Caller sex and orientation influence spectral characteristics of “two-voice” stereotyped calls produced by free-ranging killer whales


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dc.contributor.author Miller, Patrick J. O.
dc.contributor.author Samarra, Filipa I. P.
dc.contributor.author Perthuison, Aurelie D.
dc.date.accessioned 2008-08-20T15:59:21Z
dc.date.available 2008-08-20T15:59:21Z
dc.date.issued 2007-06
dc.identifier.citation Journal of the Acoustical Society of America 121 (2007): 3932-3937 en
dc.identifier.uri http://hdl.handle.net/1912/2342
dc.description Author Posting. © Acoustical Society of America, 2007. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 121 (2007): 3932-3937, doi:10.1121/1.2722056. en
dc.description.abstract This study investigates how particular received spectral characteristics of stereotyped calls of sexually dimorphic adult killer whales may be influenced by caller sex, orientation, and range. Calls were ascribed to individuals during natural behavior using a towed beamforming array. The fundamental frequency of both high-frequency and low-frequency components did not differ consistently by sex. The ratio of peak energy within the fundamental of the high-frequency component relative to summed peak energy in the first two low-frequency component harmonics, and the number of modulation bands off the high-frequency component, were significantly greater when whales were oriented towards the array, while range and adult sex had little effect. In contrast, the ratio of peak energy in the first versus second harmonics of the low-frequency component was greater in calls produced by adult females than adult males, while orientation and range had little effect. The dispersion of energy across harmonics has been shown to relate to body size or sex in terrestrial species, but pressure effects during diving are thought to make such a signal unreliable in diving animals. The observed spectral differences by signaler sex and orientation suggest that these types of information may be transmitted acoustically by freely diving killer whales. en
dc.description.sponsorship Funding was provided by WHOI’s Rinehart Coastal Research Center and Ocean Ventures Fund, and a Royal Society USA/Canada fellowship to PJOM. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Acoustical Society of America en
dc.relation.uri http://dx.doi.org/10.1121/1.2722056
dc.subject Bioacoustics en
dc.subject Underwater sound en
dc.title Caller sex and orientation influence spectral characteristics of “two-voice” stereotyped calls produced by free-ranging killer whales en
dc.type Article en
dc.identifier.doi 10.1121/1.2722056

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