Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts?
Author Posting. © Acoustical Society of America, 2008. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 124 (2008): 4059-4068, doi:10.1121/1.294515...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/2731 2023-05-15T17:59:09+02:00 Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? Hansen, Michael Wahlberg, Magnus Madsen, Peter T. 2008-12 application/pdf https://hdl.handle.net/1912/2731 en_US eng Acoustical Society of America https://doi.org/10.1121/1.2945154 Journal of the Acoustical Society of America 124 (2008): 4059-4068 https://hdl.handle.net/1912/2731 doi:10.1121/1.2945154 Journal of the Acoustical Society of America 124 (2008): 4059-4068 doi:10.1121/1.2945154 Bioacoustics Mechanoception Underwater sound Zoology Article 2008 ftwhoas https://doi.org/10.1121/1.2945154 2022-05-28T22:57:42Z Author Posting. © Acoustical Society of America, 2008. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 124 (2008): 4059-4068, doi:10.1121/1.2945154. Underwater sound signals for biosonar and communication normally have different source properties to serve the purposes of generating efficient acoustic backscatter from small objects or conveying information to conspecifics. Harbor porpoises (Phocoena phocoena) are nonwhistling toothed whales that produce directional, narrowband, high-frequency (HF) echolocation clicks. This study tests the hypothesis that their 130 kHz HF clicks also contain a low-frequency (LF) component more suited for communication. Clicks from three captive porpoises were analyzed to quantify the LF and HF source properties. The LF component is 59 (S.E.M=1.45 dB) dB lower than the HF component recorded on axis, and even at extreme off-axis angles of up to 135°, the HF component is 9 dB higher than the LF component. Consequently, the active space of the HF component will always be larger than that of the LF component. It is concluded that the LF component is a by-product of the sound generator rather than a dedicated pulse produced to serve communication purposes. It is demonstrated that distortion and clipping in analog tape recorders can explain some of the prominent LF components reported in earlier studies, emphasizing the risk of erroneous classification of sound types based on recording artifacts. This work was supported by the Carlsberg Foundation and Oticon, and via a Steno Scholarship from the Danish Natural Science Research Council to PTM. Article in Journal/Newspaper Phocoena phocoena toothed whales Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) The Journal of the Acoustical Society of America 124 6 4059 4068 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Bioacoustics Mechanoception Underwater sound Zoology |
spellingShingle |
Bioacoustics Mechanoception Underwater sound Zoology Hansen, Michael Wahlberg, Magnus Madsen, Peter T. Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
topic_facet |
Bioacoustics Mechanoception Underwater sound Zoology |
description |
Author Posting. © Acoustical Society of America, 2008. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 124 (2008): 4059-4068, doi:10.1121/1.2945154. Underwater sound signals for biosonar and communication normally have different source properties to serve the purposes of generating efficient acoustic backscatter from small objects or conveying information to conspecifics. Harbor porpoises (Phocoena phocoena) are nonwhistling toothed whales that produce directional, narrowband, high-frequency (HF) echolocation clicks. This study tests the hypothesis that their 130 kHz HF clicks also contain a low-frequency (LF) component more suited for communication. Clicks from three captive porpoises were analyzed to quantify the LF and HF source properties. The LF component is 59 (S.E.M=1.45 dB) dB lower than the HF component recorded on axis, and even at extreme off-axis angles of up to 135°, the HF component is 9 dB higher than the LF component. Consequently, the active space of the HF component will always be larger than that of the LF component. It is concluded that the LF component is a by-product of the sound generator rather than a dedicated pulse produced to serve communication purposes. It is demonstrated that distortion and clipping in analog tape recorders can explain some of the prominent LF components reported in earlier studies, emphasizing the risk of erroneous classification of sound types based on recording artifacts. This work was supported by the Carlsberg Foundation and Oticon, and via a Steno Scholarship from the Danish Natural Science Research Council to PTM. |
format |
Article in Journal/Newspaper |
author |
Hansen, Michael Wahlberg, Magnus Madsen, Peter T. |
author_facet |
Hansen, Michael Wahlberg, Magnus Madsen, Peter T. |
author_sort |
Hansen, Michael |
title |
Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
title_short |
Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
title_full |
Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
title_fullStr |
Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
title_full_unstemmed |
Low-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
title_sort |
low-frequency components in harbor porpoise (phocoena phocoena) clicks : communication signal, by-products, or artifacts? |
publisher |
Acoustical Society of America |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/2731 |
genre |
Phocoena phocoena toothed whales |
genre_facet |
Phocoena phocoena toothed whales |
op_source |
Journal of the Acoustical Society of America 124 (2008): 4059-4068 doi:10.1121/1.2945154 |
op_relation |
https://doi.org/10.1121/1.2945154 Journal of the Acoustical Society of America 124 (2008): 4059-4068 https://hdl.handle.net/1912/2731 doi:10.1121/1.2945154 |
op_doi |
https://doi.org/10.1121/1.2945154 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
124 |
container_issue |
6 |
container_start_page |
4059 |
op_container_end_page |
4068 |
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