Low-frequency sampling rates are effective to record bottlenose dolphins
Acoustic monitoring in cetacean studies is an effective but expensive approach. This is partly because of the high sampling rate required by acoustic devices when recording high-frequency echolocation clicks. However, the proportion of echolocation clicks recorded at different frequencies is unknown...
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crroyalsociety:10.1098/rsos.201598 2024-06-02T08:14:30+00:00 Low-frequency sampling rates are effective to record bottlenose dolphins Romeu, Bianca Machado, Alexandre M. S. Daura-Jorge, Fábio G. Cremer, Marta J. de Moraes Alves, Ana Kássia Simões-Lopes, Paulo C. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior 2021 http://dx.doi.org/10.1098/rsos.201598 https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.201598 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsos.201598 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Royal Society Open Science volume 8, issue 7, page 201598 ISSN 2054-5703 journal-article 2021 crroyalsociety https://doi.org/10.1098/rsos.201598 2024-05-07T14:16:40Z Acoustic monitoring in cetacean studies is an effective but expensive approach. This is partly because of the high sampling rate required by acoustic devices when recording high-frequency echolocation clicks. However, the proportion of echolocation clicks recorded at different frequencies is unknown for many species, including bottlenose dolphins. Here, we investigated the echolocation clicks of two subspecies of bottlenose dolphins in the western South Atlantic Ocean. The possibility of recording echolocation clicks at 24 and 48 kHz was assessed by two approaches. First, we considered the clicks in the frequency range up to 96 kHz. We found a loss of 0.95–13.90% of echolocation clicks in the frequency range below 24 kHz, and 0.01–0.42% below 48 kHz, to each subspecies. Then, we evaluated these recordings downsampled at 48 and 96 kHz and confirmed that echolocation clicks are recorded at these lower frequencies, with some loss. Therefore, despite reaching high frequencies, the clicks can also be recorded at lower frequencies because echolocation clicks from bottlenose dolphins are broadband. We concluded that ecological studies based on the presence–absence data are still effective for bottlenose dolphins when acoustic devices with a limited sampling rate are used. Article in Journal/Newspaper South Atlantic Ocean The Royal Society Royal Society Open Science 8 7 201598 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
language |
English |
description |
Acoustic monitoring in cetacean studies is an effective but expensive approach. This is partly because of the high sampling rate required by acoustic devices when recording high-frequency echolocation clicks. However, the proportion of echolocation clicks recorded at different frequencies is unknown for many species, including bottlenose dolphins. Here, we investigated the echolocation clicks of two subspecies of bottlenose dolphins in the western South Atlantic Ocean. The possibility of recording echolocation clicks at 24 and 48 kHz was assessed by two approaches. First, we considered the clicks in the frequency range up to 96 kHz. We found a loss of 0.95–13.90% of echolocation clicks in the frequency range below 24 kHz, and 0.01–0.42% below 48 kHz, to each subspecies. Then, we evaluated these recordings downsampled at 48 and 96 kHz and confirmed that echolocation clicks are recorded at these lower frequencies, with some loss. Therefore, despite reaching high frequencies, the clicks can also be recorded at lower frequencies because echolocation clicks from bottlenose dolphins are broadband. We concluded that ecological studies based on the presence–absence data are still effective for bottlenose dolphins when acoustic devices with a limited sampling rate are used. |
author2 |
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior |
format |
Article in Journal/Newspaper |
author |
Romeu, Bianca Machado, Alexandre M. S. Daura-Jorge, Fábio G. Cremer, Marta J. de Moraes Alves, Ana Kássia Simões-Lopes, Paulo C. |
spellingShingle |
Romeu, Bianca Machado, Alexandre M. S. Daura-Jorge, Fábio G. Cremer, Marta J. de Moraes Alves, Ana Kássia Simões-Lopes, Paulo C. Low-frequency sampling rates are effective to record bottlenose dolphins |
author_facet |
Romeu, Bianca Machado, Alexandre M. S. Daura-Jorge, Fábio G. Cremer, Marta J. de Moraes Alves, Ana Kássia Simões-Lopes, Paulo C. |
author_sort |
Romeu, Bianca |
title |
Low-frequency sampling rates are effective to record bottlenose dolphins |
title_short |
Low-frequency sampling rates are effective to record bottlenose dolphins |
title_full |
Low-frequency sampling rates are effective to record bottlenose dolphins |
title_fullStr |
Low-frequency sampling rates are effective to record bottlenose dolphins |
title_full_unstemmed |
Low-frequency sampling rates are effective to record bottlenose dolphins |
title_sort |
low-frequency sampling rates are effective to record bottlenose dolphins |
publisher |
The Royal Society |
publishDate |
2021 |
url |
http://dx.doi.org/10.1098/rsos.201598 https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.201598 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsos.201598 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Royal Society Open Science volume 8, issue 7, page 201598 ISSN 2054-5703 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsos.201598 |
container_title |
Royal Society Open Science |
container_volume |
8 |
container_issue |
7 |
container_start_page |
201598 |
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