Researchers Database

SETO Mayumi

    Faculty Division of Natural Sciences Research Group of Environmental Sciences Assistant Professor
Last Updated :2021/10/23

researchmap

Degree

  • Doctor of Science, Kyushu University

Research Interests

  • 個体群動態 熱力学 数理生物学 微生物生態系 化学合成微生物 

Research Areas

  • Nanotechnology/Materials, Inorganic and coordination chemistry
  • Environmental science/Agricultural science, Environmental effects of chemicals
  • Environmental science/Agricultural science, Environmental effects of radiation
  • Environmental science/Agricultural science, Environmental policy and society
  • Environmental science/Agricultural science, Environmental impact assessment
  • Life sciences, Ecology and environmental science

Research Experience

  • Apr. 2009 Mar. - 2010, 独立行政法人国立環境研究所, NIES特別研究員, Japan
  • Apr. 2008 Mar. - 2009, Ehime University, 沿岸環境科学研究センター, グローバルCOE研究員, Japan

Education

  • - 2008, Kyushu University, 理学府, 地球惑星科学科, Japan
  • - 2008, Kyushu University, Graduate School of Sciences, Department of Earth and Plantary Sciences

Published Papers

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

    Mayumi Seto; Yoh Iwasa

    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., The Royal Society, 29 Jul. 2020, Proceedings of the Royal Society B: Biological Sciences, 287 (1931), 20200610 - 20200610, doi;url;url;rm:research_project_id

    Scientific journal

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

    Mayumi Seto; Yoh Iwasa

    Wiley, Dec. 2019, Ecology Letters, 22 (12), 1994, doi;url

  • Potential for Aerobic Methanotrophic Metabolism on Mars

    Seto Mayumi; Noguchi Katsuyuki; Van Cappellen Philippe

    07 Jun. 2019, ASTROBIOLOGY, doi;web_of_science

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

    Seto Mayumi; Iwasa Yoh

    21 Apr. 2019, JOURNAL OF THEORETICAL BIOLOGY, 467, 164 - 173, doi;web_of_science

  • Assessment of Instructions on Protection Against Food Contaminated with Radiocesium in Japan in 2011

    Mayumi Seto; Koichiro Uriu; Isao Kawaguchi; Hiroyuki Yokomizo

    The Japan Ministry of Health, Labour and Welfare (MHLW) has published instructions for radiological protection against food after the Fukushima Daiichi nuclear power plant accident in 2011. Following the instructions, the export and consumption of food items identified as being contaminated were restricted for a certain period. We assessed the validity of the imposed restriction periods for two representative vegetables (spinach and cabbage) grown in Fukushima Prefecture from two perspectives: effectiveness for reducing dietary dose and economic efficiency. To assess effectiveness, we estimated the restriction period required to maintain consumers’ dose below the guidance dose levels. To assess economic efficiency, we estimated the restriction period that maximizes the net benefit to taxpayers. All estimated restriction periods were shorter than the actual restriction periods imposed on spinach and cabbage from Fukushima in 2011, which indicates that the food restriction effectively maintained consumers’ dietary dose below the guidance dose level, but in an economically inefficient manner. We also evaluated the response of the restriction period to the sample size for each weekly food safety test and the instructions for when to remove the restriction. Stringent MHLW instructions seemed to sufficiently reduce consumers’ health risk even when the sample size for the weekly food safety test was small, but tended to increase the economic cost to taxpayers., Blackwell Publishing Inc., 01 Jun. 2018, Risk Analysis, 38 (6), 1154 - 1168, doi

    Scientific journal

  • 化学合成細菌と物質フロー:生物地球化学と生態学の交差点

    瀨戸 繭美

    2017, 地球化学, 51 (4), 185 - 193, doi

  • Perspectives for ecosystem management based on ecosystem resilience and ecological thresholds against multiple and stochastic disturbances

