• Numerical modeling of whistle...

Treffer: Numerical modeling of whistle reception directivity in Indo-Pacific humpback dolphins (Sousa chinensis).

Title:
Numerical modeling of whistle reception directivity in Indo-Pacific humpback dolphins (Sousa chinensis).
Authors:
Ou W; Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China., Zhang Y; Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China.; School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China., Zhang C; Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China., Fu W; Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China., Dong L; Marine Mammal and Marine Bioacoustics Laboratory, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China., Li S; Marine Mammal and Marine Bioacoustics Laboratory, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China., Wu F; Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China., Song Z; Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China.
Source:
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2026 Jan 01; Vol. 159 (1), pp. 675-684.
Publication Type:
Journal Article
Language:
English
Journal Info:
Publisher: American Institute of Physics Country of Publication: United States NLM ID: 7503051 Publication Model: Print Cited Medium: Internet ISSN: 1520-8524 (Electronic) Linking ISSN: 00014966 NLM ISO Abbreviation: J Acoust Soc Am Subsets: MEDLINE
Imprint Name(s):
Publication: Melville, NY : American Institute of Physics
Original Publication: Lancaster, Pa. [etc.] : American Institute of Physics for the Acoustical Society of America
MeSH Terms:
Dolphins*/physiology , Dolphins*/anatomy & histology , Vocalization, Animal*, Animals ; Sound Spectrography ; Acoustics ; Tomography, X-Ray Computed ; Female ; Male ; Numerical Analysis, Computer-Assisted
Entry Date(s):
Date Created: 20260123 Date Completed: 20260123 Latest Revision: 20260123
Update Code:
20260123
DOI:
10.1121/10.0042236
PMID:
41575258
Database:
MEDLINE

Weitere Informationen

Odontocetes produce diverse acoustic signals, among which whistles play a pivotal role in social communication. However, studies on whistle directivity remain limited, particularly regarding sound reception. In this study, we examined the reception directivity of a constant whistle using three-dimensional numerical models based on computed tomography scans of a calf and an adult Indo-Pacific humpback dolphin (Sousa chinensis). Our results showed that the mandibular fats gathered sounds from the front, while the air sinuses blocked sounds from behind, above, and the contralateral side, thereby enhancing directional reception. Across frequencies from the fundamental at 3.8 kHz to the seventh harmonic at 30.2 kHz, the binaural directivity indices (DIs) of the calf and the adult dolphin ranged from 1.7 to 5.1 dB and from 2.4 to 7.2 dB, respectively. The overall binaural DIs were 1.9 dB in the calf and 2.7 dB in the adult, exceeding those at the fundamental frequency by 0.2 and 0.3 dB, respectively, indicating that the harmonics enhanced the overall whistle reception directivity. The adult exhibited greater whistle reception directivity than the calf, primarily due to its larger size. This study advances our understanding of the mechanisms shaping whistle directivity and its size-dependent variability in odontocetes.
(© 2026 Acoustical Society of America.)