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An acoustical study was conducted on captive killer whales (Orcinus orca) to determine if individuals or groups differed in their vocalizations. Twenty-one different underwater vocalization categories produced by 13 animals were recorded within a 40 Hz to 20 kHz bandwidth. Eight acoustical variables (starting and ending frequencies of the signal, duration, harmonic interval, starting and ending frequencies of the fundamentals, and low and high concentration of energy) were measured for each vocalization. multivariatediscriminant analysis was used to determine whether individual, oceanarium, or sexual differences were detectable in their vocalizations. Results showed distinct acoustical groupings by individuals, by oceanariums, and by sex.
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Dahlheim et al. (1982) studied this question.
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