    Takehiro Sasaki; Takuya Furukawa; Yuichi Iwasaki; Mayumi Seto; Akira S. Mori

    Ecosystem resilience is the inherent ability to absorb various disturbances and reorganize while undergoing state changes to maintain critical functions. When ecosystem resilience is sufficiently degraded by disturbances, ecosystem is exposed at high risk of shifting from a desirable state to an undesirable state. Ecological thresholds represent the points where even small changes in environmental conditions associated with disturbances lead to switch between ecosystem states. There is a growing body of empirical evidence for such state transitions caused by anthropogenic disturbances in a variety of ecosystems. However, fewer studies addressed the interaction of anthropogenic and natural disturbances that often force an ecosystem to cross a threshold which an anthropogenic disturbance or a natural disturbance alone would not have achieved. This fact highlights how little is known about ecosystem dynamics under uncertainties around multiple and stochastic disturbances. Here, we present two perspectives for providing a predictive scientific basis to the management and conservation of ecosystems against multiple and stochastic disturbances. The first is management of predictable anthropogenic disturbances to maintain a sufficient level of biodiversity for ensuring ecosystem resilience (i.e., resilience-based management). Several biological diversity elements appear to confer ecosystem resilience, such as functional redundancy, response diversity, a dominant species, a foundation species, or a keystone species. The greatest research challenge is to identify key elements of biodiversity conferring ecosystem resilience for each context and to examine how we can manage and conserve them. The second is the identification of ecological thresholds along existing or experimental disturbance gradients. This will facilitate the development of indicators of proximity to thresholds as well as the understanding of threshold mechanisms. The implementation of forewarning indicators will be critical particularly when resilience-based management fails. The ability to detect an ecological threshold along disturbance gradients should therefore be essential to establish a backstop for preventing the threshold from being crossed. These perspectives can take us beyond simply invoking the precautionary principle of conserving biodiversity to a predictive science that informs practical solutions to cope with uncertainties and ecological surprises in a changing world. (C) 2015 Elsevier Ltd. All rights reserved., ELSEVIER SCIENCE BV, Oct. 2015, ECOLOGICAL INDICATORS, 57, 395 - 408, doi;web_of_science

  • Sample Size Allocation for Food Item Radiation Monitoring and Safety Inspection

    Mayumi Seto; Koichiro Uriu

    The objective of this study is to identify a procedure for determining sample size allocation for food radiation inspections of more than one food item to minimize the potential risk to consumers of internal radiation exposure. We consider a simplified case of food radiation monitoring and safety inspection in which a risk manager is required to monitor two food items, milk and spinach, in a contaminated area. Three protocols for food radiation monitoring with different sample size allocations were assessed by simulating random sampling and inspections of milk and spinach in a conceptual monitoring site. Distributions of I-131 and radiocesium concentrations were determined in reference to I-131 and radiocesium concentrations detected in Fukushima prefecture, Japan, for March and April 2011. The results of the simulations suggested that a protocol that allocates sample size to milk and spinach based on the estimation of I-131 and radiocesium concentrations using the apparent decay rate constants sequentially calculated from past monitoring data can most effectively minimize the potential risks of internal radiation exposure., WILEY-BLACKWELL, Mar. 2015, RISK ANALYSIS, 35 (3), 409 - 422, doi;web_of_science

    Scientific journal

  • The Gibbs Free Energy Threshold for the Invasion of a Microbial Population Under Kinetic Constraints

    Mayumi Seto

    Possible chemotrophic metabolism at a site of interest is controlled not only by the catabolic energy expressed as the Gibbs energy of reaction (Delta(r)G) but also by the kinetic constraints due to the availability of electron acceptors and donors. We introduced graphical and stochastic approaches for determining the Delta(r)G threshold required to support a microbial population with a specific catabolic strategy under kinetic constraints. Invasibility as an indicator of the present reproductive ability of a microbial population was evaluated by simultaneously calculating Delta(r)G for the catabolic reaction and the microbial catalytic rate. For example, the neutrophilic iron-oxidizing bacteria's invasibility was calculated by randomly choosing the Fe2+ and O-2 concentrations between 10(-8) and 10(-2) mol L-1, and pH between 4 and 8, to determine the Delta(r)G threshold for invasion. Parameters were estimated from batch experiments of neutrophilic iron-oxidizing bacteria reported in previous studies. Under the given conditions, the stochastic approach predicted that the neutrophilic iron-oxidizing bacteria can always invade a system in which the Delta(r)G for Fe oxidation is below -90 kJ mol Fe-1, can occasionally invade if Delta(r)G is between -45 and -90 kJ mol Fe-1, and can never invade if Delta(r)G is above -45 kJ mol Fe-1. The Delta(r)G threshold for invasion is sifted by the growth yield coefficient, the loss rate of cells, the maximum cell-specific Fe oxidation rate constant, and the temperature. The Delta(r)G threshold for invasion may be unable to rigorously predict the stable dominance of microbial metabolism, but can provide a rough indication for the possible microbial metabolism under current conditions., TAYLOR & FRANCIS INC, 2014, GEOMICROBIOLOGY JOURNAL, 31 (8), 645 - 653, doi;web_of_science

