Echolocation clicks of free-ranging Chilean dolphins (Cephalorhynchus eutropia).
In this paper, evidence is provided that Chilean dolphins (Cephalorhynchus eutropia) produce ultrasonic echolocation clicks of the narrow-band high-frequency category. Echolocation clicks emitted during approaches of the hydrophones consisted only of narrow-band (rms-BW: 12.0 kHz) single pulses with mean centroid frequencies of about 126 kHz, peak frequencies of 126 kHz, and a 20 dB duration of 82.6 micros. The maximum received level measured exceeded 165 dB re 1 microPa. In addition, high repetition-rate buzzes were recorded during foraging behavior (click interval: 2 ms), but no whistles or calls with tonal components were detected.
Götz
Thomas
T
Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews KY16 8LB, United Kingdom. tg45@st-andrews.ac.uk
Antunes
Ricardo
R
Heinrich
Sonja
S
D000669:Amplifiers, Electronic; D000818:Animals; D002677:Chile; D004289:Dolphins / Q000502:physiology*; D004455:Echolocation; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014465:Ultrasonics; D014828:Vocalization, Animal