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首页> 外文OA文献 >Inner Ear Otolith Asymmetry in Late-Larval Cichlid Fish (Oreochromis mossambicus, Perciformes) Showing Kinetotic Behaviour Under Diminished Gravity
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Inner Ear Otolith Asymmetry in Late-Larval Cichlid Fish (Oreochromis mossambicus, Perciformes) Showing Kinetotic Behaviour Under Diminished Gravity

机译：后期幼体丽鱼科鱼类（Oreochromis mossambicus，perciformes）的内耳耳石不对称性显示在重力降低下的运动行为

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The inner ears of all vertebrates are designed to perceive auditory and vestibular inputs. Although a tremendous diversity in the inner ear can be found even among bony fishes, the morphologies of the utricle and of the semicircular canals are rather conservative among vertebrates. Fish show kinetoses under reduced gravity (spinning movements and looping responses) and are regarded model organisms concerning the performance of the otolithic organs. Otoliths can be analysed easily because they are compact, in contrast to the otoconial masses of other vertebrates. Here, late-larval Oreochromis mossambicus were subjected to 0.0001 × g and 0.04 × g aboard a sounding rocket, their behavior was observed and morphometrical analyses on otoliths were carried out. Fish swimming kinetotically at 0.0001 × g had a higher asymmetry of utricular otoliths (gravity perception) but not of saccular otoliths (hearing process) than specimens behaving normally at this gravity level (p = 0.0055). Also, asymmetries of lapilli in animals swimming normally at 0.0001 × g were lower than asymmetries in specimens swimming normally at 0.04 × g (p = 0.06). This supports the “otolith asymmetry hypothesis”, an explanation for the susceptibility to kinetosis, particularly concerning the utricular otoliths. It would be interesting to identify processes generating asymmetric otoliths, also in regard to\udhuman motion sickness.
机译：所有脊椎动物的内耳均设计为可感知听觉和前庭输入。尽管甚至在骨鱼类中在内耳中都可以发现巨大的多样性，但是在脊椎动物中，囊的形状和半圆管的形态相当保守。鱼在降低的重力（旋转运动和循环响应）下显示出动糖，被认为是与耳石器官性能有关的模型生物。耳石很容易分析，因为它们很紧凑，这与其他脊椎动物的耳锥质量相反。在这里，晚生莫桑比克罗非鱼在探测火箭上受到0.0001×g和0.04×g的作用，观察它们的行为，并对耳石进行形态计量学分析。在0.0001×g动力下游泳的鱼，其耳耳石的不对称性（重力感知）比在该重力水平下正常表现的样品的耳耳石（听觉过程）的不对称性更高（p = 0.0055）。同样，正常以0.0001×g游泳的动物的lapilli的不对称性低于正常以0.04×g游泳的动物的标本的不对称（p = 0.06）。这支持了“耳石不对称性假说”，这是对动反应的敏感性的解释，特别是关于耳道耳石的解释。识别产生不对称耳石的过程也很有趣，这也涉及人类晕车病。

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