    Scientific journal

  • The effect of zinc on aquatic microbial ecosystems and the degradation of dissolved organic matter

    Mayumi Seto; Shigeki Wada; Satoru Suzuki

    We developed a simple aquatic microbial ecosystem model in order to examine potential effects of zinc on microorganisms and the related degradation of dissolved organic matter (DOM). The model is a combination of both a traditional food chain and a microbial loop. The traditional food chain is mainly composed of phytoplankton and zooplankton, whilst the microbial loop is composed of DOM, bacteria and bacterivorous protozoa. We incorporated the suppressive effect of zinc on the bacterial uptake of DOM and assessed the steady state responses of the model for various zinc concentrations. The analytical and numerical results of the model implied that either zooplankton or bacterivorous protozoa might be the most vulnerable group to excessive zinc load than bacteria, depending on the grazing preference of zooplankton between phytoplankton and bacterivorous protozoa. The sensitivity analyses supported that the microbial loop solely is more sensitive to zinc than the coupled system combining both the traditional food chain and the microbial loop. (C) 2012 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD, Jan. 2013, CHEMOSPHERE, 90 (3), 1091 - 1102, doi;web_of_science

    Scientific journal

  • Regime shift and robustness of organism-created environments: A model for microbial ecosystems

    Mayumi Seto; Yoh Iwasa

    Organism-environment interactions are different from organism-resource interactions in two respects: (1) resources can only be consumed by organisms whereas environmental conditions can be increased or decreased depending on the species; (2) high resource conditions generally stimulate the growth of organisms, whereas extreme environmental conditions are not necessarily favored because each species usually has an optimum range for growth. To investigate the properties of an organism-environment feedback system, we analyze a model for microbial ecosystems in which a single microorganism species can modify the environmental pH. We demonstrate that the equilibrium level of the environmental pH can be partially regulated at a relatively constant value even if the pH in the influx to the ecosystem changes over a wide range. For species that acidify the medium, the equilibrium pH is somewhat lower than the pH optimal for the species. The pH-stabilizing effect of microorganisms is stronger if their growth is self-limited by the environmental pH. When the influx becomes sufficiently alkaline, the population of the organism suddenly disappears and the environmental pH changes abruptly. The system shows bi-stability and hysteresis and therefore differs from a standard resource competition model composed of a single species that consumes resources. (C) 2010 Elsevier Ltd. All rights reserved., ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, Jan. 2011, JOURNAL OF THEORETICAL BIOLOGY, 269 (1), 297 - 306, doi;pubmed;web_of_science

    Scientific journal

  • Mathematical explanation for the non-linear hydrophobicity-dependent bioconcentration processes of persistent organic pollutants in phytoplankton

    Mayumi Seto; Itsuki C. Handoh

    Phytoplankton play a vital role in determining the fate and transport of persistent organic pollutants (POPS) in aquatic ecosystems. Lipids in phytoplankton cells can accumulate POPS, and equilibrium partitioning of the chemicals between lipids and water can be deduced from the octanol/water partition coefficient (K(ow)). However, there is much uncertainty in the response of the bioconcentration factor (BCF) to K(ow). While distinct level-off and bell-shaped responses of BCF to Kow have been confirmed by laboratory experiments, a mathematical basis for the non-linear processes has been lacking. Using two differential equation models (Water-Phytoplankton and Water-Phytoplankton-Dissolved Organic Carbon) we here examine previously reported non-linearity between BCF and K(ow). Our modelling studies suggest that a level-off response of the true BCF (BCF estimated at equilibrium) to Kow could be attributed to the presence of dissolved organic carbon (DOC). The alternative bell-shaped response appears to be a consequence of the apparent BCF (BCF estimated at non-equilibrium) for which the slow uptake rate of chemical compounds of relatively large molecular mass by phytoplankton is responsible. (C) 2009 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2009, CHEMOSPHERE, 77 (5), 679 - 686, doi;web_of_science

    Scientific journal

  • Teasing out the non-linearity in the POPs-phytoplankton bioconcentration processes

    Seto, M; Handoh, I.C

    2009, Interdisciplinary Studies on Environmental Chemistry Vol. 2 Environmental Research in Asia for Establishing a Scientist’s Network, 11 - 19

  • Chemical condition for the appearance of a negative Ce anomaly in stream waters and groundwaters

