[MARMAM] New publication : Seasonal and Diel Vocalization Patterns of Antarctic Blue Whale in the Southern Indian Ocean

Emmanuelle Leroy emmanuelle.leroy at univ-brest.fr
Thu Nov 10 09:55:37 PST 2016

Dear colleagues,

We are pleased to announce the publication of a new paper in Plos One 
entitled : " Seasonal and Diel Vocalization Patterns of Antarctic Blue 
Whale (Balaenoptera musculus intermedia) in the Southern Indian Ocean: A 
Multi-Year and Multi-Site Study"

Passive acoustic monitoring is an efficient way to provide insights on 
the ecology of large whales. This approach allows for long-term and 
species-specific monitoring over large areas. In this study, we examined 
six years (2010 to 2015) of continuous acoustic recordings at up to 
seven different locations in the Central and Southern Indian Basin to 
assess the peak periods of presence, seasonality and migration movements 
of Antarctic blue whales (/Balaenoptera musculus intermedia/). An 
automated method is used to detect the Antarctic blue whale stereotyped 
call, known as Z-call. Detection results are analyzed in terms of 
distribution, seasonal presence and diel pattern of emission at each 
site. Z-calls are detected year-round at each site, except for one 
located in the equatorial Indian Ocean, and display highly seasonal 
distribution. This seasonality is stable across years for every site, 
but varies between sites. Z-calls are mainly detected during autumn and 
spring at the subantarctic locations, suggesting that these sites are on 
the Antarctic blue whale migration routes, and mostly during winter at 
the subtropical sites. In addition to these seasonal trends, there is a 
significant diel pattern in Z-call emission, with more Z-calls in 
daytime than in nighttime. This diel pattern may be related to the blue 
whale feeding ecology.

This article is available at : 

Kind regards,

Emmanuelle Leroy

PhD Student
University of Brest
Institut Universitaire Européen de la Mer (IUEM)
Laboratoire Géosciences Océan (LGO)
Place Nicolas Copernic - 29280 Plouzané

e-mail : emmanuelle.leroy at univ-brest.fr

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