TSUCHIYA Kenji

Researcher Name: TSUCHIYA Kenji

Div (Section) name/title: Regional Environment Conservation Division(Lake and River Section)/Researcher

Research Subject: Material cycling in aquatic ecosystems

Degree(s): Doctor of Philosophy in Engineering

Professional Qualification(s): Biology,Biochemistry,Science of Fisheries

Environmental Speciality Field: environmental dynamics,biogeochemistry,water environment

Research Subject

Fiscal Year: 2025
- 27234 : Research on Advancement of Climate Change Impact Assessment Methodology
- 27247 : Regional Environment Conservation Domain: Foresight and Advanced Basic Research
- 27477 : Policy-oriented research on conservation and restoration of water environment of Lake Biwa
- 27484 : Assessing the function of benthic animals for water and sediment quality and estimating the risks caused by their decline
- 27486 : Research on water and lake-bottom environment for soundness evaluation of Lake Biwa
- 27487 : Long-term monitoring for the regional freshwater quality
Fiscal Year: 2024
- 26849 : Research on Advancement of Climate Change Impact Assessment Methodology
- 26864 : Regional Environment Conservation Domain: Foresight and Advanced Basic Research
- 27020 : Long-term monitoring for the regional freshwater quality
- 27022 : Policy-oriented research on conservation and restoration of water environment of Lake Biwa
- 27025 : Research on water and lake-bottom environment for soundness evaluation of Lake Biwa
- 27092 : Assessing the function of benthic animals for water and sediment quality and estimating the risks caused by their decline
Fiscal Year: 2023
- 26436 : Research on Advancement of Climate Change Impact Assessment Methodology
- 26453 : Regional Environment Conservation Domain: Foresight and Advanced Basic Research
- 26633 : Policy-oriented research on conservation and restoration of water environment of Lake Biwa
- 26634 : Research on water and lake-bottom environment for soundness evaluation of Lake Biwa
- 26657 : Assessing the function of benthic animals for water and sediment quality and estimating the risks caused by their decline
- 26658 : Long-term monitoring for the regional freshwater quality
Fiscal Year: 2022
- 26010 : Regional Environment Conservation Domain: Foresight and Advanced Basic Research
- 26257 : Water level operation for ecosystem regime management of lakes
Fiscal Year: 2021
- 25713 : Regional Environment Conservation Domain: Foresight and Advanced Basic Research
- 25774 : Water level operation for ecosystem regime management of lakes
Fiscal Year: 2020
- 25183 : Bacterial production in river ecosystems
Fiscal Year: 2017
- 24115 : Relationship between molecular size distribution of seawater dissolved organic matter and bacterial decomposition
- 24116 : Importance of food chain initiated by methane-derived carbon in a lake ecosystem

Research Result (Publication)

all
Original Paper

Original Paper
Spatial variation of multifunctionality among abandoned rice paddies and irrigation ponds: potential roles of hydrological and environmental factors

Presenter : Matsuzaki S., Kohzu A., Watanabe M., Nakanishi K., Tsuchiya K., Kondo N., Sueyoshi M.
Title : , Restoration Ecology, 33(8):e70161 (2026)
Original Paper
Carrier-resolved metagenomics suggests the dual "filter–hub" function of a large freshwater lake toward incoming antibiotic resistance genes

Presenter : Shan S., Shimotori K., Tsuchiya K., Sueyoshi M., Matsuda T., Shimizu Y.
Title : , Science of The Total Environment, 1010(181145): (2026)
Original Paper
Effects of winter heatwaves on carbon dioxide and methane emissions from shallow lakes: A temperature-controlled mesocosm study

Presenter : Tang H., Zhao X., Deng J., Qiu B., Yang Y., Nakano S., Matsuzaki S., Shinohara R., Kohzu A., Tsuchiya K.
Title : , Journal of Hydrology, 665(134704): (2026)
Original Paper
Enhanced impacts of fipronil under a warming scenario on functional traits of paddy invertebrate communities

