Abstract
Possible communication between territorial male Weddell seals (Leptonychotes weddellii) under the ice with females on the ice was investigated. In-air and underwater recordings of underwater calls were made at three locations near Davis, Antarctica. Most underwater calls were not detectable in air, often because of wind noise. In-air call amplitudes of detectable calls ranged from 32–74 dB re. 20 μPa at 86 Hz down to 4–38 dB re. 20 μPa at 3.6 kHz. Most of these would be audible to humans. Only 26 of 582 amplitude measurements (from 230 calls) ranged from 5 dB to a maximum of 15 dB above the minimum harbour-seal (Phoca vitulina) in-air detection threshold. Seals on the ice could likely hear a few very loud underwater calls but only if the caller was nearby and there were no wind noises. The low detectability of underwater calls in air likely precludes effective communication between underwater seals and those on the ice.
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References
ISO (1961) Normal equal-loudness contours for pure tones and normal threshold of hearing under free field listening conditions. ISO/R 226-1961 (E). International Organization for Standardization, Switzerland
Kastak D, Schusterman RJ (1998) Low-frequency amphibious hearing in pinnipeds: methods, measurements, noise, and ecology. J Acoust Soc Am 103:2216–2228
Kooyman GL (1981) Weddell seal: consumate diver. Cambridge University Press, New York
Møhl B (1968) Auditory sensitivity of the common seal in air and water. J Audiol Res 8:27–38
Oetelaar ML, Terhune JM, Burton HR (2003) Can the sex of a Weddell seal (Leptonychotes weddellii) be identified by its surface call? Aquat Mammal 29:261–267
Pahl BC, Terhune JM, Burton HR (1997) Repertoire and geographic variation in underwater vocalisations of Weddell seals (Leptonychotes weddellii, Pinnipedia: Phocidae) at the Vestfold Hills, Antarctica. Aust J Zool 45:171–187
Riedman M (1990) The pinnipeds: seals, sealions, and walruses. University of California Press, Berkley
Terhune JM (1991) Masked and unmasked pure tone detection thresholds of a harbour seal listening in air. Can J Zool 69:2059–2066
Terhune JM, Ronald K (1971) The harp seal, Pagophilus groenlandicus (Erxleben, 1777). X. The air audiogram. Can J Zool 49:385–390
Thomas JA, Kuechle VB (1982) Quantitative analysis of Weddell seal (Leptonychotes weddelli) underwater vocalizations at McMurdo Sound, Antarctica. J Acoust Soc Am 72:1730–1738
Thomas JA, Ferm LM, Kuechle VB (1988) Patterns of underwater calls from Weddell seals (Leptonychotes weddellii) during the breeding season at McMurdo Sound, Antarctica. Antarct J 23:146–148
Wolski LF, Anderson RC, Bowles AE, Yochem PK (2003) Measuring hearing in the harbor seal (Phoca vitulina): comparison of behavioral and auditory brainstem response techniques. J Acoust Soc Am 113:629–637
Acknowledgements
The Australian Antarctic Division and the Natural Sciences and Engineering Research Council of Canada provided logistical support and funding. T. Cheesman, the Davis expeditioners of 1997, and H. Burton are thanked for their assistance.
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Terhune, J.M. Through-ice communication by Weddell seals may not be practicable. Polar Biol 27, 810–812 (2004). https://doi.org/10.1007/s00300-004-0659-4
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DOI: https://doi.org/10.1007/s00300-004-0659-4