[MARMAM] new paper on passive acoustic monitoring through the use of a wave glider

Lis Bittencourt lis.bitt at gmail.com
Tue Nov 6 09:36:04 PST 2018


Dear colleagues,

I am pleased to anounce the publication of our recent work on Deep-Sea
Research Part I:

“Mapping cetacean sounds using a passive acoustic monitoring system towed
by an autonomous Wave Glider in the Southwestern Atlantic Ocean”

Lis Bittencourt, William Soares-Filho, Isabela Maria Seabra de Lima, Sudhir
Pai, Jose Lailson-BritoJr., Leonardo Martins Barreira, Alexandre Freitas
Azevedo, Luiz Alexandre A. Guerra

Abstract
Passive acoustic monitoring techniques provide a useful alternative to
visual surveys for monitoring of marine mammals since they are less
affected by adverse weather conditions. An autonomous unmanned Wave Glider,
equipped with a towed hydrophone and recording system was used to collect
acoustic data in the Brazilian offshore waters of the Southwestern Atlantic
Ocean between 6 and 25 February 2016. Nearly continuous data were obtained
during this period (light and dark hours) for the 750 km traveled. There
were 165,130 high-frequency detections in 31 encounters, including 1789
whistles, 389 burst-pulse sounds, and 162,952 echolocation clicks. A total
of 705 low-frequency tonal signals were recorded in 5 encounters. Although
high-frequency detections occurred at all hours of the day, the majority
occurred during dark hours. Low-frequency detections were not evenly spread
through all hours of the day, with the majority of them occurring during
dark hours. High-frequency and low-frequency detections represented 26% and
3% of the recording hours, respectively. Duration, the number of emissions,
and ocean depth varied among acoustic encounters. Encounters composed by
high-frequency sounds were separated into seven different groups, probably
different species. One of the encounters presented whistles that were
previously recorded in the Rio de Janeiro Coast for Steno bredanensis
(Rough-toothed dolphins). All of the low-frequency encounters were composed
of a type of Balaenoptera brydei (Bryde's whales) call. This type of data
collection is un-precedented for the Southwestern Atlantic Ocean and
highlighted the use of the sampled area by delphinids on different days and
different times of the day, including the dark hours.


The article pdf can be reached at:
https://www.sciencedirect.com/science/article/pii/S0967063718301614?via%3Dihub

Or e-mail me: lis.bitt at gmail.com

Best regards,

Lis Bittencourt
Laboratório de Mamíferos Aquáticos e Bioindicadores - MAQUA
Rio de Janeiro State University
-- 
Lis Bittencourt

Mestre em Oceanografia
Doutoranda no Programa de Pós-Graduação em Oceanografia - UERJ
Laboratório de Mamíferos Aquáticos e Bioindicadores - MAQUA
Universidade do Estado do Rio de Janeiro - UERJ
Rua São Francisco Xavier, 524, 4º andar - sala 4002 bloco E
Maracanã, Rio de Janeiro - RJ
CEP 20550-013
Tel: 21 2334-0795
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