Ryoji NAKAZATOAssociate Professor

■Researcher basic information

Organization

  • Global and Local Environment Co-creation Institute
  • College of Science Department of Sciences Biological Sciences
  • Graduate School of Science and Engineering（Master's Program） Major in Science
  • Graduate School of Science and Engineerin（Doctoral Program） Major in Complex Systems Science
  • Faculty of Basic Natural Science Domain of Biological Sciences

Research Areas

  • Life sciences, Ecology and environmental science, Limnological Ecology
  • Environmental science/Agricultural science, Environmental impact assessment, Biological Environmental Science
  • Environmental science/Agricultural science, Environmental effects of radiation, Risk sciences of radiation and chemicals
  • Environmental science/Agricultural science, Environmental effects of chemicals, Risk sciences of radiation and chemicals

Research Keyword

  • セシウム
  • 渓流魚（イワナ・ヤマメ）
  • 帰還困難区域
  • 底生動物（ベントス）
  • 環境放射能
  • ユスリカ
  • 霞ヶ浦

SDGs related to your own research

Degree

  • 1998年02月　博士（理学）（東京都立大学）
  • 1992年03月　修士（理学）（信州大学）

Career

  • Apr. 2024 - Present, 茨城大学 学術研究院 基礎自然科学野, 准教授
  • Apr. 2020 - Mar. 2024, 茨城大学地球・地域環境共創機構, 准教授
  • Apr. 2007 - Mar. 2020, 茨城大学広域水圏環境科学教育研究センター, 准教授
  • Apr. 2005 - Mar. 2007, 茨城大学広域水圏環境科学教育研究センター, 講師
  • Apr. 1998 - Mar. 2005, 茨城大学広域水圏環境科学教育研究センター, 助手
  • Apr. 1996 - Mar. 1998, 山形大学理学部物質生命化学科, 助手
  • Apr. 1992 - Mar. 1996, Tokyo Metropolitan University
  • Apr. 1990 - Mar. 1992, 信州大学大学院理学研究科生物学専攻修士課程
  • Apr. 1986 - Mar. 1990, 信州大学理学部生物科学科

Member History

  • Apr. 2015 - Present, 客員研究員, 茨城県霞ヶ浦環境科学センター
  • Apr. 2007 - Mar. 2022, スーパーサイエンスハイスクール運営指導委員, 清真学園高等学校
  • Apr. 2018, 委員, 茨城県環境審議会霞ヶ浦専門部会

■Research activity information

Award

  • Aug. 2024, 令和6年度 河川基金助成事業 研究者・研究機関部門 国土交通大臣賞, 帰還困難区域の山地渓流生態系における放射性セシウム移行メカニズムに関する研究, 公益財団法人 河川財団
    中里亮治
  • 1999, 日本陸水学会賞（吉村賞）
    中里亮治

