相关实验视频

Updated: Jul 19, 2025

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Published on: May 7, 2016

在新热带Serrasalmidae鱼类 (Ostariophysi, Characiformes) 生物多样化中,型变化的宏观进化后果

Uedson Pereira Jacobina¹, Alany Itala Pontes², Lucas Costa³

¹Laboratory of Molecular Integrative Systematics, Federal University of Alagoas, Campus Arapiraca, Arapiraca, 57076-100, Brazil. uedson.jacobina@penedo.ufal.br.

|August 11, 2023

概括

染色体变化,特别是上升性失育症,在淡水鱼家族Serrasalmidae的进化多样化中发挥了关键作用. 这些变化,特别是某些属的稳定染色体数量,推动了克拉多发生和物种化.

科学领域:

鱼类学鱼类学鱼类学
进化生物学进化生物学
细胞遗传学细胞遗传学

背景情况:

新热带家庭Serrasalmidae,包括多样化的淡水鱼类,表现出显著的型变化 (2n=54至64).
在Serrasalmidae体内,染色体进化和克拉多基因事件之间的关系仍未得到充分研究.

研究的目的:

为了研究染色体变化的作用在Serrasalmidae的进化多样化.
为了与染色体数量演变一起重建遗传学和生物地理历史.

主要方法:

对36种Serrasalmidae物种进行了家族遗传学分析.
祖先染色体数的重建.
生物地理的重建.

主要成果:

遗传学分析确定了三个主要的分类.
祖先染色体数被重建为2n=54,在衍生血统中经常出现上升性失调症.
生物地理重建表明亚马逊起源 (48-38万年前) 和随后的殖民 (15-8万年前).
观察到,米奥森时代的多样化速度增加,与*Serrasalmus*和*Pygocentrus*的稳定2n=60有关,但与新环境殖民化无关.

结论:

染色体重排,特别是失配症,是 Serrasalmidae 中克拉多遗传事件和多样化的重要驱动因素.
在特定的属 (*Serrasalmus*, *Pygocentrus*) 中,稳定的染色体数量 (2n=60) 与米奥生时期多样化率的增加相关.

关键词:

升级性失调症 (Ascending Dysploidy) 是一种上升性失调症.职业演变是如何发生的新热带地区的鱼类.皮拉尼亚海豚 (Piranhas) 是一个类动物.

更多相关视频

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Published on: May 13, 2016

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

Published on: July 20, 2017

相关概念视频

Speciation Rates

Speciation Rates

Genetics of Speciation

Genetics of Speciation

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

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.

Formation of Species

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.

What is Evolutionary History?

What is Evolutionary History?

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.

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.