中文摘要：

该研究以红嘴相思鸟（Leiothrix lutea）为材料，分析对其鸣管神经支（NXIIts）进行断单侧和断双侧处理后的鸣声声学变化，探讨鸣管神经支配特性。结果表明，断单侧NXIIts后红嘴相思鸟均可发出常见叫声，但鸣声音节间隔拉长，音节时程缩短，调频指数下降，且断左侧NXIIts的作用效果明显大于断右侧NXIIts。即NXIIts支配具单侧性，且呈左侧优势，此外，左侧NXIIts还具有产生音节高频成分和谐波的作用。断双侧NXIIts后，红嘴相思鸟鸣声音调唯一，响度大幅下降，音节脉冲数增加。

英文摘要：

In this study, the unilateral and bilateral syrinx nerve （NXIIts） were resected in the red-billed Leiothrix （Leiothrix lutea） to assess the roles of NXIIts in vocalization. Wavesurfer and Sound Analysis Pro were used to analyze pre- and postsurgical acoustic changes. After resecting of unilateral NXIIts, red-billed Leiothrix produced the common calls with lengthened syllable interval, shortened duration and a declined FM index. The effects of left NXIIts resction on temporal and spectral characteristics of syllables were more significant than that of right NXIIts. These results indicated that the neural control of NXIIts was unilateral and left-side dominated. Moreover, the left NXIIts could produce high frequency components and harmonic waves. After resecting of bilateral NXIIts, the calls were characterized by monotone, reduced loudness and increased syllable pulse numbers.