[MARMAM] New paper on the sound generating structures of Sousa plumbea and the directionality in dolphin sounds

Guilherme Frainer gui.frainer at gmail.com
Tue Nov 13 07:09:52 PST 2018

Hello there,

We are happy to share our recent publication in The Anatomical Record:

Frainer, G. , Plön, S. , Serpa, N. B., Moreno, I. B. and Huggenberger, S.
(2018), Sound Generating Structures of the Humpback Dolphin *Sousa
plumbea* (Cuvier,
1829) and the Directionality in Dolphin Sounds. Anat. Rec.. . doi:
10.1002/ar.23981 <https://doi.org/10.1002/ar.23981>

You can get full access here: https://rdcu.be/bbi8p

The macroscopic morphology of structures involved in sound generation in
the Indian Ocean humpback dolphin (*Sousa plumbea*) were described for the
first time using computed tomography imaging and standard gross dissection
techniques. The Indian Ocean humpback dolphin may represent a useful
comparative model to the bottlenose dolphin (*Tursiops* sp.) to provide
insights into the functional anatomy of the sound production in dolphins,
since these coastal dolphins exhibit similar body size and share
similarities on acoustic behavior. The general arrangement of sound
generating structures, that is, air sacs and muscles, was similar in both
the bottlenose dolphin and the Indian Ocean humpback dolphin. The main
difference between the two species existed in a small left posterior branch
of the melon in the Indian Ocean humpback dolphin*,* which was not found in
the bottlenose dolphin and might reflect an adaptation of directionality
for high frequency communication sounds as seen in some other delphinids
(e.g., *Lagenorhynchus* sp., *Grampus griseus*). Thus, this may be the main
reason for the asymmetry of the sound production structures in dolphins.
Additionally, the longer rostrum in Indian Ocean humpback dolphins might
suggest a more directional echolocation beam compared to the Lahille's
bottlenose dolphin. Anat Rec, 2018. © 2018 Wiley Periodicals, Inc.

*Guilherme Frainer *

Programa de Pós-Graduação em Biologia Animal (PPGBAN/UFRGS). Departamento
De Zoologia. Universidade Federal do Rio Grande do Sul.

Centro de Estudos Costeiros, Limnológicos e Marinhos (CECLIMAR/UFRGS).
Universidade Federal do Rio Grande do Sul.

de vírus. www.avg.com
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