Pigment concentrations only partially predict avian eggshell colour mimicry in a polymorphic host-brood parasite system.

IF 2.8 2区 生物学 Q2 BIOLOGY
Biology Letters Pub Date : 2025-06-01 Epub Date: 2025-06-11 DOI:10.1098/rsbl.2025.0112
Daniel Hanley, Mark E Hauber, Mandë Holford, Collins Moya, Claire N Spottiswoode, Tanmay Dixit
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引用次数: 0

Abstract

The precise mimicry of host eggshell colours and patterns by some obligate avian brood parasites provides a powerful study system for understanding co-evolutionary arms races. However, most attention has focused on host behaviour in response to mimicry, rather than the proximate mechanisms that give rise to mimetic eggshell colours and patterns. In Africa, the cuckoo finch Anomalospiza imberbis produces a wide range of eggshell colours that largely match those of one of its hosts, the tawny-flanked prinia Prinia subflava. Here, we use chemical analysis and avian visual modelling to determine how cuckoo finches and prinias produce this wide array of perceived eggshell colours. Although both species incorporate similar proportions of the two main egg pigments (biliverdin and protoporphyrin) into their eggshell matrix, the cuckoo finch deposits greater concentrations of pigments. Proportions of pigments predicted eggshell coloration only in bluer eggshells, whereas there was no statistical relationship between pigments and colours in browner eggshells. Possible explanations include that brown pigments are involved in maculation and/or strengthening the eggshell. Overall, variation in the deposition of eggshell pigments results in complex relationships between eggshell chemistry and avian-perceivable coloration, both within and across species in this system.

色素浓度只能部分预测多态寄主-寄主寄生系统中鸟类蛋壳颜色的模仿。
一些专性鸟类寄主对宿主蛋壳颜色和图案的精确模仿为理解共同进化军备竞赛提供了一个强有力的研究系统。然而,大多数注意力都集中在宿主对模仿的反应行为上,而不是引起模仿蛋壳颜色和图案的近似机制。在非洲,杜鹃雀(Anomalospiza imberbis)的蛋壳颜色与它的寄主之一、侧翼呈茶色的priia prinia subflava的蛋壳颜色非常相似。在这里,我们使用化学分析和鸟类视觉模型来确定杜鹃雀和大鸟是如何产生这种广泛的蛋壳颜色的。尽管这两个物种在蛋壳基质中含有两种主要的蛋色素(胆绿素和原卟啉)的比例相似,但杜鹃雀的色素含量更高。色素的比例仅在蓝色蛋壳中预测蛋壳的颜色,而在棕色蛋壳中色素和颜色之间没有统计关系。可能的解释包括棕色色素参与了斑纹和/或强化蛋壳。总的来说,蛋壳色素沉积的变化导致蛋壳化学和鸟类可感知的颜色之间的复杂关系,在这个系统中,无论是在物种内部还是在物种之间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biology Letters
Biology Letters 生物-进化生物学
CiteScore
5.50
自引率
3.00%
发文量
164
审稿时长
1.0 months
期刊介绍: Previously a supplement to Proceedings B, and launched as an independent journal in 2005, Biology Letters is a primarily online, peer-reviewed journal that publishes short, high-quality articles, reviews and opinion pieces from across the biological sciences. The scope of Biology Letters is vast - publishing high-quality research in any area of the biological sciences. However, we have particular strengths in the biology, evolution and ecology of whole organisms. We also publish in other areas of biology, such as molecular ecology and evolution, environmental science, and phylogenetics.
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