Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey
In this study, we investigated the diving behavior of sei whales relative to the vertical -distribution of their potential prey in the western North Pacific during the summer of 2013. Acoustic time-depth transmitters were attached to two sei whales for 10.2 and 32.0 h, respectively. The vertical dis...
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Online Access: | http://hdl.handle.net/2115/72274 https://doi.org/10.3106/041.042.0403 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/72274 2023-05-15T15:36:15+02:00 Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey Ishii, Midori Murase, Hiroto Fukuda, Yoshiaki Sawada, Kouichi Sasakura, Toyoki Tamura, Tsutomu Bando, Takeharu Matsuoka, Koji Shinohara, Akira Nakatsuka, Sayaka Katsumata, Nobuhiro Okazaki, Makoto Miyashita, Kazushi Mitani, Yoko http://hdl.handle.net/2115/72274 https://doi.org/10.3106/041.042.0403 eng eng The Mammal Society of Japan http://hdl.handle.net/2115/72274 Mammal study, 42(4): 191-199 http://dx.doi.org/10.3106/041.042.0403 baleen whales biologging cetacean foraging habitat article fthokunivhus https://doi.org/10.3106/041.042.0403 2022-11-18T01:04:35Z In this study, we investigated the diving behavior of sei whales relative to the vertical -distribution of their potential prey in the western North Pacific during the summer of 2013. Acoustic time-depth transmitters were attached to two sei whales for 10.2 and 32.0 h, respectively. The vertical distribution and density (expressed as the volume backscattering strength, SV) of their potential prey were recorded by an echosounder. Diving behavior was classified into two shapes: U-shaped and V-shaped. For both individuals, U-shaped diving was associated with higher SV values than V-shaped diving and the frequency of U-shaped diving increased from late afternoon until sunset. During the daytime, dense scattering layers (presumably zooplankton) were distributed at approximately 40 m and they then migrated toward the surface around sunset. The diving depth of the whales followed the diel migration of the scattering layers and the diving was concentrated in these layers when the density became high. The results of this study indicate that sei whales change their diving depth and shapes in response to the diel vertical migration of their potential prey. Article in Journal/Newspaper Balaenoptera borealis baleen whales Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Pacific Mammal Study 42 4 1 9 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
baleen whales biologging cetacean foraging habitat |
spellingShingle |
baleen whales biologging cetacean foraging habitat Ishii, Midori Murase, Hiroto Fukuda, Yoshiaki Sawada, Kouichi Sasakura, Toyoki Tamura, Tsutomu Bando, Takeharu Matsuoka, Koji Shinohara, Akira Nakatsuka, Sayaka Katsumata, Nobuhiro Okazaki, Makoto Miyashita, Kazushi Mitani, Yoko Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
topic_facet |
baleen whales biologging cetacean foraging habitat |
description |
In this study, we investigated the diving behavior of sei whales relative to the vertical -distribution of their potential prey in the western North Pacific during the summer of 2013. Acoustic time-depth transmitters were attached to two sei whales for 10.2 and 32.0 h, respectively. The vertical distribution and density (expressed as the volume backscattering strength, SV) of their potential prey were recorded by an echosounder. Diving behavior was classified into two shapes: U-shaped and V-shaped. For both individuals, U-shaped diving was associated with higher SV values than V-shaped diving and the frequency of U-shaped diving increased from late afternoon until sunset. During the daytime, dense scattering layers (presumably zooplankton) were distributed at approximately 40 m and they then migrated toward the surface around sunset. The diving depth of the whales followed the diel migration of the scattering layers and the diving was concentrated in these layers when the density became high. The results of this study indicate that sei whales change their diving depth and shapes in response to the diel vertical migration of their potential prey. |
format |
Article in Journal/Newspaper |
author |
Ishii, Midori Murase, Hiroto Fukuda, Yoshiaki Sawada, Kouichi Sasakura, Toyoki Tamura, Tsutomu Bando, Takeharu Matsuoka, Koji Shinohara, Akira Nakatsuka, Sayaka Katsumata, Nobuhiro Okazaki, Makoto Miyashita, Kazushi Mitani, Yoko |
author_facet |
Ishii, Midori Murase, Hiroto Fukuda, Yoshiaki Sawada, Kouichi Sasakura, Toyoki Tamura, Tsutomu Bando, Takeharu Matsuoka, Koji Shinohara, Akira Nakatsuka, Sayaka Katsumata, Nobuhiro Okazaki, Makoto Miyashita, Kazushi Mitani, Yoko |
author_sort |
Ishii, Midori |
title |
Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
title_short |
Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
title_full |
Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
title_fullStr |
Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
title_full_unstemmed |
Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey |
title_sort |
diving behavior of sei whales balaenoptera borealis relative to the vertical distribution of their potential prey |
publisher |
The Mammal Society of Japan |
url |
http://hdl.handle.net/2115/72274 https://doi.org/10.3106/041.042.0403 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Balaenoptera borealis baleen whales |
genre_facet |
Balaenoptera borealis baleen whales |
op_relation |
http://hdl.handle.net/2115/72274 Mammal study, 42(4): 191-199 http://dx.doi.org/10.3106/041.042.0403 |
op_doi |
https://doi.org/10.3106/041.042.0403 |
container_title |
Mammal Study |
container_volume |
42 |
container_issue |
4 |
container_start_page |
1 |
op_container_end_page |
9 |
_version_ |
1766366596525195264 |