[MARMAM] New publication on blue whale source levels and vocalizing depths

Léa Bouffaut lea.bouffaut at ntnu.no
Mon Jun 28 06:06:58 PDT 2021

On behalf of my co-authors,

I am thrilled to announce the publication of our new paper, "Source level and vocalizing depth estimation of two blue whale subspecies in the western Indian Ocean from single sensor observations".

Léa Bouffaut<https://asa.scitation.org/author/Bouffaut%2C+L%C3%A9a><mailto:lea.bouffaut at ntnu.no>, Martin Landrø<https://asa.scitation.org/author/Landr%C3%B8%2C+Martin>, and <https://orcid.org/0000-0003-1430-7014> John R. Potter<https://asa.scitation.org/author/Potter%2C+John+R>
 "Source level and vocalizing depth estimation of two blue whale subspecies in the western Indian Ocean from single sensor observations",
The Journal of the Acoustical Society of America 149, 4422-4436 (2021)

Please feel free to email me for a pdf copy at lea.bouffaut at ntnu.no

The source level (SL) and vocalizing source depth (SD) of individuals from two blue whale (BW) subspecies, an Antarctic blue whale (Balaenoptera musculus intermedia; ABW) and a Madagascar pygmy blue whale (Balaenoptera musculus brevicauda; MPBW) are estimated from a single bottom-mounted hydrophone in the western Indian Ocean. Stereotyped units (male) are automatically detected and the range is estimated from the time delay between the direct and lowest-order multiply-reflected acoustic paths (multipath-ranging). Allowing for geometric spreading and the Lloyd's mirror effect (range-, depth-, and frequency-dependent) SL and SD are estimated by minimizing the SL variance over a series of units from the same individual over time (and hence also range). The average estimated SL of 188.5 ± 2.1 dB re. 1μPa measured between [25–30] Hz for the ABW and 176.8 ± 1.8 dB re. 1μPa measured between [22–27] Hz for the MPBW agree with values published for other geographical areas. Units were vocalized at estimated depths of 25.0 ± 3.7 and 32.7 ± 5.7 m for the ABW Unit A and C and, ~20m for the MPBW. The measurements show that these BW calls series are stereotyped in frequency, amplitude, and depth.


Léa Bouffaut

Post-doctoral fellow, Ph.D.
Norwegian University of Science and Technology
Department of Electronic Systems
O.S. Bragstads plass 2b | Gløshaugen, Trondheim

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