Presenter : Ishiwaka N, Hiraiwa M.K., Nishiguchi T., Hashimoto K., Tsuchiya K., Sánchez-Bayo F., Kadoya T., Hayasaka D.
Title : , Environmental Pollution, 392:127622 (2026)
Original Paper
Indirect effects of insecticide exposure under warming conditions considering predator-prey interactions in a freshwater ecosystem

Presenter : Ishiwaka N., Hiraiwa M.K., Hashimoto K., Tsuchiya K., Doi K., Yoshida K., Kadoya T., Hayasaka D.
Title : , Limnology (2026)
Original Paper
Depth-resolved carbon dioxide and methane concentrations in 522 lakes, ponds, and reservoirs worldwide

Presenter : Rabaey J.S., Lewis A.S.L., Attermeyer K., Aurich P., Bansal S., Bartosiewicz M., Bertolet B.L., Bussmann I., Cadieux S.B., Calamita E., Capelli C., Carey C.C., Cillero C., Clayer F., D'Ambrosio S.L., Davidson T.A., Deemer B.R., Denfeld B.A., Eckert W., Esposito C., Ford P., Gorsky A., Griffiths N.A., Grossart H.-P.F., Hamilton D.P., Holgerson M.A., Huser B.J., Iwata T., Jansen J., Jones S.E., Juutinen S., Kortelainen P., Koschorreck M., Kragh T., Laas A., Larmola T., Laubli S., Laurion I., Lehmann M.F., Liu L., Martikainen P.J., Matousu A., McCord S.A., Montes-Perez J.J., Nizzoli D., Ordonez C., Peacock M., Pilla R.M., Preskienis V., Pu J., Riis T., Saarela T., Santoso A.B., Schubert C.J., Sepulveda-Jauregui A., Sherman B.S., So J.S., Stenehjem K.J., Strock K.E.D., Tsuchiya K., Wendt-Potthoff K., Weyhenmeyer G.A., Znachor P., Zopfi J.
Title : , Scientific Data, 13:483 (2026)
Original Paper
Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Hydrology: Regional Studies, 58:102233 (2025)
Original Paper
Identification of wastewater-specific peak on EEM and their application for detecting the effluent in the discharged area

Presenter : Komatsu K., Onodera T., Tsuchiya K., Kohzu A., Syutsubo K.
Title : , Water Research, 275(123213): (2025)
Original Paper
Estimating internal dissolved methane loading in rivers using a mass balance approach

Presenter : Tsuchiya K., Miura S., Kohzu A.
Title : , PeerJ, 13(e20238): (2025)
Original Paper
Vertical eDNA distribution of cold-water fishes in response to environmental variables in stratified lake

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Title : , Ecology and Evolution, 14(3):e11091-e11091 (2024)
Original Paper
Virus-prokaryote infection pairs associated with prokaryotic production in a freshwater lake

Presenter : Shen S., Tominaga K., Tsuchiya K., Matsuda T., Yoshida T., Shimizu Y.
Title : , mSystems, 9(2): (2024)
Original Paper
Relationship between fish traits and the methane-derived carbon contribution to fish in a shallow lake

Presenter : Tsuchiya K., Matsuzaki S., Kohzu A.
Title : , Freshwater Biology, 69(10):1468-1478 (2024)
Original Paper
Water-level drawdowns can improve surface water quality and alleviate bottom hypoxia in shallow, eutrophic water bodies

Presenter : Matsuzaki S., Kohzu A., Tsuchiya K., Shinohara R., Nakagawa M., Fukumori K., Yamaguchi H., Kondo N., Kadoya T.
Title : , Freshwater Biology, 68(2):229-244 (2023)
Original Paper
Ingestion rate estimated from food concentration and predatory role of copepod nauplii in the microbial food web of temperate embayment waters

Presenter : Sugai Y., Natori N., Tsuchiya K., Nakagawa M., Honda M.C., Shimode S., Toda T.
Title : , Journal of Plankton Research (2023)
Original Paper
Horizontal variability and regulation of bacterial production in Lake Biwa, Japan.

