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Roaring high and low: composition and possible functions of the Iberian stag's vocal repertoire

Passilongo, Daniela and Reby, David and Carranza, Juan and Apollonio, Marco (2013) Roaring high and low: composition and possible functions of the Iberian stag's vocal repertoire. PLoS One, Vol. 8 (5), e63841. eISSN 1932-6203. Article.

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DOI: 10.1371/journal.pone.0063841

Abstract

We provide a detailed description of the rutting vocalisations of free-ranging male Iberian deer (Cervus elaphus hispanicus, Hilzheimer 1909), a geographically isolated and morphologically differentiated subspecies of red deer Cervus elaphus. We combine spectrographic examinations, spectral analyses and automated classifications to identify different call types, and compare the composition of the vocal repertoire with that of other red deer subspecies. Iberian stags give bouts of roars (and more rarely, short series of barks) that are typically composed of two different types of calls. Long Common Roars are mostly given at the beginning or at the end of the bout, and are characterised by a high fundamental frequency (F0) resulting in poorly defined formant frequencies but a relatively high amplitude. In contrast, Short Common Roars are typically given in the middle or at the end of the bout, and are characterised by a lower F0 resulting in relatively well defined vocal tract resonances, but low amplitude. While we did not identify entirely Harsh Roars (as described in the Scottish red deer subspecies (Cervus elaphus scoticus), a small percentage of Long Common Roars contained segments of deterministic chaos. We suggest that the evolution of two clearly distinct types of Common Roars may reflect divergent selection pressures favouring either vocal efficiency in high pitched roars or the communication of body size in low-pitched, high spectral density roars highlighting vocal tract resonances. The clear divergence of the Iberian red deer vocal repertoire from those of other documented European red deer populations reinforces the status of this geographical variant as a distinct subspecies.

Item Type:Article
ID Code:9046
Status:Published
Refereed:Yes
Uncontrolled Keywords:Cervus elaphus hispanicus, vocal repertoire, spectrographic examinations
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Public Library of Science
eISSN:1932-6203
Copyright Holders:© 2013 Passilongo et al.
Deposited On:15 May 2013 09:46

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