Early rearing conditions affect the development of body size and song in Bengalese finches
Early rearing conditions affect the development of body size and song in Bengalese finches
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DOI：
10.1111/j.1439-0310.2006.01263.x
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发表时间：
2006-11-01
期刊：
影响因子：
1.7
通讯作者：
Okanoya, Kazuo
中科院分区：
文献类型：
--
作者：
Soma, Masayo;Takahasi, Miki;Okanoya, Kazuo
鸟鸣是一种音响装饰。根据指标模型，一个特质必须付出代价才能作为一个诚实的信号，但人们对精心制作的歌曲的潜在成本仍然知之甚少。发展压力假说表明，学习歌曲的特征可能是早期发展条件的一个诚实的指标，因为与学习歌曲相关的大脑结构容易受到早期发展压力的影响，从而影响歌曲的发展。与以前研究应激激素或限制营养的影响的发育应激研究不同，我们观察了圈养的半自然繁殖条件下的孟加拉雀，以研究早期饲养条件（例如，育雏大小和性别比例）和随后的个体之间的身体大小和歌曲的变化。我们的研究结果表明，早期饲养环境直接影响身体大小和歌曲的复杂性，而歌曲输出主要是由“身体大小”。这些结果支持了发展压力假说。此外，我们的研究结果首次表明，发展条件不仅影响音符类型的数量，而且还影响歌曲的句法复杂性。
Birdsong is an acoustic ornament. According to indicator models, a trait must be costly to act as an honest signal, but the potential costs of elaborate songs are still poorly understood. The developmental stress hypothesis Suggests that learned song characteristics Could be an honest indicator of early developmental conditions because the brain structures associated with learning songs are susceptible to early developmental stress, which could thus affect song development. Unlike previous studies of developmental stress that examined the effect of a stress hormone or restricted nutrition, we observed Bengalese finches under semi-natural breeding conditions in captivity to investigate the relationship between early rearing conditions (e.g., brood size and sex ratio) and the subsequent variation in body size and song among individuals. Our results suggest that the early rearing environment directly affects body size and song complexity, whereas song output is determined mainly by' body size. These results support the developmental stress hypothesis. Moreover, Our findings are the first to show that developmental condition affects not only the number of note types but also the syntactical complexity of the song.