Presenter : Tsuchiya K., Tomioka N., Komatsu K., Sano T., Kohzu A., Imai A., Hayakawa K., Nagata T., Okamoto T., Ohara T.
Title : , Limnology, 23:231-243 (2022)
Original Paper
Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan

Presenter : Sogawa S., Tsuchiya K., Nagai S., Shimode S., Kuwahara V.S.
Title : , Metabarcoding and Metagenomics, 6:41-58 (2022)
Original Paper
The composition of organic phosphorus in a river during the springtime irrigation period

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Hydrology: Regional Studies, 44:101238 (2022)
Original Paper
Does increased springtime solar radiation also increase primary production?

Presenter : Shinohara R., Matsuzaki S., Nakagawa M., Tsuchiya K., Kohzu A.
Title : , Journal of Plankton Research, 44(4):497-507 (2022)
Original Paper
Differences in regulation of planktonic and epilithic biofilm bacterial production in the middle reaches of a temperate river

Presenter : Tsuchiya K., Kohzu A., Kuwahara V.S., Matsuzaki S., Denda M., Hirabayashi K.
Title : , Aquatic Microbial Ecology, 87:47-60 (2021)
Original Paper
Warming of water temperature in spring and nutrient release from sediment in a shallow eutrophic lake

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Water and Climate Change, 12(7):3187 (2021)
Original Paper
Variability of benthic methane-derived carbon along seasonal, biological, and sedimentary gradients in a polymictic lake

Presenter : Tsuchiya K., Komatsu K., Shinohara R., Imai A., Matsuzaki S., Ueno R., Kuwahara V.S., Kohzu A.
Title : , Limnology and Oceanography (2020)
Original Paper
Novel method for measuring aquatic bacterial productivity using D10-leucine based on protein synthesis rate

Presenter : Tsuchiya K., Sano T., Tomioka N., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Kuwahara V. S., Kohzu A.
Title : , Aquatic Microbial Ecology, 85:121-129 (2020)

Spatial variation of multifunctionality among abandoned rice paddies and irrigation ponds: potential roles of hydrological and environmental factors

Presenter : Matsuzaki S., Kohzu A., Watanabe M., Nakanishi K., Tsuchiya K., Kondo N., Sueyoshi M.
Title : , Restoration Ecology, 33(8):e70161 (2026)
Carrier-resolved metagenomics suggests the dual "filter–hub" function of a large freshwater lake toward incoming antibiotic resistance genes

Presenter : Shan S., Shimotori K., Tsuchiya K., Sueyoshi M., Matsuda T., Shimizu Y.
Title : , Science of The Total Environment, 1010(181145): (2026)
Effects of winter heatwaves on carbon dioxide and methane emissions from shallow lakes: A temperature-controlled mesocosm study

Presenter : Tang H., Zhao X., Deng J., Qiu B., Yang Y., Nakano S., Matsuzaki S., Shinohara R., Kohzu A., Tsuchiya K.
Title : , Journal of Hydrology, 665(134704): (2026)
Enhanced impacts of fipronil under a warming scenario on functional traits of paddy invertebrate communities

Presenter : Ishiwaka N, Hiraiwa M.K., Nishiguchi T., Hashimoto K., Tsuchiya K., Sánchez-Bayo F., Kadoya T., Hayasaka D.
Title : , Environmental Pollution, 392:127622 (2026)
Indirect effects of insecticide exposure under warming conditions considering predator-prey interactions in a freshwater ecosystem

Presenter : Ishiwaka N., Hiraiwa M.K., Hashimoto K., Tsuchiya K., Doi K., Yoshida K., Kadoya T., Hayasaka D.
Title : , Limnology (2026)
Depth-resolved carbon dioxide and methane concentrations in 522 lakes, ponds, and reservoirs worldwide

