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      Observations and Bayesian location methodology of transient acoustic signals (likely blue whales) in the Indian Ocean, using a hydrophone triplet

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      The Journal of the Acoustical Society of America
      Acoustical Society of America (ASA)

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          Blue and fin whale call source levels and propagation range in the Southern Ocean.

          Blue (Balaenoptera musculus) and fin whales (B. physalus) produce high-intensity, low-frequency calls, which probably function for communication during mating and feeding. The source levels of blue and fin whale calls off the Western Antarctic Peninsula were calculated using recordings made with calibrated, bottom-moored hydrophones. Blue whales were located up to a range of 200 km using hyperbolic localization and time difference of arrival. The distance to fin whales, estimated using multipath arrivals of their calls, was up to 56 km. The error in range measurements was 3.8 km using hyperbolic localization, and 3.4 km using multipath arrivals. Both species produced high-intensity calls; the average blue whale call source level was 189+/-3 dB re:1 microPa-1 m over 25-29 Hz, and the average fin whale call source level was 189+/-4 dB re:1 microPa-1 m over 15-28 Hz. Blue and fin whale populations in the Southern Ocean have remained at low numbers for decades since they became protected; using source level and detection range from passive acoustic recordings can help in calculating the relative density of calling whales.
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            EVIDENCE FOR INCREASES IN ANTARCTIC BLUE WHALES BASED ON BAYESIAN MODELLING

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              Principles of Marine Bioacoustics

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                Author and article information

                Journal
                The Journal of the Acoustical Society of America
                The Journal of the Acoustical Society of America
                Acoustical Society of America (ASA)
                0001-4966
                May 2016
                May 2016
                : 139
                : 5
                : 2656-2667
                Article
                10.1121/1.4948758
                1289c307-a423-4e6e-bc3f-785d9dd0cbe7
                © 2016
                History

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