与微囊殖民地相关的固促进了北美湖泊中有害的菌繁殖
Christopher J Gobler1, Ann Marie E Famularo-Pecora1, Benjamin J Kramer1,2
1School of Marine and Atmospheric Sciences, Stony Brook University, Southampton, New York 11968, United States.
Environmental science & technology
|January 22, 2026
概括
微囊的开花利用 (N2) 固定,特别是在低营养水中. 这种在殖民地内部发生的过程,对它们的繁殖有着显著的贡献,即使也存在.
科学领域:
- 环境微生物学 环境微生物学
- 水生生态学 水生生态学
- 生物地质化学生物地质化学
背景情况:
- 有害的蓝藻细菌繁殖,特别是微囊,是全球性的问题,通常发生在有限的环境中.
- 了解源对于管理开花动态及其生态影响至关重要.
研究的目的:
- 量化Microcystis殖民地内的 (N2) 固定率,并将其与自由生活的浮游生物进行比较.
- 为了研究N2固定和微囊殖民地吸收 (氨,酸盐,尿素) 之间的关系.
- 评估N2固定对Microcystis殖民地总同化的贡献.
主要方法:
- 在北美六个湖泊中,测量了N2固定率在孤立的Microcystis殖民地,自由生活的浮游生物和整个浮游生物群落中的三年时间.
- 评估了的吸收率,并进行了实验,以确定对N2固定的影响.
- 分析了与殖民地相关的稳定同位素比 (δ15N) 和量化 nifH 基因序列 (蓝菌和非蓝菌).
主要成果:
- 在Microcystis殖民地,N2固定率明显高于在大多数湖泊中自由生活的浮游生物.
- 氨的吸收与N2固定相反相关,的添加抑制了N2固定的50-85%.
- 殖民地中较低的δ15N值表明有偏好的14N2被diazotrophs同化. 2固化对殖民地的总同化贡献了平均18%.
结论:
- (N2) 固定是重要的源,支持微囊的繁殖,特别是在殖民地内.
- 殖民地相关的双菌在开花动力学中发挥着关键作用,即使存在像氨这样的替代源.
- 这些发现强调了在预测有害藻类繁殖形成和管理策略的模型中考虑N2固定的重要性.
相关概念视频
01:49The Nitrogen Cycle
59.7K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
59.7K
02:40The Eukaryotic Promoter Region
18.7K
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
18.7K
02:40The Eukaryotic Promoter Region
3.8K
3.8K
01:20Overview of Nitrogen Metabolism
11.1K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
11.1K
01:03Fixation and Sectioning
7.5K
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
7.5K
01:22Inorganic Nitrogen Assimilation
496
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
496