Acoustic structure of songs in island populations of the Japanese bush warbler, Cettia diphone, in relation to sexual selection.
Acoustic structure of songs in island populations of the Japanese bush warbler, Cettia diphone, in relation to sexual selection.
复制标题
日本丛林莺（Cettia diphone）岛屿种群的歌曲声学结构与性选择的关系。
DOI：
10.1007/s10164-012-0341-1
复制
发表时间：
2013
影响因子：
0.9
通讯作者：
Shoji Hamao
中科院分区：
文献类型：
--
作者：
1. Itayama;S.;S. Matsuzuka;Y. Hirokawa;S. Fujiwara;K. Nakanishi;and M. Tauzuki;Shoji Hamao
据报道，海岛鸟类的歌唱经常被简化，因为与大陆鸟类相比，海岛鸟类的歌唱类型和歌唱元素类型较少。然而，关于海岛歌曲声学结构特征的研究较少。我研究了日本灌木林莺Cettia diphone的一个大陆种群和三个岛屿种群的歌声结构，发现岛屿歌声的结构在声学上很简单。与大陆人口相比，岛屿人口的调频部分(FM)较短，频率变化较少，而FM音符的数量、这些音符的频率范围以及男性的歌曲曲目大小在岛屿和大陆之间没有差别。我还研究了歌曲的复杂性是否与性选择压力有关，将性大小的二形性程度作为后者的替代指标。在大陆，身体质量的二型性程度更大。因此，岛屿上的性选择减弱可能是形成简单歌曲的一个因素。还需要进一步研究有关岛上男女竞争和女性选择的问题。
Bird songs in island populations have often been reported to be simplified, in that island birds have a smaller number of song types and song-element types compared to mainland birds. However, there is less information on the characteristics of acoustic structure in island songs. I investigated song structure of one mainland and three island populations of Japanese bush warblers,Cettia diphone, and found that island songs had an acoustically simple structure. The frequency-modulated (FM) portions of the songs were shorter and had fewer frequency inflections in the insular populations than in the mainland population, while the number of FM notes, the frequency range of these notes, and the song repertoire sizes of males did not differ between the islands and the mainland. I also investigated whether the song complexity is related to sexual selection pressure using the degree of sexual size dimorphism as a proxy for the latter. The degree of dimorphism in body mass was larger on the mainland. Thus, weakened sexual selection on islands is a possible factor in the formation of simple songs. Further studies related to male–male competition and female choice on islands are required.