Ramcharitar John U, Higgs Dennis M, Popper Arthur N
Department of Biology & Neuroscience and Cognitive Science Program, University of Maryland, College Park, Maryland 20742, USA.
J Acoust Soc Am. 2006 Jan;119(1):439-43. doi: 10.1121/1.2139068.
We investigated how morphological differences in the auditory periphery of teleost fishes may relate to hearing capabilities. Two species of western Atlantic sciaenids were examined: weakfish (Cynoscion regalis, Block and Schneider) and spot (Leiostomus xanthurus, Lacepede). These species differ in the anatomical relationship between the swim bladder and the inner ear. In weakfish, the swim bladder has a pair of anterior horns that terminate close to the ear, while there are no extensions of the swim bladder in spot. Thus, the swim bladder in spot terminates at a greater distance from the ear when compared to weakfish. With the use of the auditory brainstem response technique, Cynoscion regalis were found to detect frequencies up to 2000 Hz, while Leiostomus xanthurus detected up to 700 Hz. There were, however, no significant interspecific differences in auditory sensitivity for stimuli between 200 and 700 Hz. These data support the hypothesis that the swim bladder can potentially expand the frequency range of detection.
我们研究了硬骨鱼类听觉外周的形态差异如何与听力能力相关。对两种西大西洋石首鱼科鱼类进行了检查：银花鱼（Cynoscion regalis，布洛克和施奈德）和斑鳟（Leiostomus xanthurus，拉塞佩德）。这些物种在鱼鳔与内耳的解剖关系上有所不同。在银花鱼中，鱼鳔有一对前角，其末端靠近耳朵，而斑鳟的鱼鳔没有延伸部分。因此，与银花鱼相比，斑鳟的鱼鳔末端离耳朵的距离更远。通过使用听觉脑干反应技术，发现银花鱼能够检测到高达2000赫兹的频率，而斑鳟能检测到高达700赫兹的频率。然而，对于200至700赫兹之间的刺激，种间听觉敏感性没有显著差异。这些数据支持了鱼鳔可能会扩大检测频率范围这一假设。
