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首页> 外文期刊>BMC Evolutionary Biology >Evolution of ultraviolet vision in the largest avian radiation - the passerines
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Evolution of ultraviolet vision in the largest avian radiation - the passerines

机译：最大禽辐射紫外线视觉演变 - 旁角

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Background Interspecific variation in avian colour vision falls into two discrete classes: violet sensitive (VS) and ultraviolet sensitive (UVS). They are characterised by the spectral sensitivity of the most shortwave sensitive of the four single cones, the SWS1, which is seemingly under direct control of as little as one amino acid substitution in the cone opsin protein. Changes in spectral sensitivity of the SWS1 are ecologically important, as they affect the abilities of birds to accurately assess potential mates, find food and minimise visibility of social signals to predators. Still, available data have indicated that shifts between classes are rare, with only four to five independent acquisitions of UV sensitivity in avian evolution. Results We have classified a large sample of passeriform species as VS or UVS from genomic DNA and mapped the evolution of this character on a passerine phylogeny inferred from published molecular sequence data. Sequencing a small gene fragment has allowed us to trace the trait changing from one stable state to another through the radiation of the passeriform birds. Their ancestor is hypothesised to be UVS. In the subsequent radiation, colour vision changed between UVS and VS at least eight times. Conclusions The phylogenetic distribution of SWS1 cone opsin types in Passeriformes reveals a much higher degree of complexity in avian colour vision evolution than what was previously indicated from the limited data available. Clades with variation in the colour vision system are nested among clades with a seemingly stable VS or UVS state, providing a rare opportunity to understand how an ecologically important trait under simple genetic control may co-evolve with, and be stabilised by, associated traits in a character complex.
机译：背景技术禽颜色视觉中的差异变为两种分立类：紫色敏感（VS）和紫外敏感（UV）。它们的特征在于四个单锥体的最短波敏感性的光谱敏感性，SWS1似乎在锥形Opsin蛋白中的一个氨基酸取代的直接控制。 SWS1的光谱灵敏度的变化是生态的重要性，因为它们影响鸟类准确评估潜在伴侣的能力，找到食物，并尽量减少社会信号的可见性。尽管如此，可用数据表明类之间的班次罕见，只有四到五个独立于禽流速进化中的紫外线敏感性。结果我们从基因组DNA分类为VS或UV的大量样品，并在从公开的分子序列数据推断的paserrine Phylogy上映射了该角色的演变。测序小基因片段使我们通过辐射通过路边鸟的辐射来追踪从一个稳定状态转变为另一个稳定状态的特征。他们的祖先被假设是紫外线。在随后的辐射中，颜色视觉在UV和VS之间发生变化至少八次。结论Passoriformes中SWS1锥形OPSIN类型的系统发育分布在禽颜色视觉演变中的复杂程度高于先前从可用的有限数据中指出的内容。具有彩色视觉系统变化的片状呈现出看似稳定的与紫外线状态的片状，提供难得理解在简单的遗传控制下的生态重要性状如何与相关的特征相加的生态学上重要的性状如何稳定一个角色复杂。

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