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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ https://www.ncbi.nlm.nih.gov/pubmed/34350008 http://dx.doi.org/10.1098/rsos.201598 |
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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 |
collection | PubMed |
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 | Online Article Text |
id | pubmed-8316790 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-83167902021-08-03 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. R Soc Open Sci Ecology, Conservation and Global Change Biology 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. The Royal Society 2021-07-28 /pmc/articles/PMC8316790/ /pubmed/34350008 http://dx.doi.org/10.1098/rsos.201598 Text en © 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. |
spellingShingle | 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 |
title | 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_short | Low-frequency sampling rates are effective to record bottlenose dolphins |
title_sort | low-frequency sampling rates are effective to record bottlenose dolphins |
topic | Ecology, Conservation and Global Change Biology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8316790/ https://www.ncbi.nlm.nih.gov/pubmed/34350008 http://dx.doi.org/10.1098/rsos.201598 |
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