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Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues

Dall’s porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited. To evaluate the mechanism of click emission in the head of this porpoise, the distribution of acoustic impedance in head tissues was calculated usi...

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Autores principales: Kuroda, Mika, Sasaki, Motoki, Yamada, Kazutaka, Miki, Nobuhiro, Matsui, Natsuki, Matsuishi, Takashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6138359/
https://www.ncbi.nlm.nih.gov/pubmed/30216345
http://dx.doi.org/10.1371/journal.pone.0202426
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author Kuroda, Mika
Sasaki, Motoki
Yamada, Kazutaka
Miki, Nobuhiro
Matsui, Natsuki
Matsuishi, Takashi
author_facet Kuroda, Mika
Sasaki, Motoki
Yamada, Kazutaka
Miki, Nobuhiro
Matsui, Natsuki
Matsuishi, Takashi
author_sort Kuroda, Mika
collection PubMed
description Dall’s porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited. To evaluate the mechanism of click emission in the head of this porpoise, the distribution of acoustic impedance in head tissues was calculated using density and Young’s modulus‘which is a measure of linear resistance to linear compression. Two Dall’s porpoise heads were examined: one for macroscopic dissection, and one for investigating the distribution of acoustic impedance calculated from CT-measured density, and Young’s modulus measured by creep meter. Acoustic impedance increased from the dorsal bursae to the melon’s emitting surface, with impedance matching observed at the boundary between the emitting surface and seawater, and was more similar in distribution to Young’s modulus than it was to density. The distribution of acoustic impedance differed from that of harbor porpoise (Phocoena phocoena), despite similarities in the sound-producing organs in the heads of Dall’s and harbor porpoises. A comparison of the physical properties of Dall’s and harbor porpoise head tissues suggests that hypertrophic vestibular sacs and an oval emitting surface are common characteristics in Phocoenidae.
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spelling pubmed-61383592018-09-27 Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues Kuroda, Mika Sasaki, Motoki Yamada, Kazutaka Miki, Nobuhiro Matsui, Natsuki Matsuishi, Takashi PLoS One Research Article Dall’s porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited. To evaluate the mechanism of click emission in the head of this porpoise, the distribution of acoustic impedance in head tissues was calculated using density and Young’s modulus‘which is a measure of linear resistance to linear compression. Two Dall’s porpoise heads were examined: one for macroscopic dissection, and one for investigating the distribution of acoustic impedance calculated from CT-measured density, and Young’s modulus measured by creep meter. Acoustic impedance increased from the dorsal bursae to the melon’s emitting surface, with impedance matching observed at the boundary between the emitting surface and seawater, and was more similar in distribution to Young’s modulus than it was to density. The distribution of acoustic impedance differed from that of harbor porpoise (Phocoena phocoena), despite similarities in the sound-producing organs in the heads of Dall’s and harbor porpoises. A comparison of the physical properties of Dall’s and harbor porpoise head tissues suggests that hypertrophic vestibular sacs and an oval emitting surface are common characteristics in Phocoenidae. Public Library of Science 2018-09-14 /pmc/articles/PMC6138359/ /pubmed/30216345 http://dx.doi.org/10.1371/journal.pone.0202426 Text en © 2018 Kuroda et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Kuroda, Mika
Sasaki, Motoki
Yamada, Kazutaka
Miki, Nobuhiro
Matsui, Natsuki
Matsuishi, Takashi
Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title_full Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title_fullStr Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title_full_unstemmed Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title_short Click emission in Dall’s porpoise Phocoenoides dalli, focusing on physical properties of tissues
title_sort click emission in dall’s porpoise phocoenoides dalli, focusing on physical properties of tissues
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6138359/
https://www.ncbi.nlm.nih.gov/pubmed/30216345
http://dx.doi.org/10.1371/journal.pone.0202426
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