Highly Directional Sonar Beam of Narwhals (Monodon monoceros) Measured with a Vertical 16 Hydrophone Array

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2016
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Stilz, Peter
Rasmussen, Marianne H.
Laidre, Kristin L.
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PLoS one. Public Library of Science (PLoS). 2016, 11(11), e0162069. eISSN 1932-6203. Available under: doi: 10.1371/journal.pone.0162069
Zusammenfassung

Recordings of narwhal (Monodon monoceros) echolocation signals were made using a linear 16 hydrophone array in the pack ice of Baffin Bay, West Greenland in 2013 at eleven sites. An average -3 dB beam width of 5.0° makes the narwhal click the most directional biosonar signal reported for any species to date. The beam shows a dorsal-ventral asymmetry with a narrower beam above the beam axis. This may be an evolutionary advantage for toothed whales to reduce echoes from the water surface or sea ice surface. Source level measurements show narwhal click intensities of up to 222 dB pp re 1 μPa, with a mean apparent source level of 215 dB pp re 1 μPa. During ascents and descents the narwhals perform scanning in the vertical plane with their sonar beam. This study provides valuable information for reference sonar parameters of narwhals and for the use of acoustic monitoring in the Arctic.

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570 Biowissenschaften, Biologie
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ISO 690KOBLITZ, Jens C., Peter STILZ, Marianne H. RASMUSSEN, Kristin L. LAIDRE, 2016. Highly Directional Sonar Beam of Narwhals (Monodon monoceros) Measured with a Vertical 16 Hydrophone Array. In: PLoS one. Public Library of Science (PLoS). 2016, 11(11), e0162069. eISSN 1932-6203. Available under: doi: 10.1371/journal.pone.0162069
BibTex
@article{Koblitz2016Highl-50723,
  year={2016},
  doi={10.1371/journal.pone.0162069},
  title={Highly Directional Sonar Beam of Narwhals (Monodon monoceros) Measured with a Vertical 16 Hydrophone Array},
  number={11},
  volume={11},
  journal={PLoS one},
  author={Koblitz, Jens C. and Stilz, Peter and Rasmussen, Marianne H. and Laidre, Kristin L.},
  note={Article Number: e0162069}
}
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