Latest Update：2025/11/20 09:49:13

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

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Research Result (Publication)

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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
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)

View all

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)
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)

View all

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)

View all

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 : -

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TSUCHIYA Kenji

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