[MARMAM] New publication on Araguaian river dolphin vocalizations

Gabriel Melo Alves dos Santos botogabriel at gmail.com
Mon Feb 10 05:01:33 PST 2020

Dr. Gabriel-Melo Santos
Scottish Oceans Institute, Sea Mammal Research Unit, School of Biology,
University of St Andrews

Dear all,

Please check our new publication "Repeated downsweep vocalizations of the
Araguaian river dolphin, Inia araguaiaensis""

Araguaian botos (Inia araguaiaensis) are known to produce pulsed as well as
tonal sounds. This study documents the first evidence for repetitive
sequences of downsweep whistles in botos that appear to be shared between
individuals, and the context of their occurrence is investigated. Boat
surveys were conducted along the Tocantins River located in the Eastern
Amazon over a period of 42 days between 2012 and 2018. Eighty-two groups of
Araguaian botos were observed, and 43 h of sound recordings were acquired.
632 downsweep whistles were recorded in 10 encounters. Four of these
encounters contained downsweep bouts (21 bouts with ≥2 whistles) with short
inter-call intervals (bout criterion 50 s) and up to 161 whistles. A
statistical relationship was not found between downsweep occurrence and any
of the contextual parameters that were investigated, including socializing,
travelling, feeding, group size, presence of calves, and socio-sexual
displays. The rarity of these signals makes them unlikely candidates for
individual or group identification. It is more likely that they are
associated with very specific contexts, such as nursing or mating, both of
which were rarely observed in this study. Further studies are required to
investigate context specificity and elucidate the function of these signals.

All the best,

Dr. Gabriel Melo-Santos

Post-doctoral Research Fellow
University of St Andrews
Scottish Oceans Institute
Sea Mammal Research Unit
BioMA - Biology and Conservation of Amazonian Aquatic Mammals

"(...) As we bandy round solution
celebrate our evolution
That antidotes our stations
And as we activate our nation
As we're joined by our companions
we ignite our generation
today (...)"
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