    Mayumi Seto; Tasuku Akagi

    Nine publications showing REE data in groundwaters and river water were examined to understand the general condition of terrestrial water where a negative Ce anomaly develops. It was found that the negative Ce anomaly only appeared when Fe, Mn and dissolved organic carbon (DOC) concentrations were low (Fe and Mn < 5 x 10(-5) mol/L and DOC < 10 mg/L). Assuming that Ce3+ and Fe2+ concentrations were limited by the formation of cerianite and ferrihydrite, respective redox potential (Eh) was calculated from each of Ce3+ and Fe2+ concentrations. For data sets displaying Ce anomalies, the calculated Ehs (cEhs) showed a 1:1 relationship between Ce and Fe. This relationship indicates that the absolute concentration of Ce in natural water may be thermodynamically determined in situ by Eh and pH when concentrations of Fe, Mn and DOC are poor., GEOCHEMICAL SOC JAPAN, 2008, GEOCHEMICAL JOURNAL, 42 (4), 371 - 380, cinii_articles;doi;web_of_science

    Scientific journal

  • Coexistence introducing regulation of environmental conditions

    Mayumi Seto; Tasuku Akag

    Interactions between environmental conditions and environment-affecting species have not been investigated extensively. In this study, the population dynamics of species yielding regulative feedback between temperature (a representative of environmental condition) and species with a temperature-altering trait was examined. We considered a simple closed model that described the population of two species (at least one of them had a temperature-altering trait) competing for one resource. The long-term outcomes of the competition and changes of temperature were explored against increasing background temperature. As a result of simulations, the regulation of temperature was accompanied by the coexistence of two species, which was contrary to the 'Gause's exclusion principle'. The steady-state analysis showed that (i) the temperature-altering trait allowed species to coexist and (ii) the coexistence of species with the trait could introduce the regulation of temperature. A 'trade-off' in their ability to utilize a resource plays a key role in this coexistence and homeostasis of temperature. This may imply that actual environmental conditions can be automatically stabilized by resource competition among species in natural ecosystems. (c) 2007 Elsevier Ltd. All rights reserved., ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, Sep. 2007, JOURNAL OF THEORETICAL BIOLOGY, 248 (2), 267 - 274, doi;web_of_science

    Scientific journal

  • Daisyworld inhabited with daisies incorporating a seed size/number trade-off: the mechanism of negative feedback on selection from a standpoint of the competition theory

    M Seto; T Akagi

    We reexamined a Daisyworld model from the traditional view of competition theory. Unlike the original model, white and black daisies in our model incorporate a seeding/germination trade-off against bare ground area without assuming the local temperature reward. As a result, the planetary temperature is automatically regulated by two species if the following conditions are met: (i) the species react equally to an environmental condition, but one can alter the environmental condition in the opposite direction to the other. (ii) that one of the two cannot have both a higher maximal growth rate and lower half-saturation constant (K) than those of the other. In other words, a pair of phenotypes incorporates a trade-off between quality and number of seeds. We found that the homeostatic regulation can also be reconciled with the adaptive evolution of optimal temperature. The results of simulation imply that biotic environmental feedback can also be maintained when the emergence of polymorphisms (black and white daisies) is closely linked to such a trade-off. (c) 2005 Elsevier Ltd. All rights reserved., ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, May 2005, JOURNAL OF THEORETICAL BIOLOGY, 234 (2), 167 - 172, doi;web_of_science

    Scientific journal

  • Influence of snow on iron release from soil

    M Seto; T Akagi

    The concentration of Fe in stream water and groundwater was measured monthly during a whole year. The study fields were Ozenuma lake and Senjougahara peatland, which snow covers for more than 5 months in winter. Iron concentration in water increased during snow-covered and thaw seasons with the synchronized decrease in Eh and pH for both stream water and groundwater. In snow-covered seasons, it is hypothesized that supply of melt water and/or coverage with ice layers during this period could cause the development of an anaerobic zone in underlying soil. This study suggests that change in the amount of snowfall or in the length of snow season may influence the geochemical cycle of iron., GEOCHEMICAL SOC JAPAN, 2005, GEOCHEMICAL JOURNAL, 39 (2), 173 - 183, cinii_articles;doi;web_of_science

    Scientific journal

  • 酸化還元電位の理解のための簡単な実験装置系の考案

    瀬戸 繭美; 赤木 右

    2003, 化学と教育, 51 (12), 786 - 787, doi

  • How Thermodynamics Illuminates Population Interactions in Microbial Communities

