Interspecific differences in whistles produced by inshore dolphins in Moreton Bay, Queensland, Australia

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Abstract
The sounds produced by bottlenose dolphins, Tursiops truncatus, and Indo-Pacific humpback dolphins, Sousa chinensis, were recorded on 11 days from 3 April to 13 August 1990 in Moreton Bay, eastern Australia. Twelve hours and 34 minutes of sound were recorded. The physical structure of whistles was described using a variable for duration and seven variables for frequency. Data were subjected to principal components analysis (PCA) and canonical discriminant analysis (CDA). PCA demonstrated the range of whistle contours recorded. CDA demonstrated differences in the whistles between species. Humpback dolphin whistles differed in shape (frequency modulation) and were generally of shorter duration and higher overall frequency than those of bottlenose dolphin whistles.

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