Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
Department of Clinical Sciences and Center for Marine Sciences and Technology, College of Veterinary Medicine, North Carolina State University, Morehead City, North Carolina 28557, USA.
JASA Express Lett. 2024 Aug 1;4(8). doi: 10.1121/10.0028321.
Freshwater turtles exhibit temporary threshold shifts (TTS) when exposed to broadband sound, but whether frequency-restricted narrowband noise induces TTS was unknown. Underwater TTS was investigated in two freshwater turtle species (Emydidae) following exposures to 16-octave narrowband noise (155-172 dB re 1 μPa2 s). While shifts occurred in all turtles at the noise center frequency (400 Hz), there were more instances of TTS and greater shift magnitudes at 12 octave above the center frequency, despite considerably lower received levels. These frequency-specific data provide new insight into how TTS manifests in turtles and expand empirical models to predict freshwater turtle TTS.
淡水龟在暴露于宽带声音时会出现暂时阈移（TTS），但频率受限的窄带噪声是否会引起 TTS 尚不清楚。在对两种淡水龟（Emydidae）进行 16 倍频程窄带噪声（155-172dB 相对于 1μPa2s）暴露后，研究了水下 TTS。虽然在噪声中心频率（400Hz）处所有龟类都出现了偏移，但在中心频率以上 12 倍频程处，TTS 的发生频率更高，偏移幅度更大，尽管接收水平要低得多。这些具有频率特异性的数据为 TTS 在龟类中的表现提供了新的见解，并扩展了经验模型以预测淡水龟的 TTS。
