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

Seto, Mayumi; Iwasa, Yoh

doi:10.1111/ele.13397

Cited by 10 publications

(15 citation statements)

References 70 publications

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“…Some of the results in this paper are similar to those in our previous model in which type 2 uses the catabolic by-product of type 1 but type 1 does not use the by-product of type 2 [ 18 ] ( figure 6 a ). To clarify, we call the form of interaction between two catabolic reactions ‘one-way interaction’, as illustrated in figure 6 a , where one reaction is upstream of the other.…”

Section: Discussionsupporting

confidence: 82%

“…These two interactions are frequently observed in biogeochemical cycles. From our previous report [18] and this paper, we can conclude that type 2 in the one-way interaction can increase the steady-state biomass of type 1 and expand the realized niche of type 1 only when the ARP is considered and sufficiently large, and type 2 in the recycle interaction can increase the steady-state biomass of type 1 and expand its realized niche regardless of the presence of the ARP. When the ARP is important, type 2 can further expand the realized niche of type 1.…”

Section: Discussion (A) One-way Interaction and Recycling Interactionsupporting

confidence: 57%

“… Type and example of mutualistic catabolic interactions. (a) One-way interaction studied in Seto & Iwasa [ 18 ]. ( b ) Recycling interaction studied in this paper.…”

Section: Discussionmentioning

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%

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

Seto

Iwasa

2020

Proc. R. Soc. B.

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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.

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Section: Discussionsupporting

confidence: 82%

Section: Discussion (A) One-way Interaction and Recycling Interactionsupporting

confidence: 57%

“… Type and example of mutualistic catabolic interactions. (a) One-way interaction studied in Seto & Iwasa [ 18 ]. ( b ) Recycling interaction studied in this paper.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Seto

Iwasa

2020

Proc. R. Soc. B.

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“…Mutualistic catabolic interactions. (A) One-way interactions(Seto and Iwasa, 2019b). (B) Recycling interactions(Seto and Iwasa, 2020).…”

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confidence: 99%

How Thermodynamics Illuminates Population Interactions in Microbial Communities

Seto

Iwasa

2020

Front. Ecol. Evol.

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In traditional population models of microbial ecology, there are two central players: producers and consumers (including decomposers that depend on organic carbon). Producers support surface ecosystems by generating adenosine triphosphate (ATP) from sunlight, part of which is used to build new biomass from carbon dioxide. In contrast, the productivity of subsurface ecosystems with a limited supply of sunlight must rely on bacteria and archaea that are able generate ATP solely from chemical or electric energy to fix inorganic carbon. These “light-independent producers” are frequently not included in traditional food webs, even though they are ubiquitous in nature and interact with one another through the utilization of the by-products of others. In this review, we introduce theoretical approaches based on population dynamics that incorporate thermodynamics to highlight characteristic interactions in the microbial community of subsurface ecosystems, which may link community structures and ecosystem expansion under conditions of a limited supply of sunlight. In comparison with light-dependent producers, which compete with one another for light, the use of Gibbs free energy (chemical energy) can lead cooperative interactions among light-independent producers through the effects of the relative quantities of products and reactants on the available chemical energy, which is termed abundant resource premium. The development of a population theory that incorporates thermodynamics offers fundamental ecological insights into subsurface microbial ecosystems, which may be applied to fields of study such as environmental science/engineering, astrobiology, or the microbial ecosystems of the early earth.

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From competition to facilitation and mutualism: a general theory of the niche

Koffel

Daufresne

Klausmeier

2021

Ecological Monographs

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Niche Theory is a central framework in ecology based on the recognition that most interactions between organisms are indirect, mediated by the biotic and abiotic dynamical environment these organisms live in. Despite its potential generality, the theory still mostly focuses on how resource–consumer dynamics mediate competition in ecological communities. However, it is being increasingly recognized that positive interactions between organisms also play an important role in driving the structure and functioning of ecological communities, from plants to microbes. In this paper, we present a unified theory of the niche that applies to both positive and negative interactions between organisms, mediated by one or two environmental factors. We show that classical concepts such as niche differences and fundamental and realized niches can naturally be expanded to facilitative and mutualistic interactions. In addition, we introduce and formalize new general niche concepts that appear exclusively in the presence of positive interactions: (1) the Allee niche, a region of environmental conditions for which a species can persist but not invade from low densities and (2) niche facilitation, when the presence of a species expands the set of environmental conditions under which a second species can invade and/or persist. To show the broad applicability of this theory, we illustrate these concepts using a diverse set of theoretical examples, from bacteria feeding on an inhibiting substrate, to nitrogen‐fixing plants and the indirect mutualism between a plant and a carnivore species. In sum, our work shows how Niche Theory provides a natural framework for positive interactions in ecology, bringing a unified perspective and new conceptual tools to study ecological systems where these positive interactions occur.

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

Cited by 10 publications

References 70 publications

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

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

How Thermodynamics Illuminates Population Interactions in Microbial Communities

From competition to facilitation and mutualism: a general theory of the niche

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