Signature whistles in free-ranging populations of Indo-Pacific bottlenose dolphins, Tursiops aduncus

Show simple item record Gridley, Tess Cockcroft, Victor G. Hawkins, Elizabeth R. Blewitt, Michelle Lemon Morisaka, Tadamichi Janik, Vincent M. 2014-07-08T08:09:40Z 2014-04
dc.description.abstract Common bottlenose dolphins (Tursiops truncatus) use individually distinctive signature whistles which are highly stereotyped and function as contact calls. Here we investigate whether Indo-Pacific bottlenose dolphins (T. aduncus) use signature whistles. The frequency trace of whistle contours recorded from three genetically distinct free-ranging populations was extracted and sorted into whistle types of similar shape using automated categorization. A signature whistle identification method based on the temporal patterns in signature whistle sequences of T. truncatus was used to identify signature whistle types (SWTs). We then compared the degree of variability in SWTs for several whistle parameters to determine which parameters are likely to encode identity information. Additional recordings from two temporarily isolated T. aduncus made during natural entrapment events in 2008 and 2009 were analyzed for the occurrence of SWTs. All populations were found to produce SWTs; 34 SWTs were identified from recordings of free-ranging T. aduncus and oneSWT was prevalent in each recording of the two temporarily isolated individuals. Of the parameters considered, mean frequency and maximumfrequency were the least variable and therefore most likely to reflect identity information encoded in frequency modulation patterns. Our results suggest that signature whistles are commonly used by T. aduncus. en_US
dc.description.embargo 2015-04-30
dc.description.librarian hb2014 en_US
dc.description.sponsorship This research was supported by a NERC studentship and a University of St Andrews Russell Trust Award to TG, a Royal Society University Research Fellowship and a Fellowship of the Wissenschaftskolleg zu Berlin to VMJ. Funding for MLB was through an Australian Postgraduate Award, Graduate School of the Environment, Macquarie University, NSW, the Jervis Bay Marine Parks Authority and Dolphin Watch Cruises, Jervis Bay. en_US
dc.description.uri en_US
dc.identifier.citation Gridley, T, Cockcroft, VG, Hawkins, ER, Blewitt, ML, Morisaka, T & Janik, VM 2014, 'Signature whistles in free-ranging populations of Indo-Pacific bottlenose dolphins, Tursiops aduncus', Marine Mammal Science, vol. 30, no. 2, pp. 512-527. en_US
dc.identifier.issn 0824-0469 (print)
dc.identifier.issn 1748-7692 (online)
dc.identifier.other 10.1111/mms.12054
dc.language.iso en en_US
dc.publisher Wiley-Blackwell en_US
dc.rights © 2013 Society for Marine Mammalogy. The definite version is available at en_US
dc.subject Indo-Pacific bottlenose dolphin en_US
dc.subject Tursiops aduncus en_US
dc.subject Categorization en_US
dc.subject Identity en_US
dc.subject Signature whistle en_US
dc.title Signature whistles in free-ranging populations of Indo-Pacific bottlenose dolphins, Tursiops aduncus en_US
dc.type Postprint Article en_US

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