在坎布里亚浮游生物中的殖民绿藻
1Centre for Palaeobiology and Biosphere Evolution, School of Geography, Geology and the Environment, University of Leicester, University Road, Leicester LE1 7RH, UK.
Proceedings. Biological sciences
|October 25, 2023
概括
新坎布里亚微化石揭示了早期绿藻植物浮游生物形成的殖民地,挑战了关于古代海洋生态系统及其演变的先前假设.
科学领域:
- 古生物学的古生物学
- 海洋生物学 海洋生物学
- 微生物学 微生物学
背景情况:
- 埃迪亚卡拉-坎布里亚过渡时期发生了重大海洋生态系统变化,但坎布里亚植物浮游生物的多样性和作用仍然不清楚.
- 了解植物浮游生物的进化是解读早期动物生态系统动态的关键.
研究的目的:
- 为了研究鲜为人知的坎布里亚植物浮游生物的多样性,亲属性和生态.
- 探索古代海洋环境中动物相互作用和多样化驱动因素的作用.
主要方法:
- 从坎布里亚早期晚期 (大约) 保存得非常完善的acritarchs (有机壁的微化石) 的分析. 510万年前) 的时间.
- 微镜检查殖民组织,细胞排列,尺寸变化,装饰和细胞间连接.
主要成果:
- 发现了表现出殖民组织的acritarchs,它们的细胞以环和板块的形式相互连接.
- 将化石解释为代表特定的 (共生物) 殖民地形成,这种策略以前只在绿藻 (叶绿藻) 中已知.
- 证据表明,海洋绿藻植物浮游生物的收辐射与现代淡水形式不同.
结论:
- 坎布里亚时代的植物浮游生物,包括,并不是单细胞休息囊.
- 这些发现支持了绿藻植物浮游生物在古生物学早期的突出地位,与分子生物标志物预测保持一致.
- 殖民地植物浮游生物很可能适应了从侵入的坎布里亚元生动物增加的放牧压力.
更多相关视频
07:03Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer
Published on: November 12, 2021
2.4K
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
11.4K
相关概念视频
01:21Green Algae
26
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
26
01:19Other Algae
30
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
30
01:28Overview of Algae
25
The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
25
01:23Red Algae
38
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
38
01:27Diversity of Protists III
30
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,...
30
01:08The Anatomy of Chloroplasts
5.2K
Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of...
Structure of...
5.2K