    Mayumi Seto; Yoh Iwasa

    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., Frontiers Media SA, 30 Nov. 2020, Frontiers in Ecology and Evolution, 8, doi;url;scopus;scopus_citedby;rm:research_project_id

    Scientific journal

MISC

  • 「生物地球化学」特集に寄せて

    瀨戸 繭美; 瀬戸 繭美; 板井 啓明

    2017, 地球化学, 51 (4), 157 - 158, doi

  • The effect of zinc on marine microbial food web and biodegradation of dissolved organic matter

    Seto Mayumi; Wada Shigeki

    亜鉛は生物の必須元素である一方で過剰摂取によって毒性を発現することが知られている。現在水生生物の個体群レベルでの保全に留意した亜鉛の環境基準として、海水域では生物A類型で0.02mg L-1、 生物特A類型で0.01mg L-1が設定されているが、沿岸域ではこれを上回る亜鉛濃度がしばしば観測されており、水圏生態系の環境リスクが懸念されている。更に近年、亜鉛の添加によって海水中のバクテリアによる溶存有機炭素(DOM)の利用が阻害され、DOMの分解速度が低下することが室内実験によって明らかにされた。これは海水への亜鉛の負荷が海洋微生物食物網と海水中のDOM動態の両方に影響を及ぼしうることを示唆する。 本研究では、 (1)DOM・バクテリア・ナノ繊毛虫から成る微生物ループ、並びに(2) (1)に植物プランクトン・動物プランクトンを加えた微生物食物網の2つのモデルを構築し、亜鉛の負荷が海洋の微生物生態系並びにDOM分解に及ぼす影響をモデルの数理解析とシミュレーションを通して検証した(図1)。本モデルでは対象空間を均一な系であると仮定し、連立常微分方程式によって微生物間の相互作用やDOMフローのプロセスについて記述した。(1), (2)の2つのモデルの時間動態並びに定常状態を解析・数値計算し、亜鉛の負荷量に対する海水中の全炭素量、DOM量、各生物の炭素量の割合の応答について調べた。 亜鉛による微生物ループへの影響を検証した結果、亜鉛の負荷量が大きくなるにつれてバクテリアの捕食者であるナノ鞭毛虫の減少が予測された。また、その減少率はDOMの少ない貧栄養の環境下において高くなる傾向が示された。亜鉛濃度がある閾値を上回った場合には、ナノ繊毛虫が存続を維持することができなくなり、微生物ループが崩壊する可能性が示唆された。植物プランクトン・動物プランクトンを加えた微生物食物網の場合、植物プランクトンの生産量が高くDOC供給が多い場合には亜鉛によるナノ鞭毛虫の減少を緩和する傾向が示されたが、一方で動物プランクトンによるナノ繊毛虫への捕食圧が高い場合には再びナノ繊毛虫の存続が維持できなくなることが予測された。また、ナノ繊毛虫が減少するにつれて海水中の全炭素量に占めるDOMの割合が上昇することが予測された。, GEOCHEMICAL SOCIETY OF JAPAN, 2011, Abstracts of Annual Meeting of the Geochemical Society of Japan, 58 (0), 275 - 275, doi;cinii_articles

  • Seasonal change in Eh-pH condition of natural water and consistency between Fe and Ce concentrations

    M Seto; T Akagi

    PERGAMON-ELSEVIER SCIENCE LTD, Sep. 2003, GEOCHIMICA ET COSMOCHIMICA ACTA, 67 (18), A423 - A423, web_of_science

    Summary international conference

  • 高等学校生物教育における直接体験型生態学教育の重要性

    矢野幸洋; 瀬戸 繭美

    2018, 教育システム研究, 14, 99 - 102

  • 積雪が形成する還元的環境における土壌有機物の分解挙動

    瀬戸 繭美; 赤木 右

    2003, 化学と工業, 56 (7), 817

  • 植物プランクトンにおける残留性有機汚染物質の濃縮過程の数理モデル

    瀬戸繭美; 半藤逸樹

    2010, 日本地球化学会年会講演要旨集, 57th, j_global

Books etc

  • 遺伝子・多様性・循環の科学 : 生態学の領域融合へ

    門脇, 浩明; 立木, 佑弥 (, Range: 呼吸の多様性が駆動する元素循環)

    京都大学学術出版会, Feb. 2019, v, 432p, 図版 [8] p, cinii_books (ISBN: 9784814001903)

