[MARMAM] New publication: Whistle Stability and Variation in Captive Bottlenose Dolphins (Tursiops truncatus) Recorded in Isolation and Social Contexts

Patrícia Rachinas Lopes plopes at ispa.pt
Fri Jan 13 07:04:50 PST 2017

Dear all,

My co-authors and I are pleased to announce the publication of the
following article:

Rachinas-Lopes, P., Luís, A. R., Borges, A. S., Neto, M. & dos Santos, M.
E. (2017). Whistle Stability and Variation in Captive Bottlenose Dolphins (
*Tursiops* *truncatus) *Recorded in Isolation and Social Contexts. *Aquatic
Mammals* 43(1): 1-13. doi:10.1578/AM.43.1.2017.1

Common bottlenose dolphins (*Tursiops truncatus) *produce a range of
underwater vocalizations, both pulsed (echolocation clicks and
burst-pulses) and nonpulsed (whistles). Whistles may be emit- ted in
stereotyped (signature) or variant patterns, and their production might be
affected by sex, age, environmental, and social contexts. This study
examined, non-intrusively, the whistle emissions of six captive bottlenose
dolphins at Zoomarine in Algarve, Portugal, in two separate time sets and
three different contexts: two of the animals in isolation in 2008, and all
six in 2012, both segregated from their group and in social context. From a
total of 1,681 whistles, 1,249 were analyzed from 32 samples in different
contexts: seven samples in isolation in 2008, 18 in segregation in 2012,
and seven in social context. Through visual inspection of spectrograms,
whistles were classified into 12 different contour categories. Only one
category was found in both time sets and could be considered a signature
whistle by SIGID criteria (Janik et al., 2013). This contour was associated
with the same animal in 2008 and 2012. Whistle emission rates were 7.8
times higher in isolation as compared with social context, and significant
differences were also found in the end and maxi- mum frequencies as well as
number of inflections and loops. Multiloop whistles were more common in
isolation than in social contexts. The variant (nonstereotyped) contours
dominated the whistle production in segregated contexts (but not by
isolated animals) as well as in social contexts. This study highlights the
importance of examining the nonstereotyped portion of the bottlenose
dolphin’s whistle repertoire in different contexts as signature whistle
production may not be a constant or universal phenomenon.

You can access the article here:

Or send any requests directly to plopes at ispa.pt

Best regards,

Patrícia Rachinas-Lopes

*~~~~~~~~~~~~~~~~~~~~~~~~~ *
*Ph.D. Student*

MARE - Marine and Environmental Sciences Centre

ISPA - Instituto Universitário
Rua Jardim do Tabaco, 34
1149-041 Lisboa
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