[MARMAM] New paper on echolocation of the Risso's dolphin
adambsmi at hawaii.edu
Sun Jan 10 15:43:28 PST 2016
We are happy to announce the publication of the following article in the
Journal of the Acoustical Society of America.
"Transmission beam characteristics of a Risso's dolphin"
by Adam B. Smith, Laura N. Kloepper, Wei-Cheng Yang, Wan-Hsiu Huang, I-Fan
Jen, Brendan P. Rideout, and Paul E. Nachtigall.
Abstract: The echolocation system of the Risso’s dolphin (Grampus griseus)
remains poorly studied compared to other odontocete species. In this study,
echolocation signals were recorded from a stationary Risso’s dolphin with
an array of 16 hydrophones and the two dimensional beam shape was explored
using frequency-dependent amplitude plots. Click source parameters were
similar to those already described for this species. Centroid frequency of
click signals increased with increasing sound pressure level, while the
beamwidth decreased with increasing center frequency. Analysis revealed
primarily single lobed, and occasionally vertically dual-lobed, beam
shapes. Overall beam directivity was found to be greater than that of the
harbor porpoise, bottlenose dolphin, and a false killer
whale. The relationship between frequency content, beam directivity, and
head size for this Risso’s dolphin deviated from the trend described for
other species. These are the first reported measurements of echolocation
beam shape and directivity in G. griseus. [
Adam B. Smith
Marine Mammal Research Program
Hawaii Institute of Marine Biology
University of Hawaii at Manoa
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