在海洋旋转的边界上的营养共同限制
Thomas J Browning1, Eric P Achterberg1, Insa Rapp1
1Marine Biogeochemistry Division, GEOMAR Helmholtz Centre for Ocean Research, Kiel 24148, Germany.
Nature
|November 2, 2017
概括
海洋的初级生产通常受到和铁的限制. 实验表明,添加这两种营养素可以显著促进浮游生物的生长,而其他营养素也发挥着作用.
科学领域:
- 海洋生物学 海洋生物学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 营养素的限制极大地控制了海洋初级生产,影响了海洋食物网和碳循环.
- 低温的亚热带旋转代表了极端的生产力转型,但这些地区的营养限制尚不清楚.
研究的目的:
- 为了调查南大西洋旋转的东部边界的营养限制.
- 为了确定,铁和其他微量营养素对浮游生物生长的影响.
主要方法:
- 在南大西洋旋转中进行了全因子营养修改实验.
- 测量了叶绿素a度和浮游植物群体组成.
主要成果:
- 单独添加或铁并没有显著刺激浮游植物生长.
- 和铁的同时添加增加了多达40倍的叶绿素a度,促进了藻的生长并减少了多样性.
- 在减轻铁限制后,或维生素B12进一步增强了叶绿素a的产量,增加了三倍.
结论:
- 和铁的共同限制在海洋地区很普遍.
- 多种营养素的限制,包括等微量营养素,是普遍存在的,并影响植物浮游生物群落的结构和多样性.
相关概念视频
01:06Primary Production
24.6K
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.
24.6K
01:38Limits to Natural Selection
33.5K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
33.5K
00:57Population Growth
26.6K
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
26.6K
02:27Limiting Reactant
67.0K
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
67.0K
01:28Magnetostatic Boundary Conditions
1.4K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.4K
01:25Boundary Conditions for Current Density
1.2K
Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
1.2K