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Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia

Behavioural observation and acoustic recordings of Irrawaddy dolphins (Orcaella brevirostris) were performed simultaneously in Brunei Bay, Malaysia. Surface behavioural observations were classified into four categories: travelling, foraging, socialising, and milling. A total of 8.43 hours of acousti...

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Main Authors: Hairul Masrini Muhamad, Xu, X., Zhang, X.L., S.A. Jaaman, A.M. Muda, F.D. Haji Ismail, N. Azizul
Format: Article
Language:English
English
Published: Akademi Sains Malaysia 2022
Subjects:
QL700-739.8 Mammals
Online Access:https://eprints.ums.edu.my/id/eprint/34581/1/FULL%20TEXT.pdf
https://eprints.ums.edu.my/id/eprint/34581/2/ABSTRACT.pdf
https://eprints.ums.edu.my/id/eprint/34581/
https://www.akademisains.gov.my/asmsj/article/acoustic-repertoires-related-to-surface-behaviours-of-the-irrawaddy-dolphins-orcaella-brevirostris-in-brunei-bay-malaysia/
https://doi.org/10.32802/asmscj.2022.1095
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spelling my.ums.eprints.345812022-10-28T05:54:00Z https://eprints.ums.edu.my/id/eprint/34581/ Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia Hairul Masrini Muhamad Xu, X. Zhang, X.L. S.A. Jaaman A.M. Muda F.D. Haji Ismail N. Azizul QL700-739.8 Mammals Behavioural observation and acoustic recordings of Irrawaddy dolphins (Orcaella brevirostris) were performed simultaneously in Brunei Bay, Malaysia. Surface behavioural observations were classified into four categories: travelling, foraging, socialising, and milling. A total of 8.43 hours of acoustic recordings were used to retrieve four different types of sounds: whistles, burst-pulsed sounds, click trains, and biphonal sounds. The recorded whistles were frequency-modulated sounds with durations ranging from 0.06 to 3.86 s and a mean minimum frequency of 6.5±2.5 kHz. The burst-pulsed frequency ranged from >48 kHz in at least four variations. Click trains were made up of broadband clicks with variable inter-click intervals and frequencies >48 kHz. The first biphonic sounds for Irrawaddy dolphins have been revealed in this study. Whistle rates were extremely high in milling. Compared to travelling and foraging, socialising had a significantly higher rate of click trains. Across all surface behaviours, there was no significant difference in burst-pulsed rates. This study laid the groundwork for ongoing monitoring of Irrawaddy dolphins and expanding conservation efforts for this species in Malaysia Akademi Sains Malaysia 2022 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/34581/1/FULL%20TEXT.pdf text en https://eprints.ums.edu.my/id/eprint/34581/2/ABSTRACT.pdf Hairul Masrini Muhamad and Xu, X. and Zhang, X.L. and S.A. Jaaman and A.M. Muda and F.D. Haji Ismail and N. Azizul (2022) Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia. ASM Science Journal, 17. pp. 1-13. ISSN 1823-6782 https://www.akademisains.gov.my/asmsj/article/acoustic-repertoires-related-to-surface-behaviours-of-the-irrawaddy-dolphins-orcaella-brevirostris-in-brunei-bay-malaysia/ https://doi.org/10.32802/asmscj.2022.1095
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic QL700-739.8 Mammals
spellingShingle QL700-739.8 Mammals
Hairul Masrini Muhamad
Xu, X.
Zhang, X.L.
S.A. Jaaman
A.M. Muda
F.D. Haji Ismail
N. Azizul
Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
description Behavioural observation and acoustic recordings of Irrawaddy dolphins (Orcaella brevirostris) were performed simultaneously in Brunei Bay, Malaysia. Surface behavioural observations were classified into four categories: travelling, foraging, socialising, and milling. A total of 8.43 hours of acoustic recordings were used to retrieve four different types of sounds: whistles, burst-pulsed sounds, click trains, and biphonal sounds. The recorded whistles were frequency-modulated sounds with durations ranging from 0.06 to 3.86 s and a mean minimum frequency of 6.5±2.5 kHz. The burst-pulsed frequency ranged from >48 kHz in at least four variations. Click trains were made up of broadband clicks with variable inter-click intervals and frequencies >48 kHz. The first biphonic sounds for Irrawaddy dolphins have been revealed in this study. Whistle rates were extremely high in milling. Compared to travelling and foraging, socialising had a significantly higher rate of click trains. Across all surface behaviours, there was no significant difference in burst-pulsed rates. This study laid the groundwork for ongoing monitoring of Irrawaddy dolphins and expanding conservation efforts for this species in Malaysia
format Article
author Hairul Masrini Muhamad
Xu, X.
Zhang, X.L.
S.A. Jaaman
A.M. Muda
F.D. Haji Ismail
N. Azizul
author_facet Hairul Masrini Muhamad
Xu, X.
Zhang, X.L.
S.A. Jaaman
A.M. Muda
F.D. Haji Ismail
N. Azizul
author_sort Hairul Masrini Muhamad
title Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
title_short Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
title_full Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
title_fullStr Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
title_full_unstemmed Acoustic repertoires related to surface behaviours of the Irrawaddy dolphins (Orcaella brevirostris) in Brunei Bay, Malaysia
title_sort acoustic repertoires related to surface behaviours of the irrawaddy dolphins (orcaella brevirostris) in brunei bay, malaysia
publisher Akademi Sains Malaysia
publishDate 2022
url https://eprints.ums.edu.my/id/eprint/34581/1/FULL%20TEXT.pdf
https://eprints.ums.edu.my/id/eprint/34581/2/ABSTRACT.pdf
https://eprints.ums.edu.my/id/eprint/34581/
https://www.akademisains.gov.my/asmsj/article/acoustic-repertoires-related-to-surface-behaviours-of-the-irrawaddy-dolphins-orcaella-brevirostris-in-brunei-bay-malaysia/
https://doi.org/10.32802/asmscj.2022.1095
_version_ 1760231314810732544
score 13.211869

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