Detection probability of vocalizing dugongs during playback of conspecific calls
| Autor: | Kotaro Ichikawa, Yukio Miyauchi, Yuki Abe, Nobuaki Arai, Tomonari Akamatsu, Kanjana Adulyanukosol, Kotoe Sasamori, Tomio Shinke |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Passive acoustic monitoring
Models Statistical Sound Spectrography Time Factors Acoustics and Ultrasonics Dugong biology Computer science Bioacoustics Acoustics Oceans and Seas Animals Wild biology.organism_classification Arts and Humanities (miscellaneous) Acoustic Stimulation Chirp Animals Animal communication Underwater Vocalization Animal Underwater acoustics Probability |
| Zdroj: | The Journal of the Acoustical Society of America. 126(4) |
| ISSN: | 1520-8524 |
| Popis: | Dugongs (Dugong dugon) were monitored using simultaneous passive acoustic methods and visual observations in Thai waters during January 2008. Chirp and trill calls were detected by a towed stereo hydrophone array system. Two teams of experienced observers conducted standard visual observations on the same boat. Comparisons of detection probabilities of acoustic and visual monitoring between two independent observers were calculated. Acoustic and visual detection probabilities were 15.1% and 15.7%, respectively, employing a 300 s matching time interval. When conspecific chirp calls were broadcast from an underwater speaker deployed on the side of the observation boat, the detection probability of acoustic monitoring rose to 19.2%. The visual detection probability was 12.5%. Vocal hot spots characterized by frequent acoustic detection of calls were suggested by dispersion analysis, while dugongs were visually observed constantly throughout the focal area (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|