography - veterinary
Thailand
Underwater sound
Vocalization, Animal - classification
Vocalization, Animal - physiology
Water Movements
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Summary:To quantitatively examine the diurnal, or tidal, effects on dugong behavior, we employed passive acoustic observation techniques to monitor the animals. Automatic underwater sound monitoring systems for dugongs (AUSOMS-D) were deployed on the sea floor at depths of about 5 m south of Talibong Island, Thailand. The AUSOMS-D recorded underwater sound in stereo at a sampling frequency of 44.1 kHz for more than 116 consecutive hours. Dugong calls were automatically detected by newly developed software with a detection rate of 36.1% and a false alarm rate of 2.9%. In total, 3453 calls were detected during the 164 h of recording. The autocorrelation of the call rate indicated an attendance cycle of about 24 or 25 h, and the most frequent vocalizations were observed from 0300 to 0500 h. The calculated bearings of the sound sources, i.e., dugongs, were used as an indicator to track the relative numbers of dugongs during the monitoring periods.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2201468