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首页> 外文期刊>Canadian Journal of Zoology >Low-frequency sounds emitted by Sotalia fluviatilis guianensis (Cetacea :Delphinidae) in an estuarine region in southeastern Brazil
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Low-frequency sounds emitted by Sotalia fluviatilis guianensis (Cetacea :Delphinidae) in an estuarine region in southeastern Brazil

机译：巴西东南部河口地区的南美大羚羊（Cetacea：Delphinidae）发出的低频声音

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Recordings of the vocalizations of the dolphin Sotalia fluviatilis guianensis were made in an estuarine complex at Cananeia in southeastern Brazil over a period of 10 years (1989-1998). This area is characterized by mangroves and the constant presence of dolphins. Recordings were obtained at depths of 2-4 m using digital and analog recorders at a speed of 19 cm/s. Four classes of sounds were identified. "Whistles," which are used in social activities, occurred with the greatest frequency (chi (2) = 58.92, df = 3, P < 0.001). "Calls," which were very variable in form, were the second most common class used by family groups ((2) = 10.96, df = 2, 0.005 > P > 0.001). There were no differences in the rates at which schools emitted whistles and calls (chi (2) = 2.12, df = 1, 0.25 > P > 0.10). "Gargles" were apparently emitted by calves and were similar in structure to a low-frequency call. The fourth class, "clicks," are used in echolocation. Clicks varied considerably in their frequency of occurrence and frequency of emission, and were not always detected. Then were significant differences in emission rates among the four classes (chi (2) = 18.73, df = 3, P < 0.001). In addition, which class of sound was emitted depended on the type of activity exhibited by the dolphins (displacement, fishing, social) and on the social structure (family or school) adopted.
机译：在十年的时间里（1989-1998年），在巴西东南部的Cananeia的河口群中记录了海豚fluviatilis guianensis的发声。该地区的特点是红树林和海豚不断存在。使用数字和模拟记录器以19 cm / s的速度在2-4 m的深度处获得记录。确定了四类声音。在社交活动中使用的“口哨”发生频率最高（chi（2）= 58.92，df = 3，P <0.001）。形式上变化很大的“呼叫”是家庭组使用的第二常见的类别（χ（2）= 10.96，df = 2，0.005> P> 0.001）。学校发出口哨声和呼叫声的比率没有差异（chi（2）= 2.12，df = 1，0.25> P> 0.10）。 “恶臭”显然是由小牛发出的，其结构类似于低频鸣叫。在回声定位中使用第四类“点击”。点击的发生频率和发射频率变化很大，并非总是可以检测到。然后，这四个类别之间的排放率存在显着差异（chi（2）= 18.73，df = 3，P <0.001）。另外，发出哪种声音取决于海豚表现出的活动类型（位移，捕鱼，社交）和所采用的社交结构（家庭或学校）。

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