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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ftpubmed:oai:pubmedcentral.nih.gov:8316790 2023-05-15T18:21:07+02:00 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. 2021-07-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ http://www.ncbi.nlm.nih.gov/pubmed/34350008 https://doi.org/10.1098/rsos.201598 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ http://www.ncbi.nlm.nih.gov/pubmed/34350008 http://dx.doi.org/10.1098/rsos.201598 © 2021 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. CC-BY R Soc Open Sci Ecology Conservation and Global Change Biology Text 2021 ftpubmed https://doi.org/10.1098/rsos.201598 2021-08-08T00:42:07Z 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. Text South Atlantic Ocean PubMed Central (PMC) Royal Society Open Science 8 7 201598 |
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topic |
Ecology Conservation and Global Change Biology |
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Ecology Conservation and Global Change Biology 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 |
topic_facet |
Ecology Conservation and Global Change Biology |
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. |
format |
Text |
author |
Romeu, Bianca Machado, Alexandre M. S. Daura-Jorge, Fábio G. Cremer, Marta J. de Moraes Alves, Ana Kássia Simões-Lopes, Paulo C. |
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://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ http://www.ncbi.nlm.nih.gov/pubmed/34350008 https://doi.org/10.1098/rsos.201598 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
R Soc Open Sci |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ http://www.ncbi.nlm.nih.gov/pubmed/34350008 http://dx.doi.org/10.1098/rsos.201598 |
op_rights |
© 2021 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
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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1766200221241442304 |