扩大后代阐明了Deinosuchus的关系,鱼的度调节和身体大小的进化
Jules D Walter1,2, Tobias Massonne3, Ana Laura S Paiva4
1Dipartimento di Scienze della Terra, Università di Torino, Via Valperga Caluso 35, I-10125, Torino, Italy. julesdenis.walter@unito.it.
Communications biology
|April 24, 2025
概括
巨大的鱼型鱼Deinosuchus很可能容忍盐水,与淡水鱼不同. 这种新的系系学解释了Deinosuchusus的存在.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 脊椎动物动物学 脊椎动物动物学
背景情况:
- 晚白时期的鱼形鱼Deinosuchus表现出跨海分布和巨型,这对其与淡水,体型较小的鱼类的推断后遗传关系构成了挑战.
- 以前的遗传学分析一直将Deinosuchus置于或与Alligatoroidea密切相关,从而与其生态和形态特征产生冲突.
研究的目的:
- 重新评估Deinosuchus的遗传学位置,使用扩展的遗传学与改善的时空连贯性.
- 调查鱼及其亲属中度调节的演变,特别是针对Deinosuchus和鱼类的盐水耐受性.
- 分析鱼体内体型的进化模式及其与生态系统生产力的相关性.
主要方法:
- 构建一个扩展的家族遗传树,包括化石鱼,包括Deinosuchus, Leidyosuchus canadensis和Diplocynodon spp.
- 对度调节的遗传学分析,推断盐水耐受性及其随后的损失.
- 使用头宽代理来估计身体长度,用于遗传学身体长度分析.
主要成果:
- Deinosuchus物种被重新解释为干组鱼,与皇冠组鱼不同.
- 基因组学表明Deinosuchus和皇冠组鱼类的形盐水耐受性,干组鱼类的二次损失.
- 鱼类的分歧与白纪中期的海平面高位相吻合,而Deinosuchus在西部内陆海道的分布是由海洋分散解释的.
- 遗传学体长度分析表明,鱼类的早期进化过程中存在种类矮体,并提供了Deinosuchus riograndensis的尺寸估计.
- 鱼的巨大性与高生产力的水生生态系统相关.
结论:
- 修订后的分类学解决了Deinosuchus的形态/分布及其分类学位置之间的冲突.
- 盐水耐受性可能是早期鱼类的形特征,鱼类进化了次要的淡水适应性.
- 鱼类的进化和Deinosuchus的分布与白时期的海平面波动和海洋分散有关.
相关概念视频
03:21Phylogenetic Trees
44.8K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
44.8K
01:23Phylogeny
43.3K
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.
43.3K
01:54Convergent Evolution
27.1K
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.
27.1K
02:54Evolutionary Relationships through Genome Comparisons
5.6K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.6K
02:31Synteny and Evolution
3.1K
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...
3.1K
02:35What is Evolutionary History?
35.9K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
35.9K