新陈代谢金发区:新陈代谢在Ambystoma中的演变
Thom A Lyons1, Kevin Arbuckle1
1Department of Biosciences, Faculty of Science and Engineering Swansea University Swansea UK.
Ecology and evolution
|April 9, 2024
概括
摩尔 salamanders (Ambystoma) 中的neoteny与狭窄,低度范围和减少息地多样性有关. 选择性新陈代谢是非新陈代谢和强制性新陈代谢状态之间的关键进化步骤.
科学领域:
- 进化生物学 进化生物学
- 发展生物学 发展生物学
- 类学 类学 类学 类学
背景情况:
- 在 salamanders (Ambystoma) 中观察到Neoteny,保留幼虫特征到性成熟,观察到 salamanders (Ambystoma).
- 安比斯托马物种表现出多种不同的新生态策略 (非新生态,选择性,强制性),为进化研究提供了一个模型.
- 影响Neoteny演变的因素,包括地理分布和杂交,仍然不完全理解.
研究的目的:
- 调查Ambystoma中neoteny与高度/度分布,洞穴隔离和多重合体性之间的关联.
- 为了确定neoteny是否影响一种物种可访问的息地多样性.
- 分析不同新陈代谢状态之间的进化路径和过渡速率.
主要方法:
- 遗传学比较方法被用来分析进化关系和特征.
- 收集了关于物种分布,息地,新生态状况和繁殖的数据.
- 估计了neotenic状态 (非neotenic,可选,有义务) 之间的过渡率.
主要成果:
- 尼奥特尼在狭窄的度带 (20-30°北) 中普遍存在,有义务的尼奥特尼显示更窄的范围 (16-52°北).
- 选择性neoteny与更高的海拔相关,而增加的neoteny频率与较低的息地多样性相关.
- 进化过渡有利于选择性新陈代谢作为中间体,但强制性新陈代谢比它进化更频繁地丢失.
结论:
- 低度和稳定的水生环境可能会促进新的进化.
- 尼奥特尼可能会将物种限制在特定的中,从而限制整体息地多样性.
- 选择性新陈代谢是关键的过渡阶段,而强制性新陈代谢在进化上是不稳定的,容易丢失.
相关概念视频
01:07Speciation Rates
21.2K
Overview
21.2K
01:54Convergent Evolution
27.7K
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.
27.7K
02:31Synteny and Evolution
3.3K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
3.3K
02:55The Evidence for Evolution
42.7K
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.
42.7K
01:23Phylogeny
44.0K
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.
44.0K
02:37Gene Duplication and Divergence
6.1K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.1K