Presentations

  • Application of bioenergetics in Astrobiology and Ecology

    SETO Mayumi

    Ecohydrology Research Symposium, Waterloo, Canada, Dec. 2019

  • Catabolic mutualistic interactions can lead ecosystem expansion

    SETO Mayumi

    24th International Symposium on Environmental Biogeochemistry, Potsdam, Germany, Sep. 2019

  • エネルギー獲得を巡る微生物相互作用: ニッチ構築と物質フローの拡大

    瀬戸 繭美

    第29回日本数理生物学会, Sep. 2019

  • 化学合成の代謝エネルギー獲得量に律速された微生物個体群動態についての新しい洞察

    瀬戸 繭美

    日本生態学会第66回全国大会, Mar. 2019

  • Assessment of instructions on protection against food contaminated with radiocesium in Japan in 2011

    環境科学国際ワークショップ, 2018

  • Assessment of instructions on protection against food contaminated with radiocesium in Japan in 2011

    The Society for Risk Analysis, Asia Conference 2018, 2018

  • 呼吸反応に着目した微生物群集の多様性と生態系機能の関係

    日本生態学会第65回全国大会, 2018

  • Assessment of instructions on protection against food contaminated with radiocesium in Japan in 2011

    環境科学国際ワークショップ, 2018

  • Assessment of instructions on protection against food contaminated with radiocesium in Japan in 2011

    The Society for Risk Analysis, Asia Conference 2018, 2018

  • 微生物呼吸が駆動する元素循環: 呼吸を介して読み解く栄養共生と物質フロー

    2017年度 数学・物理学・情報科学シンポジウム, 2017

  • 個体群動態モデルを用いた環境変動に対する生物応答の予測

    第5回JAMBIOフォーラム, 2016

  • 化学合成細菌の群集間相互作用と共存のメカニズム

    日本生態学会第62回全国大会, 2015

  • Metabolic energy-based habitability of methanotrophic life on Mars

    2015 AGC-CGU Joint Assembly, 2015

  • Chemotrophic bacteria and material cycles: How they increase fluxes?

    2015 Joint Meeting of JSMB and CJK Colloquium on Mathematical Biology, 2015

  • 生物は本当に物質流を増やすのか?: 化学合成細菌群集を例として

    進化群集生態学シンポジウム2015, 2015

  • Metabolic energy-based habitability of methanotrophic life on Mars

    2015 AGC-CGU Joint Assembly, 2015

  • Chemotrophic bacteria and material cycles: How they increase fluxes?

    2015 Joint Meeting of JSMB and CJK Colloquium on Mathematical Biology, 2015

  • Invasibility of chemotrophic microorganisms

    JSMB/SMB 2014 Osaka, 2014

  • The effect of foraging of honeybees on distributions of two competing annual flowers

    JSMB/SMB 2014 Osaka, 2014

  • Chemotrophic bacterial roles in biogeochemical material cycles

    The symposium on recent developments in evolutionary community ecology, 2014

  • ボックスモデル計算による化学合成細菌群集の地球化学的ニッチの検証

    日本地球化学会年会2014年度, 2014

  • Ecological and evolutionary perspectives of syntrophic communities

    The 2014 ISEB short course, 2014

  • Invasibility of chemotrophic microorganisms

    JSMB/SMB 2014 Osaka, 2014

  • The effect of foraging of honeybees on distributions of two competing annual flowers

    JSMB/SMB 2014 Osaka, 2014

  • Chemotrophic bacterial roles in biogeochemical material cycles

    The symposium on recent developments in evolutionary community ecology, 2014

  • Ecological and evolutionary perspectives of syntrophic communities

    The 2014 ISEB short course, 2014

  • The validity of safety measures for food contaminated with radioactive materials

    One Health Summit 2012, 2012

  • Possible effects of ocean acidification on a phytoplankton-pH feedback

    China-Japan-Korea International Conference on Mathematical Biology, 2012

  • Probabilistic risk assessment for food contamination

    2012 International Mathematica Symposium, 2012

  • 生物は環境の「ノイズ」でしかないのか?ー地球化学的問題に対する数理生物学的アプローチ

    日本地球化学会2012年会, 2012

  • 数理モデルで探る微生物生態系の法則性

    日本地球化学若手シンポジウム2012, 2012

  • Potential biological pH buffering effect and regime shift

    Third International Symposium on the Ocean in a High CO2 world, 2012

  • Mathematical model for the dynamics of chemolithotrophic bacteria

    International Society for Environmental Biogeochemistry Short Course, 2012

  • The validity of safety measures for food contaminated with radioactive materials

