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The effects of visual impediment on the approaching behavior of harbor porpoise, Phocoena phocoena

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Title: The effects of visual impediment on the approaching behavior of harbor porpoise, Phocoena phocoena
Authors: Maezawa, Tomoki Browse this author
Matsuishi, Takashi Browse this author →KAKEN DB
Ito, Kiyohide Browse this author →KAKEN DB
Kaji, Seiichi Browse this author
Tsunokawa, Masatoshi Browse this author
Kawahara, Jun I Browse this author →KAKEN DB
Keywords: locomotion
swimming trajectory
time-to-contact
visual deprivation
visual guidance
Issue Date: 3-Jul-2019
Publisher: 日本哺乳類学会(The Mammal Society of Japan.)
Journal Title: Mammal study
Volume: 44
Issue: 3
Start Page: 205
End Page: 213
Publisher DOI: 10.3106/ms2019-0012
Abstract: Studies on odontocetes (e.g., porpoises) have revealed that these animals may adaptively use vision. The present study examined the contributions of vision to the approaching behavior of the harbor porpoise (Phocoena phocoena). When a porpoise approached a target, the time-to-contact perceived by the animal and its trajectory with a visual impediment condition were compared with those in the control (no impediment) condition. The results suggested that approaching behavior to a stationary target was guided by the animal's evaluation of time-to-contact (tau), maintaining the time derivative of tau ((tau) Over dot) at a constant value. A porpoise with visual deprivation exhibited grater (tau) Over dot) value and a longer evaluation time before contact than a porpoise that was not blindfolded in the task of reaching for the target. Furthermore, the porpoise with a visual impediment changed its swimming trajectory toward a target less than the control, which appeared to adaptively adjust its approaching trajectory. These findings imply that the use of vision aided echolocation and enables precise control and alteration of the trajectory during the approach. The present study has implications for adaptive use of vision during approaching behavior in the harbor porpoise.
Type: article
URI: http://hdl.handle.net/2115/78809
Appears in Collections:文学院・文学研究院 (Graduate School of Humanities and Human Sciences / Faculty of Humanities and Human Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河原 純一郎

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