PMID: 15376691Sep 21, 2004Paper

Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls

The Journal of the Acoustical Society of America
Hilary B Moors, John M Terhune

Abstract

Many vocalizations produced by Weddell seals (Leptonychotes weddellii) are made up of repeated individual distinct sounds (elements). Patterning of multiple element calls was examined during the breeding season at Casey and Davis, Antarctica. Element and interval durations were measured from 405 calls all > 3 elements in length. The duration of the calls (22+/-16.6 s) did not seem to vary with an increasing number of elements (F4,404=1.83,p = 0.122) because element and interval durations decreased as the number of elements within a call increased. Underwater vocalizations showed seven distinct timing patterns of increasing, decreasing, or constant element and interval durations throughout the calls. One call type occurred with six rhythm patterns, although the majority exhibited only two rhythms. Some call types also displayed steady frequency changes as they progressed. Weddell seal multiple element calls are rhythmically repeated and thus the durations of the elements and intervals within a call occur in a regular manner. Rhythmical repetition used during vocal communication likely enhances the probability of a call being detected and has important implications for the extent to which the seals can successfully transmit infor...Continue Reading

References

Dec 1, 1982·The Journal of the Acoustical Society of America·J A Thomas, V B Kuechle
Jun 30, 2000·The Journal of the Acoustical Society of America·G PavanJ Gordon
Feb 24, 2001·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·B RonacherR M Hennig
Mar 10, 2001·Current Opinion in Neurobiology·G Pollack
Jan 2, 2003·The Journal of the Acoustical Society of America·Arturo Serrano, John M Terhune
Apr 22, 2003·The Journal of the Acoustical Society of America·Todd M FreebergBarbara Clucas

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Citations

Oct 31, 2018·PloS One·Gregg A CastellucciDavid McCormick
Jan 1, 2021·The Journal of the Acoustical Society of America·Paul A CzikoJohn M Terhune

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