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Journal of Acoustical Society of America (Tidsskrift)

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The detection performance regarding stationary acoustic monitoring of Yangtze finless porpoises

Neophocaena phocaenoides asiaeorientalis was compared to visual observations. Three stereo

was compared to visual observations. Three stereo

acoustic data loggers A-tag were placed at different locations near the confluence of Poyang Lake

and the Yangtze River, China. The presence and number of porpoises were determined acoustically

and visually during each 1-min time bin. On average, porpoises were acoustically detected

81.7 +/-9.7% of the entire effective observation time, while the presence of animals was confirmed

visually 12.7+/-11.0% of the entire time. Acoustic monitoring indicated areas of high and low

porpoise densities that were consistent with visual observations. The direction of porpoise

movement was monitored using stereo beams, which agreed with visual observations at all

monitoring locations. Acoustic and visual methods could determine group sizes up to five and ten

individuals, respectively.While the acoustic monitoring method had the advantage of high detection

probability, it tended to underestimate group size due to the limited resolution of sound source

bearing angles. The stationary acoustic monitoring method proved to be a practical and useful

alternative to visual observations, especially in areas of low porpoise density for long-term

monitoring.

Titel: Journal of Acoustical Society of America Undertitel: Journal of Acoustical Society of America Volume: 1 Tidsskrifts nummer: 125 Paper id: DOI: 10.1121/1.3021302 Antal sider: 7
1 jan. 2009

Tidsskrift

TidsskriftJournal of Acoustical Society of America

ID: 16053591