Whistle variability in South Atlantic spinner dolphins from the Fernando de Noronha Archipelago off Brazil

Camargo, Fernanda Scarano; Rollo, Mario M.; Giampaoli, Viviana; Bellini, Cláudio

doi:10.1121/1.2359704

Cited by 24 publications

(11 citation statements)

References 27 publications

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“…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). Regardless of the mechanism responsible for such variability whether geographic distance and isolation, genetic variability, and/ or cultural drift (Wilkins et al, 2012), our results provide evidence for variability in whistles between the two populations.…”

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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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: 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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“…There are no published sound recordings from Australia. Their sounds have instead been document from Hawaii [230,[256][257][258][259][260][261][262], the Eastern Tropical Pacific [151,152], the northwestern Atlantic [174], Brazil [263][264][265] and the western Indian Ocean off Madagascar [266].…”

Section: Stenella Longirostris-long-snouted Spinner Dolphinmentioning

confidence: 99%

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

et al. 2017

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The study of marine soundscapes is a growing field of research. Recording hardware is becoming more accessible; there are a number of off-the-shelf autonomous recorders that can be deployed for months at a time; software analysis tools exist as shareware; raw or preprocessed recordings are freely and publicly available. However, what is missing are catalogues of commonly recorded sounds. Sounds related to geophysical events (e.g. earthquakes) and weather (e.g. wind and precipitation), to human activities (e.g. ships) and to marine animals (e.g. crustaceans, fish and marine mammals) commonly occur. Marine mammals are distributed throughout Australia's oceans and significantly contribute to the underwater soundscape. However, due to a lack of concurrent visual and passive acoustic observations, it is often not known which species produces which sounds. To aid in the analysis of Australian and Antarctic marine soundscape recordings, a literature review of the sounds made by marine mammals was undertaken. Frequency, duration and source level measurements are summarised and tabulated. In addition to the literature review, new marine mammal data are presented and include recordings from Australia of Omura's whales (Balaenoptera omurai), dwarf sperm whales (Kogia sima), common dolphins (Delphinus delphis), short-finned pilot whales (Globicephala macrorhynchus), long-finned pilot whales (G. melas), Fraser's dolphins (Lagenodelphis hosei), false killer whales (Pseudorca crassidens), striped dolphins (Stenella coeruleoalba) and spinner dolphins (S. longirostris), as well as the whistles and burst-pulse sounds of Australian pygmy killer whales (Feresa attenuata). To date, this is the most comprehensive acoustic summary for marine mammal species in Australian waters.

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“…Intra-specific variation in this type of vocalization has been assessed both at macro-(differences that occur over long distances and between populations that are geographically separated (KREBS & KROODSMA 1980)) and micro-geographic scales (variation between contiguous groups; KREBS & KROODSMA 1980), especially for Tursiops spp. (WANG et al 1995;JONES & SAYIGH 2002;CAMPBELL 2004;MORISAKA et al 2005aMORISAKA et al , 2005bBARON et al 2008;MAY-COLLADO & WARTZOK 2008;HAWKINS 2010;MAY-COLLADO 2010), Stenella frontalis (BARON et al 2008), Pseudorca crassidens, Grampus griseus, Globicephala macrorhynchus and Globicephala melas (RENDELL et al 1999), Sotalia guianensis (AZEVEDO & VAN SLUYS 2005;ROSSI-SANTOS & PODOS 2006), Stenella longirostris (BAZÚA- DURÁN & AU 2004;CAMARGO et al 2006) and Stenella coeruleoalba PAPALE et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Macro- and micro-geographic variation of short-beaked common dolphin’s whistles in the Mediterranean Sea and Atlantic Ocean

Papale

Azzolin

Cascão

et al. 2013

Ethology Ecology & Evolution

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Genetic studies have shown that there are small but significant differences between the short-beaked common dolphin populations in the Atlantic Ocean and those in the Mediterranean Sea. The short-beaked common dolphin is a highly vocal species with a wide sound production repertoire including whistles. Whistles are continuous, narrowband, frequency-modulated signals that can show geographic variation in dolphin species. This study tests whether the differences, highlighted by genetic studies, are recognisable in the acoustic features of short-beaked common dolphin's whistles in the two adjacent areas of the Atlantic Ocean and the Mediterranean Sea. From a selected sample of good quality whistles (514 recorded in the Atlantic and 193 in the Mediterranean) 10 parameters of duration, frequency and frequency modulation were measured. Comparing data among basins, differences were found for duration and all frequency parameters except for minimum frequency. Modulation parameters showed the highest coefficient of variation. Through discriminant analysis we correctly assigned 75.7% of sounds to their basins. Furthermore, micro-geographic analysis revealed similarity between the sounds recorded around the Azores and the Canary archipelagos and between the Bay of Biscay and the Mediterranean Sea. Results are in agreement with the hypothesis proposed by previous genetic studies that two distinct populations are present, still

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Whistle variability in South Atlantic spinner dolphins from the Fernando de Noronha Archipelago off Brazil

Cited by 24 publications

References 27 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

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

Macro- and micro-geographic variation of short-beaked common dolphin’s whistles in the Mediterranean Sea and Atlantic Ocean

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