[MARMAM] New publication on burst pulses produced by Guiana dolphins (Sotalia guianensis)

Mariana Barbosa marib66 at gmail.com
Fri Feb 19 08:28:03 PST 2021

Dear Colleagues,

We are pleased to announce the publication of the following paper in the
Bioacoustics Journal:

Mariana Barbosa, Lis Bittencourt, Tatiana L. Bisi, José Lailson-Brito, and
Alexandre F. Azevedo (2021).  Characterisation and classification method of
burst pulses produced by Guiana dolphins (*Sotalia guianensis*)*. *


Although burst pulses are the least studied sounds produced by odontocetes,
their characterisation is essential to describe the acoustic repertoire of
a species. This study aimed to characterise burst pulses produced by Guiana
dolphins and propose a visual method to classify these sounds into
structural categories. Data collection occurred during boat surveys in
south-eastern Brazil. Five acoustic parameters were extracted: number of
pulses, dura- tion, interclick interval, click repetition rate, and minimum
fre- quency. All sounds were visually classified into four categories and
used in a discriminant function analysis. In addition, a K-means cluster
was used to compare the visual classification with this unsupervised
grouping method and confirm the repre- sentativeness of each category.
According to the discriminant ana- lysis, most sounds were correctly
classified (77%) into the four categories. Both methods grouped burst
pulses in similar patterns, confirming the use of the categories. Click
repetition rate was the most important parameter to separate categories.
The variation in this parameter could be related to different behaviours as
already suggested for other species. Thus, each category could have a
different function in Guiana dolphin communication. The visual
classification method is efficient and could be used for other spe- cies
that produce pulsed sounds.

Link to paper:
Contact e-mail: marib66 at gmail.com

Kind regards,
Mariana Barbosa
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