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尾羽颜色标志着蓝山雀雏鸟的表现。

Tail colour signals performance in blue tit nestlings.

机构信息

Department of Biology, University of Turku, Turku, Finland.

HiLIFE Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland.

出版信息

J Evol Biol. 2019 Sep;32(9):913-920. doi: 10.1111/jeb.13489. Epub 2019 Jun 12.

Abstract

Indirect sexual selection arises when reproductive individuals choose their mates based on heritable ornaments that are genetically correlated to fitness. Evidence for genetic associations between ornamental colouration and fitness remains scarce. In this study, we investigate the quantitative genetic relationship between different aspects of tail structural colouration (brightness, hue and UV chroma) and performance (cell-mediated immunity, body mass and wing length) in blue tit (Cyanistes caeruleus) nestlings. In line with previous studies, we find low heritability for structural colouration and moderate heritability for performance measures. Multivariate animal models show positive genetic correlations between the three measures of performance, indicating quantitative genetic variation for overall performance, and tail brightness and UV chroma, two genetically independent colour measures, are genetically correlated with performance (positively and negatively, respectively). Our results suggest that mate choice based on independent aspects of tail colouration can have fitness payoffs in blue tits and provide support for the indirect benefits hypothesis. However, low heritability of tail structural colouration implies that indirect sexual selection on mate choice for this ornament will be a weak evolutionary force.

摘要

当生殖个体根据与适合度遗传相关的可遗传装饰物来选择配偶时,就会产生间接的性选择。关于装饰颜色与适合度之间存在遗传关联的证据仍然很少。在这项研究中,我们研究了蓝山雀(Cyanistes caeruleus)雏鸟的尾巴结构颜色(亮度、色调和 UV 色度)和性能(细胞介导的免疫、体重和翅膀长度)的不同方面之间的定量遗传关系。与之前的研究一致,我们发现结构颜色的遗传力较低,而性能指标的遗传力中等。多变量动物模型显示,性能的三个指标之间存在正遗传相关性,表明整体性能具有定量遗传变异,而尾巴亮度和 UV 色度两个遗传独立的颜色指标与性能呈遗传相关性(分别为正相关和负相关)。我们的研究结果表明,基于尾巴颜色独立方面的配偶选择可以在蓝山雀中带来适合度回报,并为间接利益假说提供支持。然而,尾巴结构颜色的遗传力较低意味着,这种装饰物的配偶选择的间接性选择将是一种较弱的进化力量。

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