Crown saturation and intrasexual dominance: Evidence of a negatively correlated handicap in male Saffron Finches

IF 1.6 2区 生物学 Q1 ORNITHOLOGY
Camilo Ernesto Espinosa , James Montoya Lerma , Hector Fabio Rivera-Gutierrez , Lorena Cruz-Bernate
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引用次数: 0

Abstract

Carotenoid-based plumage coloration may signal individuals’ overall body condition, influencing reproduction and survival of birds. In tropical species, little is known about the influence of color on social interactions and mate attraction. We evaluated the chromatic variation of 136 adult Saffron Finches (Sicalis flaveola) in Cali and Jamundí, Colombia. Our aim was to determine whether plumage coloration in this social, abundant, and widely distributed species is a signal used in mate choice and establishment of hierarchies. We predicted that there was intrasexual chromatic variation in crown and throat, and that individuals with higher saturation, regardless of sex, would be preferred by opposite sex and they would be dominant in intrasexual aggressive interactions, reflecting better condition. We quantified the reflectance of the crown and throat with visible and ultraviolet light (300–700 nm) subsequent to the molecular sex determination of each individual. Our results suggest that the chromatic variation in the crown and throat is explained by the perception of medium and long wavelengths in both sexes. Additionally, saturation is the color characteristic that best explains the chromatic variation. We formed duos of individuals based on chromatic contrast and conducted 23 mate choice experiments and 21 dominance experiments. The analysis of spectra and experiments revealed that dominance in males was associated with less saturated crowns. Our results reveal that in the Saffron Finches the “negatively correlated handicap” is a plausible hypothesis. Crown color appears to mediate dominance interactions, with less saturated males potentially taking greater risks to gain access to resources.
冠饱和和性内优势:雄性藏红花雀负相关障碍的证据
以类胡萝卜素为基础的羽毛颜色可能表明个体的整体身体状况,影响鸟类的繁殖和生存。在热带物种中,人们对颜色对社会互动和配偶吸引的影响知之甚少。对哥伦比亚Cali和Jamundí地区136只成年藏红花雀(Sicalis flaveola)的色变进行了研究。我们的目的是确定在这种社会性、数量丰富、分布广泛的物种中,羽毛的颜色是否是一种用于择偶和建立等级制度的信号。我们预测,雌雄同体的冠部和喉部存在色度变异,且色度较高的个体无论性别,都更容易受到异性的青睐,在雌雄同体的攻击互动中处于优势地位,反映出雌雄同体的条件较好。在确定每个个体的分子性别之后,我们用可见光和紫外光(300-700 nm)量化了冠和喉的反射率。我们的研究结果表明,冠部和喉部的颜色变化可以用两性对中长波长的感知来解释。此外,饱和度是最能解释颜色变化的颜色特征。在色差对比的基础上,进行了23次择偶实验和21次优势实验。光谱分析和实验分析表明,雄性的优势与较少饱和的树冠有关。我们的研究结果表明,在藏红花雀中,“负相关障碍”是一个合理的假设。冠状花序的颜色似乎是主导地位相互作用的中介,饱和度较低的雄性可能会冒更大的风险来获得资源。
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来源期刊
Avian Research
Avian Research ORNITHOLOGY-
CiteScore
2.90
自引率
16.70%
发文量
456
审稿时长
46 days
期刊介绍: Avian Research is an open access, peer-reviewed journal publishing high quality research and review articles on all aspects of ornithology from all over the world. It aims to report the latest and most significant progress in ornithology and to encourage exchange of ideas among international ornithologists. As an open access journal, Avian Research provides a unique opportunity to publish high quality contents that will be internationally accessible to any reader at no cost.
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