- 期刊
Song Structure and Microgeographic Variation in a Population of the Grey-cheeked Fulvetta (Alcippe morrisonia) at Shoushan Nature Park, Southern Taiwan
並列摘要
Song structure and microgeographic variation in a population of the Grey-cheeked Fulvetta (Alcippe morrisonia) at Shoushan Nature Park, southern Taiwan. Zoological Studies 43(1): 132-141. This study examined the sonogram structure and microgeographic variation of songs of the Grey-cheeked Fulvetta (Alcippe morrisonia) at Shoushan Nature Park, southern Taiwan during March-July 2001. A typical song of the Grey-cheeked Fulvetta contained 2 distinct phrases, the 1st a whistled phrase and the 2nd a harmonic one. All recorded songs contained the whistled phrase, whereas some songs contained no harmonic phrase. Furthermore, within a bird sample (recorded from the same location), the number of syllables was consistent, whereas the number of syllables in the harmonic phrase was variable. Thus, song types, which were used for analyzing microgeographic patterns, were classified based on the whistled phrase without considering the harmonic phrase. The results of cluster analysis of song types revealed 2 song themes in this population: northern and southern. Major discrete boundaries could be illustrated based on these 2 themes, representing 2 major dialects. Furthermore, the northern theme group was subdivided by a minor boundary, and 2 small clusters of neighboring birds constituted subdialectal nuclei in which bird samples demonstrated the same song types. In the study population, dispersal across a control line between the 2 major dialects was unrestricted, but there was a dialect boundary in the absence of a geographic barrier in the study area.