    One Health Summit 2012, 2012

  • Possible effects of ocean acidification on a phytoplankton-pH feedback

    China-Japan-Korea International Conference on Mathematical Biology, 2012

  • Probabilistic risk assessment for food contamination

    2012 International Mathematica Symposium, 2012

  • Potential biological pH buffering effect and regime shift

    Third International Symposium on the Ocean in a High CO2 world, 2012

  • Mathematical model for the dynamics of chemolithotrophic bacteria

    International Society for Environmental Biogeochemistry Short Course, 2012

  • 水圏で閾値な話:数理モデルによる生態学的閾値の導出

    日本生態学会第58回全国大会, 2011

  • 食品に対する放射性物質検査と出荷制限解除条件の妥当性

    第34回生命数理セミナー, 2011

  • 食品に対する放射性物質検査と出荷制限解除条件の妥当性

    第21回数理生物学会大会, 2011

  • 亜鉛負荷による海洋微生物食物網並びに溶存有機炭素分解に対する影響予測

    地球化学会年会2011, 2011

  • 亜鉛負荷による海洋微生物食物網並びに溶存有機炭素分解に対する影響予測

    下田臨海研究センター合同セミナー, 2011

  • The validity of safety measures for food contaminated with radioactive materials

    JSMB Annual Meeting 2011, 2011

  • The effect of zinc on aquatic microbial ecosystems and the degradation of dissolved organic matter

    Annual Meeting of GSJ 2011, 2011

  • The effect of zinc on aquatic microbial ecosystems and the degradation of dissolved organic matter

    2011

  • ため池管理のための数理モデル: 水生植物がアオコの発生に及ぼす影響

    日本生態学会第57回全国大会, 2010

  • 植物プランクトンにおける残留性有機汚染物質の濃縮過程の数理モデル

    2010年度日本地球化学会年会, 2010

  • 被食-捕食者系における微生物-pH相互作用 Microorganism-pH interactions in a prey-predator system

    第20回日本数理生物学会札幌大会, 2010

  • 数理モデルを用いた水圏生態系における生態学的閾値の導出 -アオコ発生と微生物ループ崩壊の予防を目標として-

    第2回水環境セミナー, 2010

  • Teasing out the non-linearity in the POPs-phytoplankton bioconcentration processes

    Advanced Course and Conference on the Mathematical Biology: Modelling and Differential Equations, 2009

  • Non-linearities in bioconcentration of persistent organic pollutants in phytoplankton

    第19回日本数理生物学会, 2009

  • 淡水生態系における生物の環境構築による生態系の安定化とレジームシフト

    第36回生態リスクCOE公開講演会, 2009

  • Teasing out the non-linearity in the POPs-phytoplankton bioconcentration processes

    Advanced Course and Conference on the Mathematical Biology: Modelling and Differential Equations, 2009

  • A mathematical model for biotic regulation of physicochemical conditions

    第55回日本生態学会, 2008

  • Does a life-environment feedback increase the probability of coexistence?

    第18回日本数理生物学会, 2008

  • The effect of biological activity on environmental stability

    第18回日本数理生物学会, 2008

  • Puzzling out the non-linearity in the POPs-phytoplankton bioconcentration processes

    Interdisciplinary Symposium on Environmental Sciences: To Establish an Asian Network of Environmental Researchers, 2008

  • Puzzling out the non-linearity in the POPs-phytoplankton bioconcentration processes

    Interdisciplinary Symposium on Environmental Sciences: To Establish an Asian Network of Environmental Researchers, 2008

  • 陸域窒素サイクルにおける草食動物の役割

    日本地球惑星科学連合2007年大会, 2007

  • Coexistence introducing regulation of environmental conditions

    Joint Annual Meetings of The Society for Mathematical Biology and The Japanese Society for Mathematical Biology - 2007, 2007

  • 地下水と渓流水におけるCe anomalyの出現に関する考察

    日本地球惑星科学連合2007年大会, 2007

  • The enhancement of nitrification in the presence of herbivores

    ECEM’07 The 6th European Conference on Ecological Modelling, 2007

  • Coexistence introducing regulation of environmental conditions

    Joint Annual Meetings of The Society for Mathematical Biology and The Japanese Society for Mathematical Biology - 2007, 2007

  • The enhancement of nitrification in the presence of herbivores

    ECEM’07 The 6th European Conference on Ecological Modelling, 2007

  • The mechanism of negative feedback on selection for environment-altering species from a standpoint of the competition theory

