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Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey

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Title: Diving behavior of sei whales Balaenoptera borealis relative to the vertical distribution of their potential prey
Authors: Ishii, Midori Browse this author
Murase, Hiroto Browse this author
Fukuda, Yoshiaki Browse this author
Sawada, Kouichi Browse this author
Sasakura, Toyoki Browse this author
Tamura, Tsutomu Browse this author
Bando, Takeharu Browse this author
Matsuoka, Koji Browse this author
Shinohara, Akira Browse this author
Nakatsuka, Sayaka Browse this author
Katsumata, Nobuhiro Browse this author
Okazaki, Makoto Browse this author
Miyashita, Kazushi Browse this author →KAKEN DB
Mitani, Yoko Browse this author →KAKEN DB
Keywords: baleen whales
Issue Date: Dec-2017
Publisher: The Mammal Society of Japan
Journal Title: Mammal study
Volume: 42
Issue: 4
Start Page: 191
End Page: 199
Publisher DOI: 10.3106/041.042.0403
Abstract: 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.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 三谷 曜子

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