Paper

  • Radioactive cesium concentrations of chironomid larvae inhabiting mountain streams in the difficult-to-return zone in Fukushima Prefecture　　　　　　　　　　　　　　　
    Ryusei Jin; Yuma Ogawa; Shota Aoi; Jin’ichi Karube; Hitone Suzuki; Tadaaki Sato; Ryoji Nakazato
    Proceedings of the 25th Workshop on Environmental Radioactivity, Dec. 2024, [Reviewed]
  • Changes in 137Cs concentration in mountain stream fish inhabiting forest streams in difficult-to-return zone from 2015 to 2023
    Ryoji Nakazato; Yuma Ogawa; Shota Aoi; Ryusei Jin; Chiaki Ohkuma; Rikuto Kondo; Kohsei Yamamoto; Mika Tarui; Ken’ ichi Kato; Tadaaki Sato; Hitone Suzuki; Hiroshi Iwase; Yukihiko Satou; Jin’ichi Karube, Lead
    Proceedings of the 25th Workshop on Environmental Radioactivity, Dec. 2024
  • 帰還困難区域の渓流・森林環境中に生息する無脊椎動物の137Cs濃度について　　　　　　　　　　　　　　　
    小川侑真; 近藤陸人; 山本昂正; 苅部甚一; 加藤健一; 佐藤忠明; 鈴木仁根; 中里亮治, Last
    Proceedings of the 24th Workshop on Environmental Radioactivity, Nov. 2023, [Reviewed]
  • Radiocesium concentrations of macro invertebrates inhabiting mountain streams in the difficult-to-return area in Fukushima Prefecture
    小川侑真; 近藤陸人; 樽井美香; 苅部甚一; 加藤健一; 佐藤忠明; 鈴木仁根; 中里亮治, Last, 高エネルギー加速器研究機構（KEK）
    Proceedings of the 23rd Workshop on Environmental Radioactivity, Nov. 2022, [Reviewed]
  • Development of a live fish measuring method of 137Cs concentration for masu salmon and white-spotted char inhabiting mountain streams in the difficult-to-return area in Fukushima Prefecture using a NaI (Tl) scintillation detector.　　　　　　　　　　　　　　　
    近藤陸人; 樽井美香; 斉藤智幸; 岩瀬 広; 加藤健一; 佐藤忠明; 鈴木仁根; 中里亮治, Last, 高エネルギー加速器研究機構（KEK）
    Proceedings of the 22nd Workshop on Environmental Radioactivity, Dec. 2021, [Reviewed]
  • Methods for quantitative sampling of epiphytic microinvertebrates in lake vegetation
    M. Sakuma; T. Hanazato; R. Nakazato; H. Haga, Springer Science and Business Media LLC
    Limnology, 01 Aug. 2002
  • P-261 Characteristics of sediments in lake Kitaura
    Naya Tomonori; Okada Makoto; Nakazato Ryouji; Nirei Hisashi; Amano Kazuo, The Geological Society of Japan
    Annual Meeting of the Geological Society of Japan, 2000
  • Field Trial of a Trapping Control Method for Chironomid Midges, Propsilocerus akamusi(Diptera) Using Attraction of High-Intensity Lights.
    平林公男; 中里亮治; 沖野外輝夫
    環動昆, 1998, [Reviewed]
  • Effect of larval density on temporal variation in Life Cycle Patterns of Chironomus plumosus(L. )(Diptera : Chironomidae) in the profundal Zone of eutrophic Lake Suwa during 1982-1995.
    Ryoji Nakazato; Kimio Hirabayashi, Lead, The temporal variation in emergence patterns of Chironomus plumosus (L.) was studied during 1982-1995 (except in 1987 and 1988) in the central part of eutrophic Lake Suwa. The number of emergence periods in any one year occurred two (March - May and August - September) or three times (March - May, June - July and August - September). The appearance of the emergence period of June - July appears to be dependent on the growth of larval populations during May - June from adults that had emerged in March -April. In this population, larvae that had not developed to a mature size emerged in the next emergence period. The relationships between the emergence periods and mud temperature, dissolved oxygen concentration, chlorophyll-a concentration in 6 m water depth or sedimentation rate at 5 m depth were not clear, whereas the emergence periods were closely related to larval densities during May - June. Thus, the years which exhibited a high larval density of more than 2,000 ind m-2 had no emergence period of June - July in almost all cases. These results suggest that competition due to the increased density of the C. plumosus larval population slowed their growth and, consequently, the emergence period of June - July did not appear., Japanese Society of Limnology
    Japanese Journal of Limnology, 1998, [Reviewed]
  • Abundance and seasonal trend of dominant chironomid adults and horizontal distribution of larvae in eutophic Lake Suwa, Japan
    R. Nakazato; K. Hirabayashi; T. Okino, Lead, The abundance and seasonal trend of chironomid emergence and the horizontal distribution of larvae were studied in Lake Suwa from April 1990 to December 1991. A total of 18 species of chironomid adults were captured with a light trap set up on the eastern shore of the lake, and 11 species with bottom-type emergence traps at 2.5 m water depth. Abundant species in the light trap were Chironomus plumosus, Einfeldia dissidens, Propsilocerus akamusi, Procladius choreus, and Glyptotendipes tokunagai. In particular, the former three species constituted 86% of all adults captured with the light trap. E. dissidens was first reported from this lake in the present study. C. plumosus had three emergence periods in 1990, but only two in 1991. The emergence of P. akamusi took place during October to November in both years. The emergence periods of E. dissidens, P. choreus and G. tokunagai occurred during May to October in both years without a marked emergence peak. In a grid survey of 68 points located at intervals of ca. 250~500 m, C. plumosus larvae were mainly distributed in the profundal zone. P. akamusi larvae had the widest distribution with high densities at all stations. E. dissidens was more abundant in the littoral zone, showing significant negative correlations with water depth and loss on ignition., Japanese Society of Limnology
    The Japanese Journal of Limnology, 1998, [Reviewed]
  • Examination of Direct Counting Methods for Bacteria in Lake Sediment by Epifluorescence Microscopy.
    NAKAZATO Ryoji; WATANABE Yasunori, Lead, The Japanese Society of Limnology
    Japanese Journal of Limnology (Rikusuigaku Zasshi), 1994, [Reviewed]
  • Autotrophic picoplankton in southern Lake Baikal : Abundance, growth and grazing mortality during summer.
    T NAGATA; K TAKAI; K KAWANOBE; DS KIM; R NAKAZATO; N GUSELNIKOVA; N BONDARENKO; O MOLOGAWAYA; T KOSTRNOVA; DRUCKER, V; Y SATOH; Y WATANABE, Autotrophic picoplankton were highly abundant during the thermal stratification period in late July in the pelagic area (water depth 500-1300 m) of southern Lake Baikal; maximum numbers were 2 x 10(6) cells ml-1 in the euphotic zone (approximately 15 m). Unicellular cyanobacteria generally dominated the picoplankton community, although unidentified picoplankton that fluoresced red under blue excitation were also abundant (maximum numbers 4 x 10(5) cells ml-1) and contributed up to approximately 40% of the total autotrophic picoplankton on occasions. Carbon and nitrogen biomasses of autotrophic picoplankton estimated by conversion from biovolumes were 14-84 mug C l-1 and 3.6-21 mug N l-1. These were comparable to or exceeded the biomass of heterotrophic bacteria. Autotropic picoplankton and bacteria accounted for as much as 33% of particulate organic carbon and 81% of nitrogen in the euphotic zone. Measurements of the photosynthetic uptake of [C-14]bicarbonate and the growth of picoplankton in diluted or size-fractionated waters revealed that 80% of total primary production was due to picoplankton, and that much of this production was consumed by grazers in the <20 mum cell-size category. These results suggest that picoplankton-protozoan trophic coupling is important in the pelagic food web and biogeochemical cycling of Lake Baikal during summer., OXFORD UNIV PRESS UNITED KINGDOM
    Jornal of Plankton Reserch, 1994, [Reviewed]

