The role of sex steroid in two avian song behaviours differing in ontogenetic process

The male Bengalese finch,Lonchura striata, has two types of song behaviour (directed song, DS and undirected song, US). DS and US share a basically identical syllable repertoire, sequence pattern and tempo, but differ in the time course of appearance during the maturational process. In order to examine whether this results from a difference in testosterone (T) dependency, we studied developmental changes in the fecal T level and the amounts of DS and US during the 2–4 month period (N=7). DS appeared between 83 and 94 days of age, 4–16 days after a rise in the fecal T level. In contrast, US appeared earlier and at high frequency even when T was still at a very low level. These results suggest that DS is more dependent on the T level than US, and is not activated until the T level rises during the maturational process.     

朱雀鸣声声谱与语图的初步分析

利用计算机声音分析技术对朱雀的求偶歌唱、害怕时的惊叫声和正常联系声进行了分析,以探讨鸣声特征与行为的关系。朱雀的歌唱婉转多变,频率范围在２．５－１０．５ｋＨｚ之间;惊叫声尖厉,频率范围在２．４－８．０ＫＨｚ之间;正常联系声频率范围在２．０－６．５ｋＨｚ之间。     

损毁成年白腰文鸟前脑界面核对鸣曲复杂性的影响?

双侧电损毁成年雄性白腰文鸟(Lonchura striata)界面核NIf(nucleus interfacialis nidopallii),比较损毁前后鸣曲声谱的结构变化以及对声谱参数进行分析,以了解NIf损毁后对鸣唱行为的影响.结果显示:1)短语层面(phraselevel)上发生了长期的简化,音节出现变形并且趋向于同一种音节,音节有严重缺失;2)损毁30d后非典型鸣曲出现大量缺失或缩短,其中部分非典型鸣曲的时长变短并且音节也出现变形;3)损毁后鸣曲音节噪音化,参数中平均频率升高,熵值降低.以上结果表明,损毁NIf显著降低了白腰文鸟鸣曲的复杂性,提示NIf在复杂鸣曲的维持中有重要的生理功能.     

鸟鸣叫声特征提取方法的研究

鸟鸣叫声的研究和分析方法对开展鸟类学工作有极其重要的作用.通过对鸟鸣叫声进行功率谱分析、声谱分析、Mel倒谱分析和主成分分析,从而对鸟鸣叫声特征参数进行提取,为鸟鸣叫声的个体识别以及鸣叫声与鸟类行为的关系研究提供了有力的技术支持.