美国皮卡 (Ochotona princeps) 血统多样化的系谱学
Danielle A Schmidt1, Kurt E Galbreath2, Michael A Russello1
1Department of Biology, The University of British Columbia, Kelowna, BC, Canada.
Molecular phylogenetics and evolution
|February 10, 2024
概括
基因组数据揭示了美国皮卡 (Ochotona princeps) 的六个不同的血统,这些血统是由过去的气候变化形成的. 这项研究强调了需要重新评估皮卡的分类学,并了解它们在气候变化中的适应潜力.
科学领域:
- 生态学和进化生物学
- 基因组学就是基因组学.
- 气候变化生物学 气候变化生物学
背景情况:
- 四级气候振荡显著影响物种分布和驱动范围的变化,导致山地物种的内部特异性多样化.
- 美国皮卡 (Ochotona princeps) 是一种热敏的形动物,经历了与环境变化相关的范围变化和人口减少,之前的研究确定了五种线粒体DNA血统.
研究的目的:
- 用全基因组数据重新检查美国皮卡 (Ochotona princeps) 的数量和分布.
- 为了研究美国皮卡斯在家族内和家族间的分歧和多样性的模式.
- 为Ochotona princeps提供基因组证据的单和血统结构.
主要方法:
- 全基因组数据分析使用25244个单核酸多态 (SNP).
- 美国皮卡种群的范围广泛采样.
- 遗传学重建以识别不同的血统并评估分歧时间.
主要成果:
- 基因组数据证实了Ochotona princeps的单系,重建了六个不同的血统.
- 证据表明多次分歧事件 (0.809-2.81万年前),包括一个新发现的中部落基山脉血统.
- 在多个空间尺度上显著的种群差异化和与其他小哺乳动物相比的常态遗传变异水平.
结论:
- 过去的冰川周期对美国皮卡 (Ochotona princeps) 血统多样化产生了深刻的影响.
- 美国皮卡目前的亚种类分类学可能需要根据基因组发现进行修订.
- 这项研究为评估美国皮卡在应对人类气候变化的适应潜力提供了关键的框架.
相关概念视频
Phylogenetic Trees
45.3K
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.
45.3K
Phylogeny
44.1K
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.
44.1K
Evolutionary Relationships through Genome Comparisons
5.7K
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...
5.7K
Speciation Rates
21.2K
Overview
21.2K
Gene Evolution - Fast or Slow?
7.1K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.1K
Convergent 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


