[MARMAM] New publication in Ethology

Bianca Romeu romeu.bianca at gmail.com
Sat Sep 16 15:54:19 PDT 2017

Dear MARMAM readers,

We are pleased to announce the article “Bottlenose dolphins that forage
with artisanal fishermen whistle differently” that was recently published
in Ethology.

Romeu B, Cantor M, Bezamat C, Simões-Lopes PC, Daura-Jorge FG. Bottlenose
dolphins that forage with artisanal fishermen whistle differently. Ethology
. 2017;00:1–10. https://doi.org/10.1111/eth.12665


Acoustic communication is a taxonomically widespread phenomenon, crucial
for social animals. We evaluate social sounds from bottlenose dolphins
truncatus*) of Laguna, southern Brazil, whose social structure is organized
around a cooperative foraging tactic with artisanal fishermen. This tactic
involves stereotyped and coordinated behaviour by dolphins and fishermen
and is performed by a subset of the dolphin population, splitting it into
two distinct social communities. We compared the acoustic parameters and
type of whistles emitted by dolphins of the “non-cooperative” and
“cooperative” communities, both during their interactions with fishermen
and in times where dolphins were engaged in other types of foraging. Our
findings show how dolphins’ social sounds differ between foraging tactics
and social communities. The frequencies of six whistle types (ascending,
descending, concave, convex, multiple, flat) were significantly dependent
on tactics and communities. Ascending whistles weremore common than
expected during foraging without fishermen, and among dolphins of the
non-cooperative community. Whistle acoustic parameters (duration,
number of inclination
changes and inflection points, and initial, final, maximum, minimum
frequencies) also varied between social communities. In general, whistles
emitted by cooperative dolphins, mainly when not interacting with
fishermen, tended to be shorter, had higher frequency and more inflections
than those emitted by non-cooperative dolphins. These results suggest that
different whistles may convey specific information among dolphins related
to foraging, which we hypothesize promote social cohesion among members of
the same social community. These differences in acoustic repertoires add a
new dimension of complexity to this unique human–animal interaction.

Full text is available at:


Or send an e-mail to:

romeu.bianca at gmail.com

Best regards,

Bianca Romeu

*Bianca Romeu *
CRBio 88562/03-D

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