title: Ultrasonic whistles of killer whales (Orcinus orca) recorded in the North Pacific (L).
abstract: Ultrasonic whistles were previously found in North Atlantic killer whales and were suggested to occur in eastern North Pacific killer whales based on the data from autonomous recorders. In this study ultrasonic whistles were found in the recordings from two encounters with the eastern North Pacific offshore ecotype killer whales and one encounter with the western North Pacific killer whales of unknown ecotype. All ultrasonic whistles were highly stereotyped and all but two had downsweep contours. These results demonstrate that specific sound categories can be shared by killer whales from different ocean basins.
authors.affiliation: Department of Vertebrate Zoology, Faculty of Biology, Moscow State University, Moscow, 119992, Russia. alazor@rambler.ru
authors.forename: Olga A
authors.initials: OA
authors.lastname: Filatova
authors.forename: John K B
authors.initials: JK
authors.lastname: Ford
authors.forename: Craig O
authors.initials: CO
authors.lastname: Matkin
authors.forename: Lance G
authors.initials: LG
authors.lastname: Barrett-Lennard
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Burdin
authors.forename: Erich
authors.initials: E
authors.lastname: Hoyt
mesh_terms: D000818:Animals; D008297:Male; D010140:Pacific Ocean; D063346:Singing; D013018:Sound Spectrography; D014465:Ultrasonics; D050685:Whale, Killer / Q000502:physiology*