Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory.
The developments of marine observatories and automatic sound detection algorithms have facilitated the long-term monitoring of multiple species of odontocetes. Although classification remains difficult, information on tonal sound in odontocetes (i.e., toothed whales, including dolphins and porpoises...
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ftdoajarticles:oai:doaj.org/article:7289818dbf9b4f9980cd152036f21afc 2023-05-15T18:33:33+02:00 Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. Tzu-Hao Lin Hsin-Yi Yu Chi-Fang Chen Lien-Siang Chou 2015-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0123943 https://doaj.org/article/7289818dbf9b4f9980cd152036f21afc EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4414466?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0123943 https://doaj.org/article/7289818dbf9b4f9980cd152036f21afc PLoS ONE, Vol 10, Iss 4, p e0123943 (2015) Medicine R Science Q article 2015 ftdoajarticles https://doi.org/10.1371/journal.pone.0123943 2022-12-31T03:58:38Z The developments of marine observatories and automatic sound detection algorithms have facilitated the long-term monitoring of multiple species of odontocetes. Although classification remains difficult, information on tonal sound in odontocetes (i.e., toothed whales, including dolphins and porpoises) can provide insights into the species composition and group behavior of these species. However, the approach to measure whistle contour parameters for detecting the variability of odontocete vocal behavior may be biased when the signal-to-noise ratio is low. Thus, methods for analyzing the whistle usage of an entire group are necessary. In this study, a local-max detector was used to detect burst pulses and representative frequencies of whistles within 4.5-48 kHz. Whistle contours were extracted and classified using an unsupervised method. Whistle characteristics and usage pattern were quantified based on the distribution of representative frequencies and the composition of whistle repertoires. Based on the one year recordings collected from the Marine Cable Hosted Observatory off northeastern Taiwan, odontocete burst pulses and whistles were primarily detected during the nighttime, especially after sunset. Whistle usage during the nighttime was more complex, and whistles with higher frequency were mainly detected during summer and fall. According to the multivariate analysis, the diurnal variation of whistle usage was primarily related to the change of mode frequency, diversity of representative frequency, and sequence complexity. The seasonal variation of whistle usage involved the previous three parameters, in addition to the diversity of whistle clusters. Our results indicated that the species and behavioral composition of the local odontocete community may vary among seasonal and diurnal cycles. The current monitoring platform facilitates the evaluation of whistle usage based on group behavior and provides feature vectors for species and behavioral classification in future studies. Article in Journal/Newspaper toothed whales Directory of Open Access Journals: DOAJ Articles PLOS ONE 10 4 e0123943 |
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Medicine R Science Q Tzu-Hao Lin Hsin-Yi Yu Chi-Fang Chen Lien-Siang Chou Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
topic_facet |
Medicine R Science Q |
description |
The developments of marine observatories and automatic sound detection algorithms have facilitated the long-term monitoring of multiple species of odontocetes. Although classification remains difficult, information on tonal sound in odontocetes (i.e., toothed whales, including dolphins and porpoises) can provide insights into the species composition and group behavior of these species. However, the approach to measure whistle contour parameters for detecting the variability of odontocete vocal behavior may be biased when the signal-to-noise ratio is low. Thus, methods for analyzing the whistle usage of an entire group are necessary. In this study, a local-max detector was used to detect burst pulses and representative frequencies of whistles within 4.5-48 kHz. Whistle contours were extracted and classified using an unsupervised method. Whistle characteristics and usage pattern were quantified based on the distribution of representative frequencies and the composition of whistle repertoires. Based on the one year recordings collected from the Marine Cable Hosted Observatory off northeastern Taiwan, odontocete burst pulses and whistles were primarily detected during the nighttime, especially after sunset. Whistle usage during the nighttime was more complex, and whistles with higher frequency were mainly detected during summer and fall. According to the multivariate analysis, the diurnal variation of whistle usage was primarily related to the change of mode frequency, diversity of representative frequency, and sequence complexity. The seasonal variation of whistle usage involved the previous three parameters, in addition to the diversity of whistle clusters. Our results indicated that the species and behavioral composition of the local odontocete community may vary among seasonal and diurnal cycles. The current monitoring platform facilitates the evaluation of whistle usage based on group behavior and provides feature vectors for species and behavioral classification in future studies. |
format |
Article in Journal/Newspaper |
author |
Tzu-Hao Lin Hsin-Yi Yu Chi-Fang Chen Lien-Siang Chou |
author_facet |
Tzu-Hao Lin Hsin-Yi Yu Chi-Fang Chen Lien-Siang Chou |
author_sort |
Tzu-Hao Lin |
title |
Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
title_short |
Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
title_full |
Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
title_fullStr |
Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
title_full_unstemmed |
Passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
title_sort |
passive acoustic monitoring of the temporal variability of odontocete tonal sounds from a long-term marine observatory. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0123943 https://doaj.org/article/7289818dbf9b4f9980cd152036f21afc |
genre |
toothed whales |
genre_facet |
toothed whales |
op_source |
PLoS ONE, Vol 10, Iss 4, p e0123943 (2015) |
op_relation |
http://europepmc.org/articles/PMC4414466?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0123943 https://doaj.org/article/7289818dbf9b4f9980cd152036f21afc |
op_doi |
https://doi.org/10.1371/journal.pone.0123943 |
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PLOS ONE |
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10 |
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e0123943 |
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