Presenter : Rabaey J.S., Lewis A.S.L., Attermeyer K., Aurich P., Bansal S., Bartosiewicz M., Bertolet B.L., Bussmann I., Cadieux S.B., Calamita E., Capelli C., Carey C.C., Cillero C., Clayer F., D'Ambrosio S.L., Davidson T.A., Deemer B.R., Denfeld B.A., Eckert W., Esposito C., Ford P., Gorsky A., Griffiths N.A., Grossart H.-P.F., Hamilton D.P., Holgerson M.A., Huser B.J., Iwata T., Jansen J., Jones S.E., Juutinen S., Kortelainen P., Koschorreck M., Kragh T., Laas A., Larmola T., Laubli S., Laurion I., Lehmann M.F., Liu L., Martikainen P.J., Matousu A., McCord S.A., Montes-Perez J.J., Nizzoli D., Ordonez C., Peacock M., Pilla R.M., Preskienis V., Pu J., Riis T., Saarela T., Santoso A.B., Schubert C.J., Sepulveda-Jauregui A., Sherman B.S., So J.S., Stenehjem K.J., Strock K.E.D., Tsuchiya K., Wendt-Potthoff K., Weyhenmeyer G.A., Znachor P., Zopfi J.
Title : , Scientific Data, 13:483 (2026)
Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Hydrology: Regional Studies, 58:102233 (2025)
Identification of wastewater-specific peak on EEM and their application for detecting the effluent in the discharged area

Presenter : Komatsu K., Onodera T., Tsuchiya K., Kohzu A., Syutsubo K.
Title : , Water Research, 275(123213): (2025)
Estimating internal dissolved methane loading in rivers using a mass balance approach

Presenter : Tsuchiya K., Miura S., Kohzu A.
Title : , PeerJ, 13(e20238): (2025)
Vertical eDNA distribution of cold-water fishes in response to environmental variables in stratified lake

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Title : , Ecology and Evolution, 14(3):e11091-e11091 (2024)
Virus-prokaryote infection pairs associated with prokaryotic production in a freshwater lake

Presenter : Shen S., Tominaga K., Tsuchiya K., Matsuda T., Yoshida T., Shimizu Y.
Title : , mSystems, 9(2): (2024)
Relationship between fish traits and the methane-derived carbon contribution to fish in a shallow lake

Presenter : Tsuchiya K., Matsuzaki S., Kohzu A.
Title : , Freshwater Biology, 69(10):1468-1478 (2024)
Water-level drawdowns can improve surface water quality and alleviate bottom hypoxia in shallow, eutrophic water bodies

Presenter : Matsuzaki S., Kohzu A., Tsuchiya K., Shinohara R., Nakagawa M., Fukumori K., Yamaguchi H., Kondo N., Kadoya T.
Title : , Freshwater Biology, 68(2):229-244 (2023)
Ingestion rate estimated from food concentration and predatory role of copepod nauplii in the microbial food web of temperate embayment waters

Presenter : Sugai Y., Natori N., Tsuchiya K., Nakagawa M., Honda M.C., Shimode S., Toda T.
Title : , Journal of Plankton Research (2023)
Horizontal variability and regulation of bacterial production in Lake Biwa, Japan.

Presenter : Tsuchiya K., Tomioka N., Komatsu K., Sano T., Kohzu A., Imai A., Hayakawa K., Nagata T., Okamoto T., Ohara T.
Title : , Limnology, 23:231-243 (2022)
Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan

Presenter : Sogawa S., Tsuchiya K., Nagai S., Shimode S., Kuwahara V.S.
Title : , Metabarcoding and Metagenomics, 6:41-58 (2022)
The composition of organic phosphorus in a river during the springtime irrigation period

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Hydrology: Regional Studies, 44:101238 (2022)
Does increased springtime solar radiation also increase primary production?

Presenter : Shinohara R., Matsuzaki S., Nakagawa M., Tsuchiya K., Kohzu A.
Title : , Journal of Plankton Research, 44(4):497-507 (2022)
Differences in regulation of planktonic and epilithic biofilm bacterial production in the middle reaches of a temperate river

Presenter : Tsuchiya K., Kohzu A., Kuwahara V.S., Matsuzaki S., Denda M., Hirabayashi K.
Title : , Aquatic Microbial Ecology, 87:47-60 (2021)
Warming of water temperature in spring and nutrient release from sediment in a shallow eutrophic lake

