Whistles of tucuxi dolphins (Sotalia fluviatilis) in Brazil:: Comparisons among populations
Whistles of tucuxi dolphins (Sotalia fluviatilis) in Brazil:: Comparisons among populations
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DOI：
10.1121/1.1859232
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发表时间：
2005-03-01
影响因子：
2.4
通讯作者：
Van Sluys, M
中科院分区：
文献类型：
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作者：
Azevedo, AF;Van Sluys, M
对巴西水域八个区域的图库西海豚（Sotalia Fluviatilis）的声哨参数进行了定量和比较分析。图库西主要产生上扫哨声，尽管其特征与其他飞燕草相似，但哨声较短且形状不那么复杂。一些信号的基频分量高于 24 kHz，更宽的频带系统可能有助于进一步研究 tucuxi 口哨。口哨的频率参数的变异系数最低，而持续时间和音调变化次数的变异系数最高。大约 65% 的口哨在研究地点之间具有共同特征，但 SF、MinF、MeF、F1/4、F1/2 和 F3/4 从南部人群到北部人群的频率增加。相邻站点区域之间的哨声特征变化幅度比非相邻站点区域之间的要小。然而，在一些成对比较中，非相邻区域之间的哨声比相邻区域之间的哨声更加相似，这表明除了遗传和混合之外，其他因素也影响了土库西哨声的特征。相邻地区之间只有少数数量的口哨变量存在显着差异，并且口哨参数范围存在重叠，这使得区分相邻土库西群体之间的口哨变得困难。 (c) 2005 年美国声学学会。
A quantitative and comparative analysis of the acoustic whistles parameters of tucuxi dolphins (Sotalia fluviatilis) from eight areas in Brazilian waters were conducted. Tucuxi produced mainly upsweep whistles, and despite their similar characteristics to other delphinids, whistles were shorter and less complex in shape. Some signals had fundamental frequency components above 24 kHz, and a broader band system may be useful in further studies concerning tucuxi whistles. The frequency parameters of the whistles had the lowest variation coefficients, whereas the duration and number of inflections had the highest variation coefficients. About 65% of all whistles had common characteristics between study localities, but SF, MinF, MeF, F1/4, F1/2, and F3/4 increased in frequency from southern to northern populations. The magnitude of the whistle characteristics variation was comparatively smaller between adjacent sites areas than between nonadjacent ones. However, for some pairwise comparisons the whistles were more similar between nonadjacent areas than between adjacent ones, indicating that other factors besides genetic and mixing affected tucuxi whistle characteristics. Only a few numbers of whistle variables were significantly different between adjacent areas and the parameter ranges of whistles overlapped, which made it difficult to discriminate whistles between adjacent tucuxi populations. (c) 2005 Acoustical Society of America.