Evolution of bower complexity and cerebellum size in bowerbirds
Evolution of bower complexity and cerebellum size in bowerbirds
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DOI：
10.1159/000085048
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发表时间：
2005-01-01
影响因子：
1.7
通讯作者：
Olster, DH
中科院分区：
文献类型：
--
作者：
Day, LB;Westcott, DA;Olster, DH
为了吸引雌鸟交配，雄性园丁鸟建造精心装饰的花园。在不同的物种中，凉亭的复杂性从简单的用树叶装饰的竞技场到复杂的用无数彩色物体装饰的树枝或草结构不等。为了探讨建造凉亭的神经基础，我们研究了全脑（WB），端脑减去海马（TH），海马（Hp）和小脑（Cb）的体积估计的变化的贡献，以解释5种凉亭的复杂性的差异。使用独立的对比，我们发现了一个显着的关系bower复杂性和Cb的大小。我们没有发现支持相关的进化之间的鲍尔复杂性和WB，TH，或Hp量。这些结果表明，由小脑支持的技能（e。例如，在一个实施例中，程序性学习、运动规划）有助于解释跨物种的bower复杂性的变化。考虑到雄性交配成功的一部分是由雌性选择的凉亭设计，我们的数据是一致的假设，性选择驱动扩大的小脑园丁鸟。版权所有（C）2005 S. Karger AG，巴塞尔。
To entice females to mate, male bowerbirds build elaborate displays ( bowers). Among species, bowers range in complexity from simple arenas decorated with leaves to complex twig or grass structures decorated with myriad colored objects. To investigate the neural underpinnings of bower building, we examined the contribution of variation in volume estimates of whole brain (WB), telencephalon minus hippocampus (TH), hippocampus ( Hp) and cerebellum (Cb) to explain differences in complexity of bowers among 5 species. Using independent contrasts, we found a significant relationship between bower complexity and Cb size. We did not find support for correlated evolution between bower complexity and WB, TH, or Hp volume. These results suggest that skills supported by the cerebellum ( e. g., procedural learning, motor planning) contribute to explaining the variation in bower complexity across species. Given that male mating success is in part determined by female choice for bower design, our data are consistent with the hypothesis that sexual selection has driven enlargement of the cerebellum in bowerbirds. Copyright (C) 2005 S. Karger AG, Basel.