两种山鹪莺的繁殖参数比较

Comparisons of Breeding Parameters of Two Prinia Species

生活史是鸟类生态学研究的重要内容之一,分析生活史的影响因子对于研究鸟类的生态适应具有重要意义。2007年3~9月,在广东省肇庆市江溪村对黄腹山鹪莺(Prinia flaviventris)和纯色山鹪莺(P.inornata)的繁殖参数进行了比较研究。结果表明:1)除筑巢集中期、窝卵数、巢捕食率和割草毁巢率外,两种山鹪莺各繁殖参数均存在显著性差异;2)黄腹山鹪莺的窝卵数相对较小,但卵重较大,而纯色山鹪莺则相反;3)与体重相似的9种雀形目鸟类相比,两种山鹪莺具有相对较高的年生产力;4)两种山鹪莺在部分繁殖参数上出现了分化,这可能是它们对不同巢捕食风险的响应,黄腹山鹪莺的巢捕食率相对较高,采取低窝卵数和高的卵重,而纯色山鹪莺则为高的窝卵数和低的卵重。

Life history is an important topic in avian ecology, and the determinants of life history traits are important for understanding bird ecological adaption. Comparisons of breeding parameters of Yellow-bellied Prinia Prinia flaviventris and Plain Prinia P. inornata were performed at Jiangxi Village, Zhaoqing, Guangdong, from March to September in 2007. Our results showed that： 1） there were no significant differences in various breeding parameters between two Prinia, except for nest-building period, clutch size, nest predation rate and nest destruction rate（Table 1）; 2） Yellow-bellied Prinia had lower clutch size but larger egg size, compared with the Plain Prinia; 3） these two Prinia species had relatively higher annual productivity compared with nine passerine birds of similar body mass（Fig. 2）; 4） there was obvious differentiation between two Prinia species in most of breeding parameters, possibly caused by different nest predation risks. Our findings suggested that Yellow-bellied Prinia responded to relatively high nest predation with lower clutch size but larger egg size, while Plain Prinia had higher clutch size but smaller egg size.