Kimura, Satoko S. and Sagara, Tomoka and Yoda, Ken and Ponnampalam, Louisa Shobhini (2022) Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia. Bioacoustics-The International Journal of Animal Sound and Its Recording, 31 (5). pp. 545-561. ISSN 0952-4622, DOI https://doi.org/10.1080/09524622.2021.1998796.
Full text not available from this repository.Abstract
The passive acoustic monitoring (PAM) technique has been widely used to detect odontocetes that emit echolocation clicks. However, identifying sympatric dolphins and porpoises using clicks, which is important especially for conservation purposes, remains challenging. In this study, a species identification technique at the family group level using PAM was applied to classify the click trains of two sympatric odontocetes, the Indo-Pacific finless porpoise (Neophocaena phocaenoides, N.p.) and Indo-Pacific humpback dolphin (Sousa chinensis, S.c.). A threshold was identified to discriminate between the two species using the two-band intensity ratios at 130 and 70 kHz. In addition to the significant difference in the two-band intensity ratio, analyses of the click train characteristics revealed that the click train duration and inter-click interval were significantly longer for S.c. than for N.p., indicating that these parameters enable more accurate species identification. Although this study provides a clear means of discriminating between the two species to reveal their distributions and habitat usage, additional studies are recommended to determine whether the same method can be employed to discriminate between other species known to have overlapping distributions in the region, such as Tursiops aduncus or Orcaella brevirostris.
| Item Type: | Article |
|---|---|
| Funders: | Indo-Pacific Cetacean Research and Conservation Fund (Grant No: IPCF 12/2), Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (KAKENHI) (Grant No: JP18H06495 & JP19K20460), Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science, Advanced Research Network (Wildlife Research Center of Kyoto University) (Grant No: JPJSCCA20170005), MMT Co. Inc. (Grant No: 24-3578) |
| Uncontrolled Keywords: | Marine mammal; Cetacean; Odontocete; Biosonar; Echolocation; Click train |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography Q Science > QL Zoology |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 27 Nov 2023 03:15 |
| Last Modified: | 27 Nov 2023 03:15 |
| URI: | http://eprints.um.edu.my/id/eprint/41503 |
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