古老时代actinopterygian辐射的多样化动态
Joseph Flannery Sutherland1, Struan Henderson1, Sophie Fasey1
1School of Geography, Earth and Environmental Science, University of Birmingham, Birmingham B15 2TT, UK.
Proceedings. Biological sciences
|January 15, 2026
概括
早期的光鱼的多样化发生在德纪晚期,而不是石灰岩时期. 隐秘的血统生存,而不是爆炸性起源,解释了汉根堡灭绝事件后它们的多样性增加.
科学领域:
- 古生物学的古生物学
- 脊椎动物动物学 脊椎动物动物学
- 进化生物学 进化生物学
背景情况:
- 射翼鱼 (Actinopterygii) 是最多样化的脊椎动物群体,但它们的早期进化历史仍有争议.
- 化石证据表明碳期辐射,而植物遗传学研究则提出德纪晚期的起源.
- 调和这些观点需要分析化石数据的多样化率,尽管存在诸如采样偏差等挑战.
研究的目的:
- 通过使用化石发生数据推断无原始基因的类动物多样化速率.
- 测试关于早期光鱼辐射时间和驱动因素的假设.
- 为了评估跨越Hangenberg灭绝事件的血统生存.
主要方法:
- 对古老时代actinopterygian属和物种的综合数据集的分析.
- 应用统计方法来解释化石记录中的时间空间采样变化.
- 从化石事件中推断多样化速率的无原生学推断.
主要成果:
- 在德纪晚期发现了高水平的行动类生物多样化.
- 在Hangenberg灭绝期间,血统的存活率大于原始化石数据所指出的.
- 在灭绝事件发生后,没有发现起源率的显著正面转变.
结论:
- 早期的行动类类生物多样化起源于德纪晚期.
- 预先存在的血统的神秘生存,而不是爆炸性的新起源,解释了石灰岩时期的多样性增加.
- 化石记录的空间局限性,特别是欧美集成,影响我们对这些多样化模式的理解.
相关概念视频
01:27Diversity of Protists III
739
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
739
01:07Speciation Rates
22.6K
Overview
22.6K
01:27Diversity of Protists IV
754
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
754
01:27Diversity of Protists II
790
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
790
02:55The Evidence for Evolution
47.6K
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.
47.6K
01:15Diversity of Protists I
864
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
864