Senior Researcher, Environmental Chemistry Section

• Study of microbial functional genes involved in mercury methylation and demethylation in the ocean

• Uptake and accumulation of methylmercury by marine phytoplankton

Natural Environment group

1. Y. Tada, K. Marumoto, A. Takeuchi [Nitrospina-like Bacteria Are Dominant Potential Mercury Methylators in Both the Oyashio and Kuroshio Regions of the Western North Pacific], Microbiology Spectrum, 9(2), e00833-21 (2021).
2. M. Nagano, M. Fujimura, Y. Tada, Y. Seko [Dietary Fructooligosaccharides Reduce Mercury Levels in the Brain of Mice Exposed to Methylmercury], Biological and Pharmaceutical Bulletin, 44(4), 522-527 (2021)
3. S. Goto, Y. Tada, K. Suzuki, Y. Yamashita [Evaluation of the production of dissolved organic matter by three marine bacterial strains], Frontiers in Microbiology, 11, 2553 (2020).
4. Y. Cui, S. K. Wong, R. Kaneko, A. Mouri, Y. Tada, I. Nagao, S. J. Chun, H.G. Lee, C. Y. Ahn, H. M. Oh, Y. Sato-Takabe, K. Suzuki, H. Fukuda, T. Nagata, K. Kogure, K. Hamasaki [Distribution of dimethylsulfoniopropionate degradation genes reflects strong water current dependencies in the Sanriku coastal region in Japan: from mesocosm to field study], Frontiers in Microbiology, 11, 1372 (2020).
5. Y. Tada, K. Marumoto, A. Takeuchi [Nitrospina-Like Bacteria are Potential Mercury Methylators in the Mesopelagic Zone in the East China Sea], Frontiers in Microbiology, vol. 11, 1369 (2020).
6. T. Shiozaki,Y. Tada, H. Fukuda, K. Furuya, T. Nagata [Primary production and nitrogen assimilation rates from bay to offshore waters in the oyashio-kuroshio-Tsugaru Warm Current interfrontal region of the northwestern north Pacific Ocean], Deep Sea Research Part I: Oceanographic Research Papers, 103304 (2020).
7. Y. Tada, K. Marumoto [Uptake of methylmercury by marine microalgae and its bioaccumulation in them], Journal of Oceanography, vol 76: p63-70 (2020).
8. Y. Mizuno,　J. Nishioka, T. Tanaka, Y. Tada, K. Suzuki, Y. Tsuzuki, A. Sugimoto, Y. Yamashita [Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter], Journal of Oceanography, Springer, vol. 74: p509-521 (2018)
9. I. Nagao, Y. J. Eum, Y. Iwamoto, Y. Tada, K. Suzuki, A. Tsuda, M. Toratani, K. Hamasaki, M. Uematsu [Biogenic sulfur compounds in spring phytoplankton bloom in the western North Pacific off the coast of northern Japan], Progress in Oceanography, Elsevier, vol. 165: p145-157 (2018)
10. Y. Tada, R. Nakaya, S. Goto, Y. Yamashita and K. Suzuki [Distinct bacterial community and diversity shifts after phytoplankton-derived dissolved organic matter addition in a coastal environment], Journal of Experimental Marine Biology and Ecology, Elsevier, vol. 495:p119-128 (2017)
11. S. Goto,Y. Tada, K. Suzuki and Y. Yamashita [Production and reutilization of fluorescent dissolved organic matter by a marine bacterial strain, Alteromonas macleodii], Frontiers in Microbiology, vol. 8:507 (2017)
12. Y. Tada, T. Shiozaki, H. Ogawa and K. Suzuki [Basin-scale distribution of prokaryotic phylotypes in the epipelagic layer of the Central South Pacific Ocean during austral summer], Journal of Oceanography, Springer, vol. 73:p145-158 (2017)
13. Y. Tada and K. Suzuki [Changes in the community structure of free-living heterotrophic bacteria in the open tropical Pacific Ocean in response to microalgal lysate-derived dissolved organic matter], FEMS Microbiology and Ecology, Oxford, fiw099 (2016)
14. Y. Yamada, H. Fukuda, Y. Tada, K. Kogure and T. Nagata [Bacterial enhancement of gel particle coagulation in seawater], Aquatic Microbial Ecology, Inter-Research, vol. 77:p11-22 (2016)
15. K. Tsuchiya, VS. Kuwahara, K. Hamasaki, Y. Tada, T. Ichikawa, T. Yoshiki, R. Nakajima, A. Imai, S. Shimode and T. Toda [Typhoon-induced response of phytoplankton and bacteria in temperate coastal waters], Estuarine, Coastal and Shelf Science, Elsevier, vol. 167:p458-465 (2015)
16. K. Hamasaki, A. Taniguchi, Y. Tada, R. Kaneko and T. Miki [Active populations of rare microbes in oceanic environments as revealed by bromodeoxyuridine incorporation and 454 tag sequencing], GENE, Elsevier, vol. 576:p650-656 (2015)
17. K. Tsuchiya, T. Sano, N. Kawasaki, H. Fukuda, N. Tomioka, K. Hamasaki,Y. Tada, S. Shimode, T. Toda and A. Imai [New radioisotope-free method for measuring bacterial production using [15N5]-2’-deoxyadenosine and liquid chromatography mass spectrometry (LC–MS) in aquatic environments], Journal of Oceanography, Springer, vol. 71:p675-683 (2015)
18. Y. Sato-Takabe, S. Suzuki, R. Shishikura, K. Hamasaki, Y. Tada, T. Kataoka, T. Yokokawa, N, Yoshie and S. Suzuki [Spatial distribution and cell size of aerobic anoxygenic phototrophic bacteria in the Uwa Sea, Japan], Journal of Oceanography, Springer, vol. 71: p151-159 (2014)
19. Y. Tada and H-P. Grossart [Community shifts of actively growing lake bacteria after N-acetyl-glucosamine addition: improving the BrdU-FACS method], ISME Journal, Nature Publishing Group, vol. 8: p441-454 (2014)
20. N. Kawasaki, K. Komatsu, A. Kohzu, N. Tomioka, R. Shinohara, T. Satou, F. Watanabe, Y. Tada, K. Hamasaki, M. R. M. Kushairi and A. Imai [Bacterial contribution to dissolved organic matter in eutrophic Lake Kasumigaura, Japan], Applied and Environmental Microbiology, American Society for Microbiology, vol. 79: p 7160-7168 (2014)
21. R. Nakajima, K. Tsuchiya, N. Nakatomi, T. Yoshida, Y. Tada, F. Konno, T. Toda, V. S. Kuwahara, K. Hamasaki, B. H. R. Othaman, T. C. Segaran and A. W. M. Effendy [Enrichment of microbial abundance in the sea-surface microlayer over a coral reef: implications for biogeochemical cycles in reef ecosystems], Marine Ecology Progress Series, Inter-Research, vol. 490: p11-22 (2013)
22. Y. Tada, R. Makabe, N. Kasamatsu-Takazawa, A. Taniguchi and K. Hamasaki [Growth and distribution patterns of Roseobacter/Rhodobacter, SAR11, and Bacteroidetes lineages in the Southern Ocean], Polar Biology, Springer, vol. 36: p691-704 (2013)
23. Y. Tada, A. Taniguchi, Y. Sato-Takabe and K. Hamasaki [Growth and succession patterns of major phylogenetic groups of marine bacteria during a mesocosm diatom bloom], Journal of Oceanography, Springer, vol. 68: p509-519 (2012)
24. M. Fujinoki, T. Koito, Y. Fujiwara, M. Kawato,Y. Tada, K. Hamasaki, M. Jimbo and K. Inoue [Whole-mount fluorescence in situ hybridization to visualize symbiotic bacteria in the gills of deep sea mussels], Aquatic Biology, Inter-Research, vol. 14: p135-140 (2012)
25. Y. Tada, A. Taniguchi, I. Nagao, T. Miki, M. Uematsu, A. Tsuda and K. Hamasaki [Differing growth responses of major phylogenetic groups of marine bacteria to natural phytoplankton blooms in the western North Pacific], Applied and Environmental Microbiology, American Society for Microbiology, vol. 77: p4055-4065 (2011)
26. A. Taniguchi, Y. Tada and K. Hamasaki [Seasonal Variations in the Community Structure of Actively Growing Bacteria in Neritic Waters of Hiroshima Bay, Western Japan], Microbes & Environments, Japanese Society of Microbial Ecology and the Japanese Society of Soil Microbiology, vol. 26: p339-346 (2011)
27. Y. Tada, A. Taniguchi and K. Hamasaki [Phylotype-specific growth rates of marine bacteria measured by bromodeoxyuridine immunocytochemistry and fluorescence in situ hybridization], Aquatic Microbial Ecology, Inter-Research, vol. 59: p229-238 (2010)
28. Y. Tada, A. Taniguchi and K. Hamasaki [Phylotype-specific productivity of marine bacterial populations in eutrophic seawater, as revealed by bromodeoxyuridine immunocytochemistry combined with fluorescence in situ hybridization], Microbs & Environments, Japanese Society of Microbial Ecology and the Japanese Society of Soil Microbiology, vol. 24: p315-321 (2009)
29. K. Hamasaki, A. Taniguchi, Y. Tada, R. A. Long and F. Azam [Actively growing bacteria in the Inland Sea of Japan, identified by combined bromodeoxyuridine immunocapture and denaturing gradient gel electrophoresis], Applied and Environmental Microbiology, American Society for Microbiology, vol. 73: p2787-2798 (2007)

