Dark nests and conspicuousness in color patterns of nestlings of altricial birds
Dark nests and conspicuousness in color patterns of nestlings of altricial birds
复制标题
DOI：
10.1086/527493
复制
发表时间：
2008-03-01
影响因子：
2.9
通讯作者：
Soler, Juan J.
中科院分区：
文献类型：
--
作者：
Aviles, Jesus M.;Perez-Contreras, Tomas;Soler, Juan J.
巢的altricial鸟类表现出可变的光谱特性，可能会影响的效力（显着性）的彩色乞讨性状，雏鸟显示其父母。在这里，我们探讨了是否选择有效的感知有利于雏鸟颜色设计的演变，最大限度地提高雏鸟在可变光环境中的可检测性。视觉模型被用来估计父母如何感知的嘴，法兰，头部和胸部的雏鸟在他们的巢在21种欧洲鸟类的颜色。我们发现，最大的彩色和非彩色对比对巢的背景出现雏鸟嘴和法兰，分别。雏鸟的开放巢种表现出较大的一般非彩色对比的巢比雏鸟的洞巢种。然而，洞巢的雏鸟表现出更明显的非彩色对比翼缘和其他性状比开放巢的雏鸟。此外，具有较大窝卵数的物种表现出较大的一般非彩色对比与巢。开巢种的开口特征与巢的背景相比，在丰富的光照条件下比在穷人的感知。这些研究结果是一致的情况下，在黑暗的环境中，雏鸟检测选择有利于特定的非彩色组件的gape着色的演变，但也雏鸟性状，提高信号的效力，最大限度地提高雏鸟内的颜色对比。
Nests of altricial birds exhibit variable spectral properties that may affect the efficacy (conspicuousness) of the colored begging traits that a nestling displays to its parents. Here we explored whether selection for efficient perception has favored the evolution of nestling color designs that maximizes nestling detectability in variable light environments. Visual models were used to estimate how parents perceive the coloration of mouths, flanges, heads, and breasts of nestlings within their nest in 21 species of European birds. We show that the largest chromatic and achromatic contrasts against the nest background appeared for nestling mouths and flanges, respectively. Nestlings of open-nesting species showed a larger general achromatic contrast with the nest than did nestlings of hole-nesting species. However, nestlings of hole nesters showed a more evident achromatic contrast between flanges and other traits than did nestlings of open nesters. In addition, species with larger clutch sizes showed larger general achromatic contrasts with the nest. Gaping traits of open-nesting species contrasting with the nest background were better perceived under rich light regimes than under poor ones. These findings are consistent with a scenario in which selection for nestling detectability in dark environments has favored the evolution of particular achromatic components of gape coloration but also nestling traits that enhance signal efficacy by maximizing color contrasts within a nestling.