Dear colleagues,
On behalf of my co-authors, I
am pleased to announce our recent article on burst pulses of Guiana dolphin published
in The Journal of the Acoustical Society of America:
Andrade, L. G., Bisi, T. L., Lailson-Brito, J. and
Azevedo, F. A. (2017). Burst pulses of Guiana dolphin (Sotalia guianensis) in southeastern Brazil. The Journal of the
Acoustical Society of America, 141(4) 2947-2956. http://dx.doi.org/10.1121/1.4981768
ABSTRACT
Acoustic studies of Guiana
dolphin have been focused on whistles, with little known about pulse signals in this species. This study characterized the
temporal and spectral
properties of
Guiana dolphin burst pulses. Groups of 2 to 23 Guiana dolphins were recorded
while feeding and socializing in shallow waters in Guanabara Bay, southeastern
Brazil, in 2013 and 2014. Burst pulse analysis involved two steps: signal detection and acoustic parameter analysis. Eight variables were analyzed for 197 total burst pulses: number of clicks,
burst pulse duration, interclick interval, click duration, peak frequency,
center frequency, −3 dB bandwidth, and −10 dB bandwidth. Mean burst pulse
duration was 108.6 ms [standard deviation (SD) = 91.3] with a mean of 168
clicks (SD = 137.3). Burst pulses had short interclick interval (0.7 ms,
SD = 0.3) and mean click duration of 300 μs (SD = 100). Mean peak frequency and center frequency
were 28 kHz (SD = 11.6) and 29 kHz (SD = 11.0), respectively. Mean −3 dB
bandwidth was 15 kHz (SD = 7.5) and mean −10 dB bandwidth was 40.5 kHz
(SD = 14.3). The quantitative characterization of Guiana dolphin burst pulses
is an important step in describing the full acoustic repertoire of this species.
Best wishes,
Luciana G. Andrade
--
Dra. Luciana Guimarães de Andrade
Doutorado em Ecologia e Evolução - PPGEE/UERJ