MISC

Books and other publications

  • 図説日本のユスリカ　　　　　　　　　　　　　　　
    日本ユスリカ研究会編, Joint work
    文一総合出版, Aug. 2010
    9784829911723
  • 図説日本のユスリカ類（仮）　　　　　　　　　　　　　　　
    近藤繁生; 山本 優; 小林 貞; 平林公男; 河合幸一郎; 大野正彦; 遠藤和雄; 上野隆平; 中里亮治; 粕谷志郎; 北川禮澄, Joint work
    文一総合出版, Sep. 2008
  • Contributions to the Systematics and Ecology of Aquatic Diptera: A Tribute to Ole A. Sæther　　　　　　　　　　　　　　　
    T. Kobayashi; R. Nakazato and M. Higo, Joint work
    The Caddis Press, Ohio, USA, Dec. 2007, [Reviewed]
  • Contributions to the Systematic and Ecology of Aquatic Diptera-A Tribute to Ole　　　　　　　　　　　　　　　
    T. Kobayashi; R. Nakazato; M. Higo, Joint work
    The Caddis Press, Ohio, USA, 2007
  • 陸水の事典　　　　　　　　　　　　　　　
    三田村緒佐武, Joint work
    講談社サイエンティフィク, 2006
  • Chironomidae in Lake Suwa　　　　　　　　　　　　　　　
    「The World of Chironomid」Baifu-kan, 2001
  • A study on phototaxis of adult Chironomidae(Diptera)by artificial light in Lake Suwa, Japan. In CHIRONOMIDS : From Genes to Ecosystems, P. S. Cranston(ed. )　　　　　　　　　　　　　　　
    CSIRO Austraria., 1995
  • 底生動物と魚類の関係.メソコスム湖沼生態系の解析　　　　　　　　　　　　　　　
    名古屋大学出版会, 1993

Lectures, oral presentations, etc.

Affiliated academic society

  • 2008 - Present, 日本水環境学会

Research Themes

Social Contribution Activities

  • 令和４年度 現代的課題対策講座「やさしく学べる SDGs 親子実践講座」　　　　　　　　　　　　　　
    lecturer
    茨城県鹿行生涯学習センター, 16 Oct. 2022
  • 令和3年度茨城エコ・カレッジ講師　　　　　　　　　　　　　　
    lecturer
    Dec. 2021
  • 令和２年度茨城エコ・カレッジ講師　　　　　　　　　　　　　　
    lecturer
    Jan. 2021
  • 令和２年度県民大学後期講座講師　　　　　　　　　　　　　　
    lecturer
    茨城県鹿行生涯学習センター, 14 Oct. 2020
  • 令和元年度茨城エコ・カレッジ講師　　　　　　　　　　　　　　
    lecturer
    10 Aug. 2019