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Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia

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 identif...

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Main Authors: Kimura, Satoko S., Sagara, Tomoka, Yoda, Ken, Ponnampalam, Louisa Shobhini
Format: Article
Published: Taylor & Francis Ltd 2022
Subjects:
GC Oceanography
QL Zoology
Online Access:http://eprints.um.edu.my/41503/
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spelling my.um.eprints.415032023-11-27T03:15:32Z http://eprints.um.edu.my/41503/ Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia Kimura, Satoko S. Sagara, Tomoka Yoda, Ken Ponnampalam, Louisa Shobhini GC Oceanography QL Zoology 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. Taylor & Francis Ltd 2022-09-03 Article PeerReviewed 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 <https://doi.org/10.1080/09524622.2021.1998796>. 10.1080/09524622.2021.1998796
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic GC Oceanography
QL Zoology
spellingShingle GC Oceanography
QL Zoology
Kimura, Satoko S.
Sagara, Tomoka
Yoda, Ken
Ponnampalam, Louisa Shobhini
Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
description 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.
format Article
author Kimura, Satoko S.
Sagara, Tomoka
Yoda, Ken
Ponnampalam, Louisa Shobhini
author_facet Kimura, Satoko S.
Sagara, Tomoka
Yoda, Ken
Ponnampalam, Louisa Shobhini
author_sort Kimura, Satoko S.
title Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
title_short Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
title_full Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
title_fullStr Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
title_full_unstemmed Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: An example from Langkawi, Malaysia
title_sort acoustic identification of the sympatric species indo-pacific finless porpoise and indo-pacific humpback dolphin: an example from langkawi, malaysia
publisher Taylor & Francis Ltd
publishDate 2022
url http://eprints.um.edu.my/41503/
_version_ 1783876719366635520
score 13.211869

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