Active Process Mediates Species-Specific Tuning of Drosophila Ears
Active Process Mediates Species-Specific Tuning of Drosophila Ears
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DOI：
10.1016/j.cub.2011.03.001
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发表时间：
2011-04-26
期刊：
影响因子：
9.2
通讯作者：
Albert, Joerg T.
中科院分区：
文献类型：
--
作者：
Riabinina, Olena;Dai, Mingjie;Albert, Joerg T.
果蝇的求偶行为长期以来一直是研究动物交流基础的模型[1]。在求偶过程中，雄蝇拍打翅膀，向雌蝇的触角耳朵发送一种复杂的空气振动模式。这些“求偶歌”在不同物种间的谱时组成不同，被认为是果蝇交配前障碍的重要组成部分[2，3]。然而，鸣唱结构的种属差异是否也反映在这种交流系统的接收者身上，即，苍蝇的触角耳朵还未被探索在这里，我们展示了黑腹果蝇物种组的七个成员，（1）它们的耳朵被机械地调谐到不同的最佳频率，（2）耳朵的最佳频率与同种求偶歌曲的高频脉冲相关，（3）物种特异性调谐依赖于来自果蝇听觉神经元的放大机械反馈。由于其水平依赖性[4，5]，主动机械反馈放大对于检测小刺激（例如同种鸣叫脉冲）特别有用，并且对于感测较大刺激（例如飞行期间苍蝇自己的翼拍）变得可以忽略不计。
The courtship behavior of Drosophilid flies has served as a long-standing model for studying the bases of animal communication [1]. During courtship, male flies flap their wings to send a complex pattern of airborne vibrations to the antennal ears of the females. These "courtship songs" differ in their spectrotemporal composition across species and are considered a crucial component of the flies' premating barrier [2, 3]. However, whether the species-specific differences in song structure are also reflected in the receivers of this communication system, i.e., the flies' antennal ears, has remained unexplored. Here we show for seven members of the melanogaster species group that (1) their ears are mechanically tuned to different best frequencies, (2) the ears' best frequencies correlate with high-frequency pulses of the conspecific courtship songs, and (3) the species-specific tuning relies on amplificatory mechanical feedback from the flies' auditory neurons. As a result of its level-dependent nature [4, 5], the active mechanical feedback amplification is particularly useful for the detection of small stimuli, such as conspecific song pulses, and becomes negligible for sensing larger stimuli, such as the flies' own wingbeat during flight.