Analysis of whistles produced by the Tucuxi Dolphin Sotalia fluviatilis from Sepetiba Bay, Brazil

Anais da Academia Brasileira de Ciências

Claudia Erber¹  Sheila M. Simão¹ 

[1] ,UFRRJ Instituto de Florestas Departamento de Ciências AmbientaisSeropédica RJ ,Brasil

关键词: Sotalia fluviatilis;    Cetacea;    Delphinidea;    vocal repertoire;    whistles;    behavior;    Sotalia fluviatilis;    Cetacea;    Delphinidea;    repertório vocal;    assobios;    comportamento;   

DOI  :  10.1590/S0001-37652004000200029

来源: SciELO

【 摘 要 】

From July 2001 to June 2002, we recorded a total of 2h55min of Tucuxi Dolphin Sotalia fluviatilis vocalizations from Sepetiba Bay, Brazil (22º35'S-44º03'W). A total of 3350 whistles were analyzed quantitative and qualitatively and were divided into 124 types, by visual inspection of sonograms. The following parameters were measured: Initial Frequency, Final Frequency, Minimum Frequency, Maximum Frequency, Duration, Number of Inflections, Frequency at the Inflection Points, Frequency at 1/2, 1/4, and 3/4 of whistle duration, Presence of Frequency Modulation and Harmonics. Ascending type whistles (N=2719) were most common, representing 82% of the total. Dolphin behavior and average group size observed during recording influenced the whistle's quantitative and qualitative parameters. The results demonstrate the great diversity of whistles emitted and indicate a functional role of these vocalizations during the observed behaviors.

【 授权许可】

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