Population dynamics of chemotrophs in anaerobic conditions where the metabolic energy acquisition per redox reaction is limited

Seto, Mayumi; Iwasa, Yoh

doi:10.1016/j.jtbi.2019.01.037

Cited by 10 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…either the maximum catalytic rate per unit of biomass of species i, r i , increases, or K y and K y , the Michaelis-Menten constants for y and z, decrease). In our previous paper (Seto & Iwasa 2019), we demonstrated that the steady-state microbial population density when the ARP effect has a significant influence decreases as the microbe's resource-utilising ability increases. This is because a microbial population with a very high resource-utilising ability depletes resources, reducing the energy available from the reaction and therefore its own growth rate, which eventually results in a decrease in the population size.…”

Section: Arp Affects Microbial Evolution and Ecosystem Developmentmentioning

confidence: 89%

“…They do this using energy obtained from a set of chemical reactions that convert a resource to a by‐product. The amount of energy obtained per reaction increases with the abundance of the resource and decreases with the abundance of the by‐product, the ARP effect (Seto & Iwasa ). The present study examined the interspecific mutualistic interaction resulting from this effect, its implications for population dynamics and its importance for expanding realised niches, boosting material flow through the ecosystem, and generating mutualistic interactions among the species in the ecosystem.…”

Section: Discussionmentioning

confidence: 99%

“…−∆ G increases with the abundance of catabolic resources and decreases as the by‐products become more abundant. This effect, which we named the ‘abundant resource premium’ (ARP) (Seto & Iwasa ), predicts the mutualism between groups 1 and 2 in Fig. .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The fitness of chemotrophs increases when their catabolic by‐products are consumed by other species

Seto

Iwasa

2019

Ecology Letters

Self Cite

View full text Add to dashboard Cite

Chemotrophic microorganisms synthesise biomass by utilising energy obtained from a set of chemical reactions that convert resources to by‐products, forming catabolic interactions. The amount of energy obtained per catabolic reaction decreases with the abundance of the by‐product named as the ‘abundant resource premium’. Consider two species, Species 1 and 2, Species 1 obtains energy from a reaction that converts resource A to by‐product B. Species 2 then utilises B as its resource, extracting energy from a reaction that converts B to C. Thus, the presence of Species 2 reduces the abundance of B, which improves the fitness of Species 1 by increasing the energy acquisition per reaction of A to B. We discuss the population dynamic implication of this effect and its importance in expanding a realised niche, boosting material flow through the ecosystem and providing mutualistic interactions among species linked by the material flow. Introducing thermodynamics into population ecology could offer us fundamental ecological insights into understanding the ecology of chemotrophic microorganisms dominating the subsurface realm.

show abstract

Section: Arp Affects Microbial Evolution and Ecosystem Developmentmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The fitness of chemotrophs increases when their catabolic by‐products are consumed by other species

Seto

Iwasa

2019

Ecology Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…We consider the model targeting microorganisms, such as microbes inhabiting the deep subsurface, the growth of which is limited by the energy that they can obtain from their catabolic reactions [17]. The maximum energy production rate when type i catalyses reaction i is calculated as the microbial catalytic rate multiplied by the negative of the Gibbs energy change of reaction i.…”

Section: ð2:2cþmentioning

confidence: 99%

“…Symbol {X} represents the activity of X, calculated as {X} = a x [X], where a x is the activity coefficient of X and [X] is its molar concentration. The second term on the right-hand side of equation (1.1) is called the 'abundant resource premium' (ARP) [17,18]. This quantity indicates the change in the available energy, which is increased by the abundance of catabolic resources and decreased by the abundance of by-products.…”

Section: Introductionmentioning

confidence: 99%

Microbial material cycling, energetic constraints and ecosystem expansion in subsurface ecosystems

Seto

Iwasa

2020

Proc. R. Soc. B.

Self Cite

View full text Add to dashboard Cite

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 A e ), where reaction 1 converts A to A e and reaction 2 converts A e 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.

show abstract

On how the power supply shapes microbial survival

Diego

Hannisdal

Dahle

2021

Mathematical Biosciences

View full text Add to dashboard Cite

Population dynamics of chemotrophs in anaerobic conditions where the metabolic energy acquisition per redox reaction is limited

Cited by 10 publications

References 36 publications

The fitness of chemotrophs increases when their catabolic by‐products are consumed by other species

The fitness of chemotrophs increases when their catabolic by‐products are consumed by other species

Microbial material cycling, energetic constraints and ecosystem expansion in subsurface ecosystems

On how the power supply shapes microbial survival

Contact Info

Product

Resources

About