Acoustic variability and individual distinctiveness in the vocal repertoire of red-capped mangabeys (Cercocebus torquatus).

Bouchet, Hélène; Blois‐Heulin, Catherine; Pellier, Anne-Sophie; Zuberbühler, Klaus; Lemasson, Alban

doi:10.1037/a0025018

Cited by 52 publications

(56 citation statements)

References 70 publications

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“…Because we used call segments, as the unit of analysis we could not measure the total call duration, the number of call segments in the call or the silent intervals between them, in contrast to some previous studies (e.g., [52]). We excluded measurements of frequency modulation because it was not a noticeable property in gorilla calls.…”

Section: Methodsmentioning

confidence: 99%

“…Support for this hypothesis has been found in primate species that are more spatially cohesive. For instance, among red-capped mangabeys' and female Campbell's monkeys' vocalizations, although all calls are individually distinct, those emitted during social/affiliative interactions showed higher acoustic variation and were more individually distinct than either long or alarm calls [52], [53].…”

Section: Introductionmentioning

confidence: 99%

“…Third, what acoustic characteristics are responsible for generating distinctive voice cues, and are those characteristics the same across call types? Although systematic study of individual distinctiveness and acoustic variability across the species' complete vocal repertoire is needed to understand the adaptive functions they play in the animal's communication systems, few attempts have been made thus far (skuas: [51]; primates: [12], [52], [53]). Instead, the majority of studies have focused on the analysis of only one vocalization at a time (e.g., [14], [15], [54]) or at maximum two (e.g., chimpanzees: [55], [56]; baboons: [50], [57]; putty-nosed monkeys: [58]).…”

Section: Introductionmentioning

confidence: 99%

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Individual Distinctiveness in Call Types of Wild Western Female Gorillas

2014

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Individually distinct vocalizations play an important role in animal communication, allowing call recipients to respond differentially based on caller identity. However, which of the many calls in a species' repertoire should have more acoustic variability and be more recognizable is less apparent. One proposed hypothesis is that calls used over long distances should be more distinct because visual cues are not available to identify the caller. An alternative hypothesis proposes that close calls should be more recognizable because of their importance in social interactions. To examine which hypothesis garners more support, the acoustic variation and individual distinctiveness of eight call types of six wild western gorilla (Gorilla gorilla) females were investigated. Acoustic recordings of gorilla calls were collected at the Mondika Research Center (Republic of Congo). Acoustic variability was high in all gorilla calls. Similar high inter-individual variation and potential for identity coding (PIC) was found for all call types. Discriminant function analyses confirmed that all call types were individually distinct (although for call types with lowest sample size - hum, grumble and scream - this result cannot be generalized), suggesting that neither the distance at which communication occurs nor the call social function alone can explain the evolution of identity signaling in western gorilla communication.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Individual Distinctiveness in Call Types of Wild Western Female Gorillas

2014

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“…In order to compare the individuality levels between the two segments we selected features that could be measured in both tonal (energy concentrated in narrow frequency bands) and wide-spectrum (energy distributed over a broad frequency range) vocalisations, and that were successfully used in previous studies on individual distinctiveness across call types (Bouchet et al, 2012;Warrington et al, 2014). We measured eight acoustic variables common to the bark and howl segments and two additional parameters for the howl segment (Table 1).…”

Section: Acoustic Measurementsmentioning

confidence: 99%

The bark, the howl and the bark-howl: Identity cues in dingoes’ multicomponent calls

Déaux¹,

Charrier²,

Clarke³

2016

Behavioural Processes

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“…Similarly, the level of individuality differs among call types in red-capped mangabeys (Cerocebus torquatus), with calls used to mediate social interactions (e.g. contact and threat) showing elevated levels of individuality [Bouchet et al, 2012].…”

Section: Identity Signals Facilitate Recognitionmentioning

confidence: 99%

Social Knowledge and Signals in Primates

Bergman

Sheehan

2012

American J Primatol

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Primates are notable for having a rich and detailed understanding of their social environment and there has been great interest in the evolution and function of social knowledge in primates. Indeed, primates have been shown to have impressive understandings of not only other group members but also the complex relationships among them. To be useful, however, social knowledge requires memories from previous encounters and observations about individual traits that are stable. Here, we argue that social systems or traits that make social knowledge more costly or less accurate will favor signals that either supplement or replace social knowledge. Thus, the relationship between signals and social knowledge can be complementary or antagonistic depending on the type of signal. Our goal in this review is to elucidate the relationships between signals and social knowledge in primates. We categorize signals into three types, each with different relationships to social knowledge. (1) Identity signals directly facilitate social knowledge, (2) current-state signals supplement information gained through social knowledge, and (3) badges of status replace social knowledge. Primates rely extensively on identity information, but it remains to be determined to what extent this is based on receiver perception of individual variation or senders using identity signals. Primates frequently utilize current-state signals including signals of intent to augment their interactions with familiar individuals. Badges of status are rare in primates, and the cases where they are used point to a functional and evolutionary trade-off between badges of status and social knowledge. However, the nature of this relationship needs further exploration.

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Acoustic variability and individual distinctiveness in the vocal repertoire of red-capped mangabeys (Cercocebus torquatus).

Cited by 52 publications

References 70 publications

Individual Distinctiveness in Call Types of Wild Western Female Gorillas

Individual Distinctiveness in Call Types of Wild Western Female Gorillas

The bark, the howl and the bark-howl: Identity cues in dingoes’ multicomponent calls

Social Knowledge and Signals in Primates

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