Variation in Guiana dolphin (Sotalia guianensis) whistles: using a broadband recording system to analyze acoustic parameters in three areas of southeastern Brazil

Andrade, Luciana Guimarães de; Lima, Isabela Maria Seabra de; Macedo, Halerson da Silva; Carvalho, Rafael R.; Lailson‐Brito, José; Flach, Leonardo; Azevedo, Alexandre de Freitas

doi:10.1007/s10211-014-0183-7

Cited by 21 publications

(11 citation statements)

References 34 publications

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“…Differences may be influenced by divergences in ecological characteristics such as adaptations to different environments. Whistles of Guiana dolphins may be adapted to conditions in specific coastal environments (Andrade et al, 2015a) due to high degree of residence in costal environments throughout their distribution , while whistles of the other species may be adapted to a variety of environments, including coastal and oceanic regions. The relatively small sample size and the fact that only one of the species was recorded in different sites may have reduced the explanatory power of the analysis presented in this study.…”

Section: Discussionmentioning

confidence: 99%

“…To avoid oversampling groups/individuals, the number of whistles analyzed for each group was up to twice the number of individuals in the group for every species to minimize oversampling. The following acoustic parameters Andrade et al, 2015a) were measured: starting frequency (SF), ending frequency (EF), minimum frequency (MinF), maximum frequency (MaxF), delta frequency [MaxF -MinF] (DF), frequency at 1/4 of duration (F1/4), frequency at 1/2 of duration (F1/2), frequency at 3/4 of duration (F3/4), mean frequency (MF), duration (DUR), and number of inflection points (INF). All of the frequency variables were measured in kHz and the durations were measured in milliseconds.…”

Section: Acousticmentioning

confidence: 99%

“…This was done because a previous comparison among the repertoire of these populations and among other populations of this species recorded in adjacent sites in the Brazilian coast showed a high value of Wilks' Lambda for discriminant function analysis (DFA; Andrade et al, 2015a) and a low correct classification score . Statistica 7.1 (Stasoft, Inc., Tulsa, OK) was used for statistical analyses.…”

Section: Acousticmentioning

confidence: 99%

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Whistle comparison of four delphinid species in Southeastern Brazil

Lima

Andrade

Bittencourt

et al. 2016

The Journal of the Acoustical Society of America

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The present study evaluates variations in frequency and duration parameters of whistles of four dolphin species (Sotalia guianensis, Steno bredanensis, Stenella frontalis, and Tursiops truncatus), recorded in the Rio de Janeiro State Coast, Southeastern Brazil. A total of 487 whistles were analyzed. Acoustic parameters of the whistles were classified to species by discriminant function analysis. Overall classification score was 72.5%, with the highest classification score obtained for whistles of S. bredanensis and the lowest obtained for S. frontalis. Most differences were among S. bredanensis and S. guianensis, species that did not have their repertoires compared in other studies.

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Section: Discussionmentioning

confidence: 99%

Section: Acousticmentioning

confidence: 99%

Section: Acousticmentioning

confidence: 99%

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Whistle comparison of four delphinid species in Southeastern Brazil

Lima

Andrade

Bittencourt

et al. 2016

The Journal of the Acoustical Society of America

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“…However, other data from a previous study conducted by the same group (Andrade et al . ) and at the same location (Guanabara Bay) were suitable for comparison in the current study. Thus, acoustic data representing 7 yr of wild Guiana dolphin studies from 11 different localities (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Conversely, Deconto and Monteiro‐Filho (), Andrade et al . () and Leão et al . () present evidence for the occurrence of vocal plasticity in Guiana dolphins, suggesting that latitudinal variation in whistles is more indicative of local adaptation to the environment.…”

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confidence: 87%

Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?

Moron

Lopes

Reis

et al. 2018

Marine Mammal Science

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A previous comparison of whistles using data sampled at 48 kHz suggested that certain frequency parameters vary along a latitudinal gradient. This geographical pattern may be biased because whistles sampled at higher frequencies could potentially have very different frequency contents. The current study compared the acoustic parameters of Guiana dolphin (Sotalia guianensis) whistles recorded at a higher sampling rate (96 kHz) and from groups occupying two never before sampled sites, Benevente Bay, Espírito Santo, Brazil, and Formosa Bay, Rio Grande do Norte, Brazil, with recordings of other populations in South America. By only considering data sampled at a rate of at least 96 kHz, we aimed to detect differences in whistles across locations. Contrary to previous findings, our analyses do not indicate any clear separation between northern and southern populations based on whistles, and do not corroborate the hypothesis of latitudinal acoustic variation in this species. The variation in Guiana dolphin whistle parameters found here appears to be influenced by latitude to some extent, but several other factors, including sampling method, environmental fluctuations, and social influence on vocal learning, may be confounding the detection of a geographic pattern in these whistle samples.

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