    International Workshop on Ecological Informatics of Chaos and Complex Systems, 2006

  • 栄養塩獲得競争から生じる環境-生物-栄養塩間自己調節フィードバック

    日本地球惑星科学連合2006年大会, 2006

  • Stabilization of environmental conditions introduced by environmental- altering traits of competing species

    Japanese-Korean Joint Meeting for Mathematical Biology, 2006

  • The mechanism of negative feedback on selection for environment-altering species from a standpoint of the competition theory

    International Workshop on Ecological Informatics of Chaos and Complex Systems, 2006

  • Stabilization of environmental conditions introduced by environmental- altering traits of competing species

    Japanese-Korean Joint Meeting for Mathematical Biology, 2006

  • 種まき競争デイジーワールドモデル

    地球惑星科学関連学会2005年合同大会, 2005

  • 資源獲得競争から生じる生物-環境間フィードバック調節モデル(種まき競争デイジーワールドモデル)

    第7回日本進化学会, 2005

  • 資源獲得競争から生じる生物-環境間フィードバック調節モデル

    日本数理生物学会第15回大会, 2005

  • 資源獲得競争を巡る種間競走から生じる環境調節フィードバックモデル

    2005年度日本地球化学会第52回年会, 2005

  • 地球表層における鉄循環への雪による影響

    地球惑星科学関連学会2003年合同大会, 2003

  • Seasonal change in Eh & pH condition of natural water and consistency between Fe and Ce concentrations

    Goldschmidt Conference, 2003

  • Seasonal change in Eh & pH condition of natural water and consistency between Fe and Ce concentrations

    Goldschmidt Conference, 2003

  • 融雪期における表面水および地下水の酸化還元電位, pHの変化

    日本陸水学会第67回大会, 2002

  • エネルギーで読み解く 微生物相互作用と微生物代謝の進化

    瀬戸繭美

    生態研セミナー, 21 Feb. 2020

  • Microbial growth, interactions, and evolution at the energetic edge : Theoretical perspectives based on thermodynamics and population dynamics

    Mayumi Seto

    ELSI Seminar, 18 Feb. 2020

  • 微生物代謝ネットワークと生態系の共進化 : 化学エネルギー観点からの進化的制約とは?

    瀬戸繭美

    第16回生物数学の理論とその応用〜生命現象の定量的理解に向けて〜, 28 Jan. 2020

  • 酸化還元反応と生命 - 微生物代謝の進化と生態系の発展 -

    瀬戸繭美

    ソフトマターの未来材料シンポジウム, 10 Jan. 2020

  • Mutualistic interspecific interactions through energy production reactions

    瀬戸繭美

    日本生態学会第68回全国大会, 19 Mar. 2021

  • 光非依存生産者の種間相互作用と生物地球化学サイクルの数理モデル

    瀬戸繭美

    2020年度日本数理生物学会年会, 22 Sep. 2020

  • 高校生ワークショップ「高校生のための数理生物学」/生物増殖のモデリング・シミュレーションを体験してみよう

    瀬戸繭美

    2020年度日本数理生物学会年会, 21 Sep. 2020

  • 高校生ワークショップ「高校生のための数理生物学」/「微生物 + エネルギー」を「理科 + 数理モデル」で理解する

    瀬戸繭美

    2020年度日本数理生物学会年会, 21 Sep. 2020

  • Exploring microbial community from the perspective of metabolic energy

    Mayumi Seto

    京都大学生態学研究センター共同利用ワークショップ 微生物を軸とした群集構造研究の統合とさらなる展開, 24 Sep. 2021, rm:research_project_id

  • Competition and cooperation in microbial nitrification metabolism

    Mayumi Seto

    The 31st Annual Meeting of Japanese Society for Mathematical Biology (JSMB2021), 15 Sep. 2021, 13 Sep. 2021, 15 Sep. 2021, rm:research_project_id

  • Application of bioenergetics to microbial modeling

    Mayumi Seto

    iTHEMS Biology Seminar, 29 Jul. 2021, rm:research_project_id

  • 化学合成微生物群集における代謝の協力

    瀬戸繭美

    ダーウィンセミナー, 17 May 2021, rm:research_project_id

Association Memberships

  • 日本数理生物学会

  • 日本生態学会

  • 日本地球化学会

Media Coverage

  • 奈良女大 環境トークバトルゲーム, 毎日新聞奈良版, 17 Sep. 2018, 大和のオススメ!


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