相关实验视频

Updated: Jan 17, 2026

Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies

Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies

Published on: September 15, 2023

估计复杂性格的祖先状态:关于羽毛进化的案例研究

Pierre Cockx^1,2, Michael J Benton², Joseph N Keating²

¹Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China.

Systematic biology

|September 19, 2025

概括

鸟类的羽毛进化是有争议的,新的研究表明恐龙和类恐龙的独立起源. 这项研究阐明了估计羽毛起源的方法,支持最近的进化时间表.

科学领域:

进化生物学进化生物学
古生物学的古生物学
进行比较基因组学.

背景情况:

羽毛的进化起源,是鸟类的定义特征,是研究的一个重要领域.
目前的辩论集中在丝状整体是否在鸟类血统中独立进化了一次或多次.

研究的目的:

为了全面比较祖先状态估计 (ASE) 方法,以了解鸟类整体的进化.
测试外组包含,树时间缩放,模型选择和字符编码对ASE结果的影响.

主要方法:

将各种统计祖先状态估计方法应用于干鸟数据.
采用Akaike信息标准 (AIC) 和交叉验证 (LOOCV) 的比较模型.
评估了方法选择对祖先状态估计的影响.

主要成果:

祖先状态估计对树时间缩放,外组选择和模型选择非常敏感.
字符编码策略对祖先估计的影响不那么大.
分析支持恐龙和类恐龙中丝状体的独立起源.
与之前的估计相比,建议羽毛的进化起源较年轻.

结论:

在ASE分析中的方法选择对羽毛演变的解释产生了批判性的影响.
在非鸟类恐龙和龙中,有线状体的独立起源得到了支持.
该研究强调了在ASE研究中需要仔细选择外组,树和模型的必要性.

关键词:

祖先的状态估计估计.复杂的性格复杂的性格进行交叉验证.恐龙恐龙恐龙羽毛羽毛羽毛羽毛羽毛这是最大的可能性.遗传学上的比较方法.

更多相关视频

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Published on: May 31, 2014

Creating Avian Forebrain Chimeras to Assess Facial Development

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

相关概念视频

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Speciation Rates

Speciation Rates

The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Limits to Natural Selection

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.

Phylogeny

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.