Andrade Luciana Guimarães de, Bisi Tatiana Lemos, Lailson-Brito José, Azevedo Alexandre de Freitas
Programa de Pós-Graduação em Ecologia e Evolução, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, PHLC, 2° andar, sala 224, Maracanã, Rio de Janeiro 20550-013, Rio de Janeiro, Brazil.
Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro 20550-013, Rio de Janeiro, Brazil.
J Acoust Soc Am. 2017 Apr;141(4):2947. doi: 10.1121/1.4981768.
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.
对圭亚那海豚的声学研究主要集中在哨叫声上，而对该物种的脉冲信号了解甚少。本研究描述了圭亚那海豚猝发脉冲的时间和频谱特性。2013年和2014年，在巴西东南部瓜纳巴拉湾的浅水区对2至23只圭亚那海豚组成的群体在进食和社交时进行了记录。猝发脉冲分析包括两个步骤：信号检测和声学参数分析。对总共197个猝发脉冲分析了八个变量：咔哒声数量、猝发脉冲持续时间、咔哒声间隔、咔哒声持续时间、峰值频率、中心频率、-3 dB带宽和-10 dB带宽。平均猝发脉冲持续时间为108.6毫秒[标准差（SD）= 91.3]，平均有168次咔哒声（SD = 137.3）。猝发脉冲的咔哒声间隔很短（0.7毫秒，SD = 0.3），平均咔哒声持续时间为300微秒（SD = 100）。平均峰值频率和中心频率分别为28千赫（SD = 11.6）和29千赫（SD = 11.0）。平均-3 dB带宽为15千赫（SD = 7.5），平均-10 dB带宽为40.5千赫（SD = 14.3）。圭亚那海豚猝发脉冲的定量表征是描述该物种完整声学特征的重要一步。