Presenter : Shinohara R., Tsuchiya K., Kohzu A.
Title : , Journal of Water and Climate Change, 12(7):3187 (2021)
Variability of benthic methane-derived carbon along seasonal, biological, and sedimentary gradients in a polymictic lake

Presenter : Tsuchiya K., Komatsu K., Shinohara R., Imai A., Matsuzaki S., Ueno R., Kuwahara V.S., Kohzu A.
Title : , Limnology and Oceanography (2020)
Novel method for measuring aquatic bacterial productivity using D10-leucine based on protein synthesis rate

Presenter : Tsuchiya K., Sano T., Tomioka N., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Kuwahara V. S., Kohzu A.
Title : , Aquatic Microbial Ecology, 85:121-129 (2020)

Research Result (Presentation)

all
Research Presentation

Research Presentation
Bacterial production of free-living and particle-attached bacteria in a freshwater lake and inflowing rivers

Presenter : Shen S., Tsuchiya K., Shimotori K., Yamaguchi Y. T., Sueyoshi M.
Name of Society : The 19th International Symposium on River and Lake Environment (ISRLE 19) (2024)
Name of Proceedings : Abstract, 39
Research Presentation
Estimation of methane loading from riverbed

Presenter : Tsuchiya K., Kohzu A., Miura S.
Name of Society : The 19th International Symposium on River and Lake Environment (ISRLE 19) (2024)
Name of Proceedings : Abstract, 95
Research Presentation
Vertical distribution of two salmonid species in response to water temperature and hypoxia

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Name of Society : The 2023 conference of the Ecological Society of Australia (2023)
Name of Proceedings : -
Research Presentation
Estimation of internal methane loading in river

Presenter : Tsuchiya K., Kohzu A., Miura S.
Name of Society : Freshwater Sciences 2023 (2023)
Name of Proceedings : Abstracts
Research Presentation
Differences in vertical distribution of two salmonid species: the impacts of warm water temperature and hypoxia in a stratified lake

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Name of Society : The eDNA Society International Meeting 2023 (2023)
Name of Proceedings : -
Research Presentation
Substantial decrease in bacterial production over the past three decades in the north basin of Lake Biwa, Japan

Presenter : Tsuchiya K., Tomioka N., Sano T., Kohzu A., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Hirose Y.
Name of Society : 35th Congress of the International Society of Limnology (SIL2021) (2021)
Name of Proceedings : Abstracts, (210058)

Bacterial production of free-living and particle-attached bacteria in a freshwater lake and inflowing rivers

Presenter : Shen S., Tsuchiya K., Shimotori K., Yamaguchi Y. T., Sueyoshi M.
Name of Society : The 19th International Symposium on River and Lake Environment (ISRLE 19) (2024)
Name of Proceedings : Abstract, 39
Estimation of internal methane loading in river

Presenter : Tsuchiya K., Kohzu A., Miura S.
Name of Society : Freshwater Sciences 2023 (2023)
Name of Proceedings : Abstracts
Substantial decrease in bacterial production over the past three decades in the north basin of Lake Biwa, Japan

Presenter : Tsuchiya K., Tomioka N., Sano T., Kohzu A., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Hirose Y.
Name of Society : 35th Congress of the International Society of Limnology (SIL2021) (2021)
Name of Proceedings : Abstracts, (210058)
Estimation of methane loading from riverbed

Presenter : Tsuchiya K., Kohzu A., Miura S.
Name of Society : The 19th International Symposium on River and Lake Environment (ISRLE 19) (2024)
Name of Proceedings : Abstract, 95
Vertical distribution of two salmonid species in response to water temperature and hypoxia

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Name of Society : The 2023 conference of the Ecological Society of Australia (2023)
Name of Proceedings : -
Differences in vertical distribution of two salmonid species: the impacts of warm water temperature and hypoxia in a stratified lake

Presenter : Fukumori K., Kondo N., Kohzu A., Tsuchiya K., Ito H., Kadoya T.
Name of Society : The eDNA Society International Meeting 2023 (2023)
Name of Proceedings : -

TSUCHIYA Kenji

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