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首页> 美国卫生研究院文献>Scientific Reports >A sublethal dose of a neonicotinoid insecticide disrupts visual processing and collision avoidance behaviour in Locusta migratoria
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A sublethal dose of a neonicotinoid insecticide disrupts visual processing and collision avoidance behaviour in Locusta migratoria

机译：亚致死剂量的新烟碱类杀虫剂破坏了蝗虫的视觉加工和避免碰撞行为

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Neonicotinoids are known to affect insect navigation and vision, however the mechanisms of these effects are not fully understood. A visual motion sensitive neuron in the locust, the Descending Contralateral Movement Detector (DCMD), integrates visual information and is involved in eliciting escape behaviours. The DCMD receives coded input from the compound eyes and monosynaptically excites motorneurons involved in flight and jumping. We show that imidacloprid (IMD) impairs neural responses to visual stimuli at sublethal concentrations, and these effects are sustained two and twenty-four hours after treatment. Most significantly, IMD disrupted bursting, a coding property important for motion detection. Specifically, IMD reduced the DCMD peak firing rate within bursts at ecologically relevant doses of 10 ng/g (ng IMD per g locust body weight). Effects on DCMD firing translate to deficits in collision avoidance behaviours: exposure to 10 ng/g IMD attenuates escape manoeuvers while 100 ng/g IMD prevents the ability to fly and walk. We show that, at ecologically-relevant doses, IMD causes significant and lasting impairment of an important pathway involved with visual sensory coding and escape behaviours. These results show, for the first time, that a neonicotinoid pesticide directly impairs an important, taxonomically conserved, motion-sensitive visual network.
机译：已知新烟碱类会影响昆虫的航行和视觉，但是尚未完全了解这些作用的机制。蝗虫中的视觉运动敏感神经元降落对侧运动检测器（DCMD）整合了视觉信息，并参与引发逃避行为。 DCMD从复眼接收编码输入，并单突触地激发涉及飞行和跳跃的运动神经元。我们显示吡虫啉（IMD）会在致死浓度下损害视觉刺激的神经反应，并且这些作用在治疗后两小时和二十四小时会持续。最重要的是，IMD破坏了突发，这是对运动检测很重要的编码属性。具体来说，在生态相关剂量10 µng / g（每克蝗虫ng IMD ng）下，IMD降低了爆发期间DCMD峰值发射速率。对DCMD射击的影响转化为避免碰撞行为的缺陷：暴露于10µng / g IMD会减弱逃生动作，而100µng / g IMD会阻止飞行和行走的能力。我们表明，在与生态有关的剂量下，IMD会导致与视觉感觉编码和逃避行为有关的重要途径的重大而持久的损伤。这些结果首次表明，新烟碱类农药直接损害了重要的，分类学上保守的，对运动敏感的视觉网络。

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