Masking in three pinnipeds: underwater, low-frequency critical ratios.
Masking in three pinnipeds: underwater, low-frequency critical ratios.
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三种鳍足类动物的掩蔽：水下、低频临界比。
DOI：
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发表时间：
2000
影响因子：
2.4
通讯作者：
D. Kastak
中科院分区：
文献类型：
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作者：
Brandon L. Southall;R. Schusterman;D. Kastak
使用行为技术确定北象海豹 (Mirounga angustirostris)、斑海豹 (Phoca vitulina) 和加州海狮 (Zalophus californianus) 的水下掩蔽听力阈值。倍频程白噪声掩蔽器以 200 至 2500 Hz 范围内的五个测试频率为中心；使用稍宽的噪声带在 100 Hz 下进行测试。临界比率是在每个测试频率的一个掩蔽噪声水平下计算的。在 200 Hz 以上，临界比随频率增加而增加。这种模式与大多数测试动物中观察到的模式相似，表明这些鳍足类动物缺乏检测噪音中低频音调声音的特化。然而，这项研究中的个别鳍足类动物，特别是北象海豹，检测到的信号信噪比相对较低。这些结果提供了一种估计暴露于人为噪声源的鳍足类动物的听觉掩蔽区域的方法。
Behavioral techniques were used to determine underwater masked hearing thresholds for a northern elephant seal (Mirounga angustirostris), a harbor seal (Phoca vitulina), and a California sea lion (Zalophus californianus). Octave-band white noise maskers were centered at five test frequencies ranging from 200 to 2500 Hz; a slightly wider noise band was used for testing at 100 Hz. Critical ratios were calculated at one masking noise level for each test frequency. Above 200 Hz, critical ratios increased with frequency. This pattern is similar to that observed in most animals tested, and indicates that these pinnipeds lack specializations for detecting low-frequency tonal sounds in noise. However, the individual pinnipeds in this study, particularly the northern elephant seal, detected signals at relatively low signal-to-noise ratios. These results provide a means of estimating zones of auditory masking for pinnipeds exposed to anthropogenic noise sources.