AI Article Synopsis
- Ultrasonic whistles, which were previously identified in North Atlantic killer whales, were also discovered in the eastern North Pacific and western North Pacific killer whales, indicating a broader occurrence than previously believed.
- The study documented these whistles in two encounters with eastern North Pacific offshore killer whales and one with western North Pacific killer whales of an unknown type.
- The ultrasonic whistles were characterized by being highly stereotyped, with most displaying downsweep contours, suggesting that certain sound patterns can be shared among killer whales in different ocean regions.
Article 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.
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| http://dx.doi.org/10.1121/1.4764874 | DOI Listing |
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