Au W W, Carder D A, Penner R H, Scronce B L
J Acoust Soc Am. 1985 Feb;77(2):726-30. doi: 10.1121/1.392341.
The echolocation signals of the same beluga whale (Delphinapterus leucas) were measured first in San Diego Bay, and later in Kaneohe Bay, Oahu, Hawaii. The ambient noise level in Kaneohe Bay is typically 12-17 dB greater than in San Diego Bay. The whale demonstrated the adaptiveness of its biosonar by shifting to higher frequencies and intensities after it was moved to Kaneohe. In San Diego, the animal emitted echolocation signals with peak frequencies between 40 and 60 kHz, and bandwidths between 15 and 25 kHz. In Kaneohe, the whale shifted its signals approximately an octave higher in frequencies with peak frequencies between 100 and 120 kHz, and bandwidths between 20 and 40 kHz. Signal intensities measured in Kaneohe were up to 18 dB higher than in San Diego. The data collected represent the first quantitative evidence of the adaptive capability of a cetacean biosonar system.
首先在圣地亚哥湾测量了同一头白鲸（白鲸属）的回声定位信号，随后在夏威夷瓦胡岛的卡内奥赫湾进行了测量。卡内奥赫湾的环境噪声水平通常比圣地亚哥湾高12 - 17分贝。这头鲸鱼在被转移到卡内奥赫湾后，通过转向更高的频率和强度展示了其生物声纳的适应性。在圣地亚哥，这头动物发出的回声定位信号峰值频率在40至60千赫之间，带宽在15至25千赫之间。在卡内奥赫湾，这头鲸鱼将其信号频率提高了大约一个八度，峰值频率在100至120千赫之间，带宽在20至40千赫之间。在卡内奥赫湾测量到的信号强度比在圣地亚哥高18分贝。所收集的数据代表了鲸类生物声纳系统适应能力的首个定量证据。
