Light conditions and the evolution of the visual system in birds.

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY
Evolution Pub Date : 2024-07-01 DOI:10.1093/evolut/qpae054
Arkadiusz Fröhlich, Simon Ducatez, Pavel Neˇmec, Daniel Sol
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引用次数: 0

Abstract

Despite vision being an essential sense for many animals, the intuitively appealing notion that the visual system has been shaped by environmental light conditions is backed by insufficient evidence. Based on a comprehensive phylogenetic comparative analysis of birds, we investigate if exposure to different light conditions might have triggered evolutionary divergence in the visual system through pressures on light sensitivity, visual acuity, and neural processing capacity. Our analyses suggest that birds that have adopted nocturnal habits evolved eyes with larger corneal diameters and, to a lesser extent, longer axial length than diurnal species. However, we found no evidence that sensing and processing organs were selected together, as observed in diurnal birds. Rather than enlarging the processing centers, we found a tendency among nocturnal species to either reduce or maintain the size of the two main brain centers involved in vision-the optic tectum and the wulst. These results suggest a mosaic pattern of evolution, wherein optimization of the eye optics for efficient light capture in nocturnal species may have compromised visual acuity and central processing capacity.

光照条件与鸟类视觉系统的进化。
尽管视觉是许多动物的基本感官,但视觉系统是由环境光条件塑造的这一直观概念却没有足够的证据支持。基于对鸟类系统发育的全面比较分析,我们研究了暴露于不同光照条件是否会通过对光敏感性、视觉敏锐度和神经处理能力的压力而引发视觉系统的进化分化。我们的分析表明,与昼伏夜出的鸟类相比,有夜行习性的鸟类进化出了角膜直径更大的眼睛,其次是轴长更长的眼睛。然而,我们没有发现任何证据表明,感觉器官和处理器官是一起被选择的,就像在昼行性鸟类中所观察到的那样。我们发现,夜行性物种不但没有扩大处理中心,反而倾向于缩小或保持与视觉有关的两个主要大脑中心--视网膜和视紫质--的大小。这些结果表明了一种马赛克进化模式,即在夜行性物种中,为有效捕捉光线而对眼睛光学进行的优化可能会损害视觉敏锐度和中枢处理能力。
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来源期刊
Evolution
Evolution 环境科学-进化生物学
CiteScore
5.00
自引率
9.10%
发文量
0
审稿时长
3-6 weeks
期刊介绍: Evolution, published for the Society for the Study of Evolution, is the premier publication devoted to the study of organic evolution and the integration of the various fields of science concerned with evolution. The journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.
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