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Source level estimation of two blue whale subspecies in southwestern Indian Ocean
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10.1121/1.3409479
/content/asa/journal/jasa/127/6/10.1121/1.3409479
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/6/10.1121/1.3409479

Figures

Image of FIG. 1.
FIG. 1.

Location of the hydroacoustic station of the IMS near Crozet Islands.

Image of FIG. 2.
FIG. 2.

Spectrograms of (a) two Antarctic blue whale calls and (b) one pygmy blue whale “Madagascar” type call, recorded on the hydroacoustic station of the International Monitoring System (spectrogram parameters: FFT 1024 points, 93.75% overlap, Hanning window).

Image of FIG. 3.
FIG. 3.

Antarctic blue whale: (a) interval intercalls for the complete hour of record and (b) received levels (S1: dark, S2: white, and S3: gray) for the four sequences of calls retained for the tracking.

Image of FIG. 4.
FIG. 4.

Antarctic blue whale: (a) track of a single blue whale moving through the study area. Whale calls were repeatedly located by time-of-arrival differences at the hydrophones (each point represent location of calling whale deduced from TDOA/hyperbolic methods). (b) Plot of Antarctic blue whale received levels versus calculated range (best fit and errors at 95%).

Image of FIG. 5.
FIG. 5.

Pygmy blue whale: (a) interval intercalls for the 2 consecutive h of record and (b) received levels (S1: dark, S2: white, and S3: gray) for the sequences of calls retained for the tracking.

Image of FIG. 6.
FIG. 6.

Pygmy blue whale: (a) track of a single blue whale moving through the study area. Whale calls were repeatedly located by time-of-arrival differences at the hydrophones (each point represent location of calling whale deduced from TDOA/hyperbolic methods). (b) Plot of pygmy blue whale received levels versus calculated range (best fit and errors at 95%).

Tables

Generic image for table
TABLE I.

Maximum theoretical TDOA of a signal between multiple pairs of instruments that compose the hydroacoustic stations (H04S1, H04S2, and H04S3)

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/content/asa/journal/jasa/127/6/10.1121/1.3409479
2010-06-09
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Source level estimation of two blue whale subspecies in southwestern Indian Ocean
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/6/10.1121/1.3409479
10.1121/1.3409479
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