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首页> 外文期刊>Marine biology >Locomotor kinematics and behaviour in the escape response of European sea bass, Dicentrarchus labrax L., exposed to hypoxia
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Locomotor kinematics and behaviour in the escape response of European sea bass, Dicentrarchus labrax L., exposed to hypoxia

机译：暴露于低氧条件下欧洲鲈鱼Dicentrarchus labrax L.逃避响应的运动学运动学和行为

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To assess the effect of oxygen reduction on the escape response of sea bass, Dicentrarchus labrax, an integrative experimental approach was employed. The effect of hypoxia was tested on locomotor variables, i.e. cumulative distance (D), maximum swimming speed (V_(max)) and maximum acceleration (A_(max)). Behavioural variables, such as responsiveness (i.e. the proportion of individuals responding out of the total number of fish tested), response latency (i.e. the time interval between stimulus onset and the first detectable movement leading to the escape of the animal) and directionality (i.e. the proportion of escape responses in which the first detectable movement of the head was oriented away or towards the stimulus at its onset) were also considered. Four levels of oxygen were used: > 85% (i.e. normoxia, the control treatment), 50, 20 and 10% of air saturation. Sea bass responsiveness decreased significantly at 10% of air saturation, while hypoxia did not have any effect on the response latency. At the onset of the escape response, the proportion of away/towards responses was random when oxygen was ≤ 50% of air saturation, suggesting an impairment of the left-right discrimination. Whatever the level of hypoxia, none of the locomotor variables (i.e. D, V_(max) and A_(max)) was significantly different from normoxia. Our study suggests that hypoxia may reduce sea bass elusiveness facing a predator by directly affecting its escape behaviour, possibly related to an impairment of the mechano-sensory performance and/or in the Mauthner cells involved in triggering the escape response.
机译：为了评估氧气减少对鲈鱼Dicentrarchus labrax逃逸响应的影响，采用了综合实验方法。测试了低氧对运动变量的影响，即累积距离（D），最大游泳速度（V_（max））和最大加速度（A_（max））。行为变量，例如响应能力（即，响应的个体占被测鱼总数的比例），响应潜伏期（即刺激发作与导致动物逃逸的首次可检测运动之间的时间间隔）和方向性（即，还考虑了逃逸反应的比例，在该比例中，头的第一个可检测到的运动在发生时朝向或远离刺激。使用了四种氧气水平：> 85％（即正常氧，正常处理），50％，20％和10％的空气饱和度。空气饱和度为10％时，鲈鱼响应能力显着降低，而缺氧对响应潜伏期没有任何影响。在逃生反应开始时，当氧气≤空气饱和度的50％时，离开/朝上反应的比例是随机的，这表明左右分辨力受到损害。无论缺氧水平如何，运动变量（即D，V_（max）和A_（max））均与常氧无明显差异。我们的研究表明，低氧可能通过直接影响捕食者的逃避行为而降低其面对海鲈的难度，这可能与机械感官性能受损和/或触发逃避反应的Mauthner细胞受损有关。

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