Whistle matching in wild bottlenose dolphins (Tursiops truncatus)
- V. Janik
- PhysicsScience
- 25 August 2000
This report shows that wild, unrestrained bottlenose dolphins use their learned whistles in matching interactions, in which an individual responds to a whistle of a conspecific by emitting the same whistle type.
Context-specific use suggests that bottlenose dolphin signature whistles are cohesion calls
Signature whistle copying was rare and did not initiate reunions or specific vocal responses, which strongly support the hypothesis that signature whistles are used to maintain group cohesion.
The different roles of social learning in vocal communication
It is found that unexpected genetic or environmental factors can have considerable effects on vocal behaviour in birds and mammals and are often more likely to cause changes or differences in vocalizations than investigators may assume.
Source levels and the estimated active space of bottlenose dolphin (Tursiops truncatus) whistles in the Moray Firth, Scotland
- V. Janik
- PhysicsJournal of Comparative Physiology
- 21 June 2000
The results suggest that whistles can be used to maintain group cohesion over large distances but also that dolphins that researchers consider to belong to separate groups might be in acoustic contact.
Food–related bray calls in wild bottlenose dolphins (Tursiops truncatus)
- V. Janik
- BiologyProceedings of the Royal Society of London…
- 7 May 2000
The low–frequency structure of the bottlenose dolphin bray suggests that it evolved because of a role in manipulating prey rather than in attracting conspecifics, suggesting that dolphins exploit the perceptual systems of their prey to facilitate capture.
Pitfalls in the categorization of behaviour: a comparison of dolphin whistle classification methods
- V. Janik
- Environmental ScienceAnimal Behaviour
- 31 January 1999
Five human observers, without knowledge of the recording context, were more likely than the computer methods to identify signature whistles that were used only while an animal was isolated from the rest of the group.
Identifying signature whistles from recordings of groups of unrestrained bottlenose dolphins (Tursiops truncatus)
A novel method is presented, SIGnature IDentification (SIGID), that can identify signature whistles in recordings of groups of dolphins recorded via a single hydrophone and will facilitate the study of signature whistle use in the wild, signature whistle diversity between different populations, and potentially allow signatures whistles to be used in mark-recapture studies.
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