Evidence of repertoire sharing and stability despite a high turnover rate in a duetting neotropical wren

In songbirds, the spatial pattern of song sharing among individuals is influenced by the song learning and dispersal strategies within each species. In birds where females and males sing and create joint acoustic displays (duets), the processes defining the patterns of song sharing become more complex as there might be different selection pressures shaping the behaviour of each sex. To provide further insight into the vocal development and the dispersal strategy of duetting tropical species, we investigated the patterns of individual and pair repertoire sharing, as well as the stability of these repertoires, in a colour-marked population of riverside wrens, Cantorchilus semibadius, located in the Osa Peninsula, Costa Rica. Using data collected over a five-year period, we found considerable variation in the sharing levels of phrase and duet type repertoires among neighbouring individuals coupled with a general decline of repertoire sharing as distance increased between birds’ territories...在鸣禽中，个体间的鸣唱共享空间模式会受到各物种类群内部的鸣唱学习与扩散策略的影响。对于雌雄个体均会鸣唱并协同发出声学展示（duets，二重鸣唱）的鸟类而言，定义鸣唱共享模式的过程会更为复杂，因为不同性别可能面临不同的选择压力，进而塑造其行为表现。为进一步洞悉兼具二重鸣唱行为的热带鸟类的发声发育与扩散策略，我们对哥斯达黎加奥萨半岛上的河畔鹪鹩（Cantorchilus semibadius）带彩色标记种群展开了研究，分析了个体间以及配对间的鸣唱曲目共享模式，同时探究了此类曲目库的稳定性。通过收集长达五年的观测数据，我们发现邻近个体间的鸣唱短语与二重鸣唱类型曲目共享程度存在显著差异，且随着鸟类领域间距离的增加，鸣唱曲目共享程度普遍呈下降趋势……