Characteristics of whistles from rough-toothed dolphins (Steno bredanensis) in Rio de Janeiro coast, southeastern Brazil

The Journal of the Acoustical Society of America
Isabela Maria Seabra de LimaAlexandre de Freitas Azevedo

Abstract

There is no information about the whistles of rough-toothed dolphins in the South Atlantic Ocean. This study characterizes the whistle structure of free-ranging rough-toothed dolphins recorded on the Rio de Janeiro coast, southeastern Brazil, and compares it to that of the same species in other regions. A total of 340 whistles were analyzed. Constant (N = 115; 33.8%) and ascending (N = 99; 29.1%) whistles were the most common contours. The whistles recorded had their fundamental frequencies between 2.24 and 13.94 kHz. Whistles without inflection points were frequently emitted (N = 255; 75%). Some signals presented breaks or steps in their contour (N = 97; 28.5%). Whistle duration was short (347 ± 236 ms and 89.7% of the whistles lasted <600 ms). Seventy-eight whistle contour types were found in the total of whistles analyzed, and 27 (7.9%) of these occurred only once. Most of the whistle types were unique to a particular recording session (N = 43). The signals emitted by the rough-toothed dolphins in southeastern Brazil were characterized by low frequency modulation, short duration, low number of inflection points, and breaks. Differences in the mean values of the whistle parameters were found between this and other studies tha...Continue Reading

References

Jan 2, 2003·The Journal of the Acoustical Society of America·Carmen Bazúa-Durán, Whitlow W L Au
Sep 30, 2003·The Journal of the Acoustical Society of America·Marc O LammersDenise L Herzing
Dec 14, 2004·Chemistry : a European Journal·Bernhard Kempf, Herbert Mayr
Jan 22, 2005·The Journal of the Acoustical Society of America·Carmen Bazúa-Durán, Whitlow W L Au
Apr 6, 2005·The Journal of the Acoustical Society of America·Alexandre F Azevedo, Monique Van Sluys
Jul 7, 2007·The Journal of the Acoustical Society of America·Julie N OswaldMarc O Lammers
Aug 19, 2007·BMC Evolutionary Biology·Laura J May-ColladoDouglas Wartzok
Apr 8, 2010·The Journal of the Acoustical Society of America·Alexandre F AzevedoJ Lailson-Brito
Apr 8, 2010·The Journal of the Acoustical Society of America·Elizabeth R Hawkins, Donald F Gartside

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Citations

Apr 6, 2013·The Journal of the Acoustical Society of America·Zhitao WangDing Wang
Oct 9, 2019·The Journal of the Acoustical Society of America·Francesco CarusoMassimiliano Rosso

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