小さな氷河期以来,亜熱帯北太平洋の窒素固定が増加しています
Owen A Sherwood1, Thomas P Guilderson2, Fabian C Batista3
11] Ocean Sciences Department, University of California, Santa Cruz, California 95064, USA [2] Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 80309, USA.
Nature
|December 17, 2013
まとめ
北太平洋亜熱帯圏 (NPSG) の原産物は,窒素を固定する原核生物への移行により増加しています. 気候変動に関連したこの傾向は,過去100年にわたる窒素固定の有意な増加を示しています.
科学分野:
- 海洋生物ジオケミストリー
- パレオセアノグラフィー
- 海洋学 海洋学とは
背景:
- 北太平洋亜熱帯渦巻 (NPSG) は,深海の炭素と栄養素の輸出に極めて重要です.
- NPSGの一次生産の最近の増加は,表面栄養素供給の減少にもかかわらず発生しました.
- プランクトンのシフトがユカリオットから窒素を固定するプロカリオットに,このパラドックスを説明するために仮定されています.
関連する概念動画
01:22Inorganic Nitrogen Assimilation
928
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...
928
01:50Global Climate Change
24.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.4K
01:27Microbes and Climate Change
91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91
01:28Carbon-dioxide Fixation
873
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
873
01:06Primary Production
20.4K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
20.4K
01:20Overview of Nitrogen Metabolism
8.6K
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...
8.6K