Cremer Marta Jussara, Holz Annelise Colin, Bordino Pablo, Wells Randall S, Simões-Lopes Paulo César
Projeto Toninhas, Universidade da Região de Joinville, UNIVILLE, P.O. Box 110, 89240-000, São Francisco do Sul, Santa Catarina, Brazil.
Fundación Aquamarina, Del Besugo 1525, (7167) Pinamar, Buenos Aires, Argentina.
J Acoust Soc Am. 2017 Mar;141(3):2047. doi: 10.1121/1.4978437.
Franciscana dolphin (Pontoporia blainvillei) whistles were documented for the first time during 2003-2013 in Babitonga Bay estuary, South Brazil, together with burst pulses. Recordings were made from small boats under good sea conditions, and recording equipment that allowed analysis of sounds up to 96 kHz. The recordings were made in the presence of 2-31 franciscana dolphins. During 23 h and 53 min, 90 whistles and 51 burst pulse series were recorded. Although Guiana dolphins (Sotalia guianensis) inhabit nearby waters, none were observed in the area during the recordings. The authors recorded ten types of whistles. The initial frequency varied between 1.6 and 94.6 kHz, and the final frequency varied between 0.7 and 94.5 kHz; the authors were not able to determine if dolphin whistles exceeded the 96 kHz recording limit of the authors' equipment, although that is likely, especially because some whistles showed harmonics. Whistle duration varied between 0.008 and 0.361 s. Burst pulses had initial frequencies between 69 and 82.1 kHz (77 ± 3.81). These results showed that P. blainvillei produces whistles and burst pulses, although they seem to be produced infrequently.
2003年至2013年期间，在巴西南里奥格兰德州的巴比通加湾河口首次记录到了弗氏海豚（Pontoporia blainvillei）的哨叫声，同时还记录到了猝发脉冲声。这些录音是在良好海况下从小船上进行的，录音设备能够分析高达96千赫的声音。录音时周围有2至31只弗氏海豚。在23小时53分钟内，共记录到90次哨叫声和51个猝发脉冲序列。尽管圭亚那海豚（Sotalia guianensis）栖息在附近海域，但在录音期间该区域未观察到它们的身影。作者记录到了十种类型的哨叫声。其初始频率在1.6至94.6千赫之间变化，最终频率在0.7至94.5千赫之间变化；尽管很有可能（尤其是因为一些哨叫声显示出谐波），但作者无法确定海豚的哨叫声是否超过了其设备96千赫的录音极限。哨叫声的持续时间在0.008至0.361秒之间变化。猝发脉冲的初始频率在69至82.1千赫之间（77±3.81）。这些结果表明弗氏海豚会发出哨叫声和猝发脉冲声，尽管它们似乎不常发出。
