Temperature effects on the tympanal membrane and auditory receptor neurons in the locust.
Temperature effects on the tympanal membrane and auditory receptor neurons in the locust.
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DOI：
10.1007/s00359-014-0926-y
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发表时间：
2014-09
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影响因子：
--
通讯作者：
Ronacher B
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文献类型：
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作者：
Eberhard MJ;Gordon SD;Windmill JF;Ronacher B
变温动物受到环境温度变化的影响，因为神经细胞和肌肉的基本特性发生了改变。然而，昆虫的感觉系统，如听觉系统，需要在广泛的温度范围内有效地发挥作用，因为高达10°C或更高的突然变化是常见的。研究了迁徙蝗听觉受体神经元和鼓膜对温度变化的响应。在21°C和28°C两种温度下对受体的细胞内记录显示，峰值速率适度增加，平均Q10为1.4。随着温度的升高，峰值速率-强度函数的阈值和动态范围的扩展都有小幅下降，而峰值持续时间则有所减少。用微扫描激光振动仪研究鼓膜位移，温度效应较小，Q10为1.2。这些发现表明，蝗虫受到听觉通路外围温度变化的影响，但对尖峰率、灵敏度和鼓膜位移的影响很小。对声音信号进行稳健编码的受体神经元只有轻微的温度依赖性，鼓膜特性几乎与温度无关，这可能使蝗虫和蚱蜢能够在体温变化的情况下可靠地识别声音。本文的在线版本（doi:10.1007/s00359-014-0926-y）包含补充材料，仅供授权用户使用。
Poikilothermic animals are affected by variations in environmental temperature, as the basic properties of nerve cells and muscles are altered. Nevertheless, insect sensory systems, such as the auditory system, need to function effectively over a wide range of temperatures, as sudden changes of up to 10 °C or more are common. We investigated the performance of auditory receptor neurons and properties of the tympanal membrane of Locusta migratoria in response to temperature changes. Intracellular recordings of receptors at two temperatures (21 and 28 °C) revealed a moderate increase in spike rate with a mean Q10 of 1.4. With rising temperature, the spike rate–intensity–functions exhibited small decreases in thresholds and expansions of the dynamic range, while spike durations decreased. Tympanal membrane displacement, investigated using microscanning laser vibrometry, exhibited a small temperature effect, with a Q10 of 1.2. These findings suggest that locusts are affected by shifts in temperature at the periphery of the auditory pathway, but the effects on spike rate, sensitivity, and tympanal membrane displacement are small. Robust encoding of acoustic signals by only slightly temperature-dependent receptor neurons and almost temperature-independent tympanal membrane properties might enable locusts and grasshoppers to reliably identify sounds in spite of changes of their body temperature. The online version of this article (doi:10.1007/s00359-014-0926-y) contains supplementary material, which is available to authorized users.