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相关概念视频

Primary Production01:06

Primary Production

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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.
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The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

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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...
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Eukaryotic Evolution01:24

Eukaryotic Evolution

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Bioremediation00:46

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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The Calvin Benson Cycle01:46

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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Photosystem II01:22

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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相关实验视频

Updated: May 23, 2025

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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幼核植物浮游生物在热带和亚热带海洋中因CO2升高而导致初级产量减少.

Rongbo Dai1, Zuozhu Wen1, Haizheng Hong1

  • 1State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361102, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|March 10, 2025
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概括

由于二氧化碳 (CO2) 的增加,海洋酸化降低了海洋浮游生物的生产力,特别是在营养缺乏地区. 小型真核浮游植物受影响最大,影响了全球初级生产预测.

关键词:
单核植物浮游生物是真核植物.有高的二氧化碳排放.低生产率 低生产率 低生产率热带和亚热带海洋的海洋

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科学领域:

  • 海洋生物学 海洋生物学
  • 海洋学 海洋学 海洋学
  • 气候变化科学 气候变化科学

背景情况:

  • 人为二氧化碳 (CO2) 排放正在推动海洋酸化.
  • 海洋酸化对海洋浮游生物生产力的影响仍然不确定.
  • 植物浮游生物是海洋生态系统中至关重要的初级生产者.

研究的目的:

  • 研究海洋酸化对植物浮游生物群落组成和生产力的影响.
  • 评估植物浮游生物对西北太平洋地区二氧化碳水平升高的反应的区域差异.
  • 预测在脆弱海洋地区对初级生产的潜在全球影响.

主要方法:

  • 实地研究在西北太平洋进行,包括北太平洋亚热带旋转和南中国海北部.
  • 在环境和酸性条件下测量了浮游植物群体的组成和初级生产率.
  • 数据被推断出来,以预测对寡头性海洋区域的全球影响.

主要成果:

  • 海洋酸化导致北太平洋亚热带旋转和南中国海北部的初级产量持续减少.
  • Prokaryotic 植物浮游生物对高CO2的反应呈现中性到积极的反应.
  • 小型真核浮游植物 (<20微米),限,主要负责观察到的社区初级生产的下降.

结论:

  • 海洋酸化对特定亚热带和热带地区的初级生产产生负面影响.
  • 小型真核浮游植物特别容易受到海洋酸化的影响.
  • 全球初级产量在低叶绿素-a,寡质型区域可能会减少约5 Pg Cy-1由于酸化和分层.