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1 July 2018 Geographic Variation in Yellow Bunting Songs
Shoji Hamao, Haruna Komatsu, Masanori Shinohara
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Abstract

In Japan, geographic variation in bird song is known only on small peripheral islands with isolated populations, and has not been reported in any species on the main islands of Japan, probably due to the close proximity of the populations on the relatively small main islands. On Honshu, one of the four main islands of Japan, the Yellow Bunting Emberiza sulphurata breeds in restricted habitats (i.e. wet grasslands with forest edge, or wet grasslands with sparse forest). This may facilitate the isolation of its populations and may have led to geographic variation in its songs. We investigated the acoustic characteristics of the songs of Yellow Buntings from four populations in central Honshu and found differences among the populations. For example, males at Nagaoka sang short songs with highly frequency-modulated notes, whereas males at Fuji sang long songs with poorly modulated notes. This study demonstrated geographic variation in bird songs on a small scale in mainland Japan. As songs are formed through cultural learning, local songs can arise in loose isolation or for short periods.

© The Ornithological Society of Japan 2018
Shoji Hamao, Haruna Komatsu, and Masanori Shinohara "Geographic Variation in Yellow Bunting Songs," Ornithological Science 17(2), 159-164, (1 July 2018). https://doi.org/10.2326/osj.17.159
Received: 21 April 2017; Accepted: 28 December 2017; Published: 1 July 2018
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KEYWORDS
Emberiza sulphurata
geographic variation
isolation
song
Yellow Bunting
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