1. Environment Research and Technology Development Fund from Ministry of the Environment, SⅡ-6-3(2), Collaborator, 2020 – 2022
2. JSPS Grants-in-Aid for Scientific Research (C), 17K07896, Representative, 2017 - 2020
3. Environment Research and Technology Development Fund from Ministry of the Environment, 5-1702, Collaborator, 2018 - 2019
4. JSPS Grants-in-Aid for Young Scientists (B), 26740001, Representative, 2014 - 2016
5. Grant-in-Aid for JSPS Research Fellows PD, 13J04633, 2013 - 2016
6. Leibniz Institute for Freshwater ecology and Inland fisheries (IGB) Postdoc fellowship, Oct 2011 - Mar 2012
7. Grant-in-Aid for JSPS Research Fellows DC2, 07J02357, 2007 - 2009

2004 B. S., Faculty of Applied Biological Science, Hiroshima University
2006 M.S., Graduate School of Biosphere Science, Hiroshima University
2010 Ph. D. Graduate School of Agricultural and Life Sciences, The University of Tokyo
2010 - 2011 Atmosphere and Ocean Research Institute, The University of Tokyo, Postdoctoral fellow
2011 - 2012 Leibniz Institute for Freshwater ecology and Inland fisheries (IGB), Post-doctoral fellow
2012 - 2013 Atmosphere and Ocean Research Institute, The University of Tokyo, Postdoctoral fellow
2013 - 2016 Faculty of Environmental Earth Science, Hokkaido University, JSPS Research Fellows PD
2016 - Dec 2017 Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Project Scientist
Jan 2018 - present National Institute for Minamata Disease, Postdoctoral Researcher
Apr 2020 - present National Institute for Minamata Disease, Senior Researcher