Characteristics of Guiana dolphins ( Sotalia guianensis) burst-pulse sounds emitted during different surface activity rates in Rio de Janeiro’s coast

Publication Type:Journal Article
Year of Publication:2018
Authors:Barbosa, Bittencourt, Andrade, Bisi, Lailson-Brito, Azevedo
Journal:The Journal of the Acoustical Society of America
Volume:144
Issue:3
Pagination:1978 - 1978
Date Published:Jan-09-2018
ISSN:0001-4966
Abstrakt:

Burst-pulses are still the least studied signals in delphinid acoustic repertoire. In this study, acoustic data were gathered in two Rio de Janeiro coastal bays where groups of Guiana dolphins can be found regularly. The acoustic equipment consisted of a C54XRS hydrophone (-155.8 dBV, 0.006 Hz a 203 kHz) and a Fostex digital recorder (192 kHz sampling rate). During each recording, the surface activity rate of the group was classified as being high or low. Burst-pulses were analyzed using SoundRuler software. Fifty signals were randomly selected and the values for duration (low = 143.9 ± 145.4; high = 82.2 ± 74.8), interpulse interval (low = 2.81 ± 1.92; high = 1.34 ± 1.35), number of pulses (low = 52.6 ± 55.7; high = 71.6 ± 64.5), peak frequency (low = 37.4 ± 2.5; high = 38.5 ± 3.2), and minimum frequency (low = 15.4 ± 6.5; high = 6.7 ± 5.3) were measured. Additionally, a Mann-Whitney U test compared all acoustic parameters of burst-pulses emitted during both surface activity rates. Significant differences between activity rates were found for interpulse interval (p<0.01) and minimum frequency (p<0.01). This scenario could indicate that some burst-pulse parameters are related to group arousal and behavior.

URL:http://asa.scitation.org/doi/10.1121/1.5068636
DOI:10.1121/1.5068636
Short Title:The Journal of the Acoustical Society of America
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith