Whistles of Bottlenose Dolphins: Group Repertoires and Geographic Variations in Brazilian Waters

Hoffmann, Lilian Sander; Ferlin, Elton Luiz; Fruet, Pedro F.; Genoves, Rodrigo Cézar; Valdez, Fernanda Pedone; Tullio, Juliana Di; Caon, Glauco da Silva; Freitas, Thales Renato Ochotorena de

doi:10.1007/978-1-4419-7311-5_31

Cited by 9 publications

(11 citation statements)

References 3 publications

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“…Therefore, even if the gene flow among distant areas of the Mediterranean Sea is still mediated by individuals of the pelagic ecotype (Gaspari et al, ; Natoli, Birkun, Aguilar, Lopez, & Rus Hoelzel, ), the absence of a constant contact between the Croatia and Sardinia populations (located 2000 km apart) can be assumed. Consequently, the geographical variability of some characteristics of their whistle can be inferred (Hoffmann et al, ). However, where acoustic communication is mediated by learning processes (as in cetaceans), and therefore by cultural transmission (Bain, ; Ford, ; Janik & Slater, ), populations that are geographically but not genetically distant may also manifest acoustic variability (Camargo, Rollo, Giampaoli, & Bellini, ; Rendell & Whitehead, ; Rossi‐Santos & Podos, ).…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, Gaspari et al (2015) have found that the genetic structure (Hoffmann et al, 2012). However, where acoustic communication is mediated by learning processes (as in cetaceans), and therefore by cultural transmission (Bain, 1986;Ford, 1991;Janik & Slater, 2000), populations that are geographically but not genetically distant may also manifest acoustic variability (Camargo, Rollo, Giampaoli, & Bellini, 2007;Rendell & Whitehead, 2005;Rossi-Santos & Podos, 2006).…”

Section: Geographic Variabilitymentioning

confidence: 99%

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Whistle variation in Mediterranean common bottlenose dolphin: The role of geographical, anthropogenic, social, and behavioral factors

Manna¹,

Rako‐Gospić²,

Sarà

et al. 2020

Ecology and Evolution

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The studies on the variation of acoustic communication in different species have provided insight that genetics, geographic isolation, and adaptation to ecological and social conditions play important roles in the variability of acoustic signals. The dolphin whistles are communication signals that can vary significantly among and within populations. Although it is known that they are influenced by different environmental and social variables, the factors influencing the variation between populations have received scant attention. In the present study, we investigated the factors associated with the acoustic variability in the whistles of common bottlenose dolphin (Tursiops truncatus), inhabiting two Mediterranean areas (Sardinia and Croatia). We explored which factors, among (a) geographical isolation of populations, (b) different environments in terms of noise and boat presence, and (c) social factors (including group size, behavior, and presence of calves), were associated with whistle characteristics. We first applied a principal component analysis to reduce the number of collinear whistle frequency and temporal characteristics and then generalized linear mixed models on the first two principal components. The study revealed that both geographic distance/isolation and local environment are associated with whistle variations between localities. The prominent differences in the acoustic environments between the two areas, which contributed to the acoustic variability in the first principal component (PC1), were found. The calf's presence and foraging and social behavior were also found to be associated with dolphin whistle variation. The second principal component (PC2) was associated only with locality and group size, showing that longer and more complex tonal sound may facilitate individual recognition and cohesion in social groups. Thus, both social and behavioral context influenced significantly the structure of whistles, and they should be considered when investigating acoustic variability among distant dolphin populations to avoid confounding factors.

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Section: Discussionmentioning

confidence: 99%

Section: Geographic Variabilitymentioning

confidence: 99%

Whistle variation in Mediterranean common bottlenose dolphin: The role of geographical, anthropogenic, social, and behavioral factors

Manna¹,

Rako‐Gospić²,

Sarà

et al. 2020

Ecology and Evolution

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“…Physical characteristics are those related to morphological differences including age, sex, body size and vocal tract morphology (goats: [32]; hyenas: [9], [33]; deer: [7]; primates: [34]–[37]), whereas social characteristics are those reflecting specific social categories including rank, kinship, and even group membership (birds: [38], [39]; seals: [40]; dolphins: [41], [42]; bats: [5], [43]; primates: [44]–[47]). …”

Section: Introductionmentioning

confidence: 99%

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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“…Whistle frequency and duration ranged between 1.4 and 17.1kHz and from 41 to 1935ms (x = 400ms), respectively. Hoffmann et al (2012) also described the geographic variability of bottlenose dolphin whistle repertoires between the Tramandaí estuary and the SPSPA. For all whistle parameters, except for the final frequency, whistles between the two groups were statistically different.…”

Section: Genotypic Datamentioning

confidence: 99%

Report of the Working Group on Taxonomy and Stock Identity of bottlenose dolphins in the Southwest Atlantic Ocean

Ott

Barreto

Siciliano

et al. 2017

Lat. Am. J. Aquat. Mamm.

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Whistles of Bottlenose Dolphins: Group Repertoires and Geographic Variations in Brazilian Waters

Cited by 9 publications

References 3 publications

Whistle variation in Mediterranean common bottlenose dolphin: The role of geographical, anthropogenic, social, and behavioral factors

Whistle variation in Mediterranean common bottlenose dolphin: The role of geographical, anthropogenic, social, and behavioral factors

Individual Distinctiveness in Call Types of Wild Western Female Gorillas

Report of the Working Group on Taxonomy and Stock Identity of bottlenose dolphins in the Southwest Atlantic Ocean

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