[MARMAM] NEW ARTICLE: Echolocation parameters of Australian humpback dolphins and Indo-Pacific bottlenose dolphins

Mafalda de Freitas mafalda.df at gmail.com
Tue Jun 23 03:07:45 PDT 2015

Dear MARMAM subscribers,

We are pleased to announce the publication of the following paper in the
Journal of the Acoustical Society of America.

de Freitas, M., Jensen, F.H., Tyne, J., Bejder, L., and Madsen, P.T. (2015)
”Echolocation parameters of Australian humpback dolphins (*Sousa sahulensis*)
and Indo-Pacific bottlenose dolphins (*Tursiops aduncus*) in the wild”. J.
Acoust. Soc. Am., 137:3033-3041.

ABSTRACT: Echolocation is a key sensory modality for toothed whale
orientation, navigation, and foraging. However, a more comparative
understanding of the biosonar properties of toothed whales is necessary to
understand behavioral and evolutionary adaptions. To address this, two
free-ranging sympatric delphinid species, Australian humpback dolphins (*Sousa
sahulensis*) and Indo-Pacific bottlenose dolphins (*Tursiops aduncus*),
were studied. Biosonar clicks from both species were recorded within the
same stretch of coastal habitat in Exmouth Gulf, Western Australia, using a
vertical seven element hydrophone array. *S. sahulensis* used biosonar
clicks with a mean source level of 199 6 3 dB re 1 lPa peak-peak (pp), mean
centroid frequency of 106 6 11 kHz, and emitted at interclick intervals
(ICIs) of 79 6 33 ms. These parameters were similar to click parameters of
sympatric *T. aduncus*, characterized by mean source levels of 204 6 4 dB
re 1 lPa pp, centroid frequency of 112 6 9 kHz, and ICIs of 73 6 29 ms.
These properties are comparable to those of other similar sized delphinids
and suggest that biosonar parameters are independent of sympatric
delphinids and possibly driven by body size. The dynamic biosonar behavior
of these delphinids may have, consequently, allowed for adaptations to
local environments through high levels of control over sonar beam

The article can be found at:


PDFs can be requested at mafalda.df at gmail.com


Mafalda de Freitas
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