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, 279 (1738), 2539-45

Bottlenose Dolphins Exchange Signature Whistles When Meeting at Sea

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Bottlenose Dolphins Exchange Signature Whistles When Meeting at Sea

Nicola J Quick et al. Proc Biol Sci.

Abstract

The bottlenose dolphin, Tursiops truncatus, is one of very few animals that, through vocal learning, can invent novel acoustic signals and copy whistles of conspecifics. Furthermore, receivers can extract identity information from the invented part of whistles. In captivity, dolphins use such signature whistles while separated from the rest of their group. However, little is known about how they use them at sea. If signature whistles are the main vehicle to transmit identity information, then dolphins should exchange these whistles in contexts where groups or individuals join. We used passive acoustic localization during focal boat follows to observe signature whistle use in the wild. We found that stereotypic whistle exchanges occurred primarily when groups of dolphins met and joined at sea. A sequence analysis verified that most of the whistles used during joins were signature whistles. Whistle matching or copying was not observed in any of the joins. The data show that signature whistle exchanges are a significant part of a greeting sequence that allows dolphins to identify conspecifics when encountering them in the wild.

Figures

Figure 1.
Figure 1.
Spectrograms of three separate exchange events including localization plots for the third event. Spectrograms showing examples of three stereotyped and repeated whistle sequences. Letters and bars above spectrograms indicate the two whistle types within the exchange event. Localization plots show position to where whistle types O and P in spectrogram 3 are localized. Blue circles in plots indicate positions of hydrophone receivers around boat. All examples of whistle type O within the event localized to a position of 7 o'clock from the boat. All examples of whistle type P localized to a position at 5 o'clock from the boat.
Figure 2.
Figure 2.
Occurrence of joins and exchange events. Plot of the total number of observations of whistle exchanges and joins and how their occurrences related to each other.

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