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Microbial material cycling, energetic constraints and ecosystem expansion in subsurface ecosystems
Proceedings of the Royal Society B: Biological Sciences ( IF 3.8 ) Pub Date : 2020-07-29 , DOI: 10.1098/rspb.2020.0610
Mayumi Seto 1 , Yoh Iwasa 2
Affiliation  

To harvest energy from chemical reactions, microbes engage in diverse catabolic interactions that drive material cycles in the environment. Here, we consider a simple mathematical model for cycling reactions between alternative forms of an element (A and Ae), where reaction 1 converts A to Ae and reaction 2 converts Ae to A. There are two types of microbes: type 1 microbes harness reaction 1, and type 2 microbes harness reaction 2. Each type receives its own catabolic resources from the other type and provides the other type with the by-products as the catabolic resources. Analyses of the model show that each type increases its steady-state abundance in the presence of the other type. The flux of material flow becomes faster in the presence of microbes. By coupling two catabolic reactions, types 1 and 2 can also expand their realized niches through the abundant resource premium, the effect of relative quantities of products and reactants on the available chemical energy, which is especially important for microbes under strong energetic limitations. The plausibility of mutually beneficial interactions is controlled by the available chemical energy (Gibbs energy) of the system. We conclude that mutualistic catabolic interactions can be an important factor that enables microbes in subsurface ecosystems to increase ecosystem productivity and expand the ecosystem.

中文翻译:

地下生态系统中的微生物物质循环、能量约束和生态系统扩张

为了从化学反应中获取能量,微生物会进行多种分解代谢相互作用,从而推动环境中的物质循环。在这里,我们考虑一个简单的数学模型,用于在元素的替代形式(A 和 Ae)之间循环反应,其中反应 1 将 A 转化为 Ae,反应 2 将 Ae 转化为 A。有两种类型的微生物: 类型 1 微生物利用反应1,和类型 2 微生物利用反应 2. 每种类型从另一种类型接收其自身的分解代谢资源,并为另一种类型提供副产物作为分解代谢资源。模型分析表明,在另一种类型存在的情况下,每种类型都会增加其稳态丰度。在微生物存在的情况下,材料流动的流量变得更快。通过耦合两个分解代谢反应,类型 1 和类型 2 还可以通过丰富的资源溢价、产品和反应物的相对数量对可用化学能的影响来扩展其实现的生态位,这对于在强能量限制下的微生物尤其重要。互利相互作用的合理性由系统的可用化学能(吉布斯能)控制。我们得出结论,共生分解代谢相互作用可能是使地下生态系统中的微生物能够提高生态系统生产力和扩大生态系统的一个重要因素。互利相互作用的合理性由系统的可用化学能(吉布斯能)控制。我们得出结论,共生分解代谢相互作用可能是使地下生态系统中的微生物能够提高生态系统生产力和扩大生态系统的一个重要因素。互利相互作用的合理性由系统的可用化学能(吉布斯能)控制。我们得出结论,共生分解代谢相互作用可能是使地下生态系统中的微生物能够提高生态系统生产力和扩大生态系统的一个重要因素。
更新日期:2020-07-29
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