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Harp seals do not increase their call frequencies when it gets noisier
Terhune, J.M.; Bosker, T. (2016). Harp seals do not increase their call frequencies when it gets noisier, in: Popper, A.N. et al. (Ed.) The effects of noise on aquatic life II. Advances in Experimental Medicine and Biology, 875: pp. 1149-1153. hdl.handle.net/10.1007/978-1-4939-2981-8_143
In: Popper, A.N.; Hawkins, A. (Ed.) (2016). The effects of noise on aquatic life II. Advances in Experimental Medicine and Biology, 875. Springer Science+Business Media, Inc: New York. ISBN 978-1-4939-2980-1. xxx, 1292 pp., more
In: Advances in Experimental Medicine and Biology. Springer: Berlin. ISSN 0065-2598, more
Peer reviewed article  

Available in  Authors 

Keywords
    Frequency shift; Pagophilus groenlandicus (Erxleben, 1777) [WoRMS]; Marine
Author keywords
    Harp seal; Underwater vocalizations; Antimasking

Authors  Top 
  • Terhune, J.M.
  • Bosker, T.

Abstract
    Some species avoid low-frequency masking by shifting their calls to higher frequencies. We addressed the hypothesis that Pagophilus groenlandicus (harp seals) will make more high-frequency underwater calls to avoid low-frequency conspecific masking as calling rates increase. The spectral shapes at high and low calling rates were compared (after equalizing the broadband amplitudes). There were no significant differences between the spectral shapes. Pagophilus groenlandicus do not alter the proportions of low- and high-frequency calls as it gets noisier. This suggests that they may not shift their calling frequencies when encountering low-frequency, broadband anthropogenic noise.

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