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Repertoire and classification of non-song calls in Southeast Alaskan humpback whales (Megaptera novaeangliae)

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Abstract
  • On low-latitude breeding grounds, humpback whales produce complex and highly stereotyped songs as well as a range of non-song sounds associated with breeding behaviors. While on their Southeast Alaskan foraging grounds, humpback whales produce a range of previously unclassified non-song vocalizations. This study investigates the vocal repertoire of Southeast Alaskan humpback whales from a sample of 299 non-song vocalizations collected over a 3-month period on foraging grounds in Frederick Sound, Southeast Alaska. Three classification systems were used, including aural spectrogram analysis, statistical cluster analysis, and discriminant function analysis, to describe and classify vocalizations. A hierarchical acoustic structure was identified; vocalizations were classified into 16 individual call types nested within four vocal classes. The combined classification method shows promise for identifying variability in call stereotypy between vocal groupings and is recommended for future classification of broad vocal repertoires.
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  • Fournet, M. E., Szabo, A., & Mellinger, D. K. (2015). Repertoire and classification of non-song calls in Southeast Alaskan humpback whales (Megaptera novaeangliae). Journal of the Acoustical Society of America, 137(1), 1-10. doi:10.1121/1.4904504
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  • 137
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  • 1
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  • This work was supported by the Alaska Whale Foundation, by the Hatfield Marine Science Center, by Office of Naval Research Grant N00014-11-IP20086 and Naval Postgraduate School Grant N00244-11-1-0026.
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