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- W3174774568 abstract "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, ≃20 m for the MPBW. The measurements show that these BW calls series are stereotyped in frequency, amplitude, and depth." @default.
- W3174774568 created "2021-07-05" @default.
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- W3174774568 date "2021-06-01" @default.
- W3174774568 modified "2023-09-27" @default.
- W3174774568 title "Source level and vocalizing depth estimation of two blue whale subspecies in the western Indian Ocean from single sensor observations" @default.
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- W3174774568 doi "https://doi.org/10.1121/10.0005281" @default.
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