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连接性和营养丰富性影响水生元生态系统的生产力和稳定性

Egor Katkov¹, Michelle Gros^1,2, Vincent Fugère^2,3

¹Department of Biology, McGill University, Montreal, Canada.

Proceedings. Biological sciences

|November 11, 2025

概括

人类的影响,如水域连接的改变和营养丰富,可能会损害淡水元生态系统. 这项研究表明,连接性增加会使营养丰富效应恶化,使动态均化.

科学领域:

生态生态学生态生态学
环境科学环境科学
水生生态学水生生态学

背景情况:

人类活动通过改变连接和营养丰富对水生生态系统产生重大影响.
关于这些压力因素对元生态系统稳定的综合影响的实证研究有限.

研究的目的:

研究水域连接和营养丰富对元生态系统稳定的相互作用影响.
了解这些因素如何影响连接的池系统中的植物浮游生物和动物浮游生物的动态.

主要方法:

使用两个连接的池 (上游和下游) 进行了一个中宇宙实验.
应用了模拟连接的可变水流和五个级别的营养丰富 (和).
一个分数因子设计在14.5周内监测了13种治疗组合.

主要成果:

连接扩大了营养丰富条件下的植物浮游生物质.
连接性和营养丰富性都独立地增加了植物浮游生物的同步性和空间均性.
介质连接促进了动物浮游生物的生物质和多样性,但这种效应被营养丰富所抵消.

结论:

生态系统连接性增加可能会加剧淡水元生态系统中营养丰富的负面影响.
连接性和营养丰富性使超生态系统内的时间人口动态均质化.
这些发现凸显了整个流域的潜在级联效应.

关键词:

连接性的连接性.肥胖症是什么肥胖症是什么肥胖症是什么淡水淡水水的情况.这是一个mesocosm.这是一个超生态系统.营养丰富的营养丰富植物浮游生物植物.动物浮游生物 (zooplankton) 是一种动物浮游生物.

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Primary Production

Primary Production

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.

What is an Ecosystem?

What is an Ecosystem?

Ecological Disturbance

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.

Metabolism of Chemolithotrophs

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.

Trophic Efficiency

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

The Soil Ecosystem

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components: