Education ------------------------------------------------------------------------------------------------

Ph.D          Waseda University (March 2016)

M.Sc.          Waseda University (March 2013)

B.Sc.           Waseda University (March 2011)

 

Academic Experiences ------------------------------------------------------------------------------

2024 –               : Associate professor, AORI, The University of Tokyo

2021 –  2024     : Assistant professor (tenure track), Chiba University

2017 − 2020     : JSPS research fellow PD

2016 − 2017     : Postdoctoral Researcher, AORI, The University of Tokyo

2013 − 2016     : JSPS research fellow DC1

2013 − 2016     : Research student, JAMSTEC

2013 − 2016    : Teaching assistant, Graduate School of Creative Science and Engineering, Waseda University

2012 − 2014    : Student for technical experiences, AIST

2010 − 2013    : Teaching assistant, Faculty of Education, Waseda University

 

Fellowships ----------------------------------------------------------------------------------------------

2017 – 2020   : JSPS Research fellow PD

2013 – 2016   : JSPS Research fellow DC1

2013                : JASSO Repayment Exemption for Students with Particularly Outstanding Results (full exemption)

2007 – 2010    : Azusa Ono Memorial Scholarship, Waseda University

2007 – 2010    : Okuma Memorial Special Scholarship, Waseda University

 

Research Grants --------------------------------------------------------------------------------------

April 2022−March 2029: JST FOREST (Fusion Oriented REsearch for disruptive Science and Technology), “Disentangling inter-organismal network of marine photosymbiosis”

October 2021−March 2024: JST ACT-X Environment and Biotechnology, “Identification of genes related to photosymbiosis responsible for photosynthesis in marine deserts”  

April 2018−March 2021: Grant-in-Aid for Young Scientists, JSPS   “Investigating evolution and diversification of ocean plankton from a view point of photosymbiosis: A case for planktic foraminifers”

April 2017−March 2020: Grant-in-Aid for JSPS Fellows (PD), JSPS    “Reconstruction of marine plankton biomass: Proxy development based on photosymbiotic planktic foraminifers”

August 2016−March 2017: Grant-in-Aid for Research Activity Start-up, JSPS   “Photophysiology and symbiotic partnership of planktic foraminifers”

April 2013−March 2016: Grant-in-Aid for JSPS Fellows (DC1), JSPS    “Investigation on photosymbiosis in planktic foraminifers: Approach from culture experiment, stable isotopes, and ontogenetic analysis”

 

Awards ----------------------------------------------------------------------------------------------------

June 2022             : PEPS Most Cited Paper Award 2022

April 2022            : The Okada Prize, The Oceanographic Society of Japan

November 2020  : Paleosciences Society Award for Young Scientists 2019

June 2020             : PEPS Most Downloaded Paper Award 2020

June 2017             : 2016 Best Paper Award, Paleontological Society of Japan

September 2016  : Best Oral Presentation Award, The Oceanographic Society of Japan Fall Meeting 2016

March 2016          : Azusa Ono Memorial Award (Academic Field), Waseda University

June 2015              : Excellent Poster Award, Paleontological Society of Japan Annual Meeting 2015

March 2015          : Young Scientist Award, Blue Earth 2015

March 2015          : Best Poster Award, The Oceanographic Society of Japan Spring Meeting 2015

February 2015     : Outstanding Student Presentation Award (Oral), Aquatic Science Meeting 2015

May 2014             : Outstanding Student Presentation Award of Biogeosciences (Oral), Japan Geoscience Union Meeting 2014

June 2013             : Excellent Poster Award, Paleontological Society of Japan Annual Meeting 2013

March 2013          : Azusa Ono Memorial Award (Academic Field), Waseda University

May 2012             : Outstanding Student Presentation Award of Biogeosciences (Oral), Japan Geoscience Union Meeting 2012

 

Affiliations ---------------------------------------------------------------------------------------------

The Micropalaeontological Society 

Cushman Foundation for Foraminiferal Research 

The Oceanographic Society of Japan

Japan Geoscience Union

The Geochemical Society of Japan

Paleontological Society of Japan

Paleosciences Society

The Plankton Society of Japan

The Geological Society of Japan

 

Cruises ----------------------------------------------------------------------------------------------------

October – November 2019 : R/V Hakuho-Maru (KH-19-6)

September – October 2017 : R/V Hakuho-Maru (KH-17-4)

August – September 2017  : FS Meteor (M140) 

December 2016                : R/V Hakuho-Maru (KH-16-7)

July 2016                           : R/V Shinsei-Maru (KS-16-9)

June 2014                           : R/V Kaiyo (KY14-09)

February – March 2014   : R/V Mirai (MR14-02)

July 2013                           : R/V Mirai (MR13-04)

June – August 2012         : JOIDES Resolution (IODP Exp. 342 Paleogene Newfoundland Sediment Drifts)

April 2012                         : R/V Tansei-Maru (KT-12-04)

 

Others -----------------------------------------------------------------------------------------------------

February 2016 – June 2017: Scientific Steering Committee, 3rd PICES/ICES Early Career Scientist Meeting, Busan

February 2013       : IODP Exp. 342 Editorial Meeting, Texas A & M University

November 2009    : IYPE Planet Earth Lisbon Event 2009

 

Publications --------------------------------------------------------------------------------------------

Takagi, H., Kimoto, K., Fujiki T. Photosynthetic carbon assimilation and electron transport rates in two symbiont-bearing planktonic foraminifera. Frontiers in Marine Science, 9, 803354, 2022 

Takagi, H., Kurasawa, A., Kimoto, K. Observation of asexual reproduction with symbiont transmission in planktonic foraminifera. Journal of Plankton Research, 42, pp 403–410, 2020

Takagi, H., Kimoto, K., Fujiki, T., Saito, H., Schmidt, C., Kucera, M., and Moriya, K., Characterizing photosymbiosis in modern planktonic foraminifera. Biogeosciences, 16, pp 3377–3396, 2019

Meilland, J., Siccha, M., Weinkauf, M. F. G., Jonkers, L., Morard, R., Baranowski, U., Baumeister, A., Bertlich, J., Brummer, G-J., Debray, P., Fritz-Endres, T., Groeneveld, J., Magerl, L., Munz, P., Rillo, M. C., Schmidt, C., Takagi, H., Theara, G., Kucera, M. Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera. Journal of Plankton Research, 41, pp 127–141, 2019

Kawahata, H., Fujita, K.,  Iguchi, A,  Inoue, M., Iwasaki, S., Kuroyanagi, A., Maeda, A., Manaka, T., Moriya, K., Takagi, H., Toyofuku, T., Yoshimura, T., Suzuki, A., Perspective on the response of marine calcifiers to global warming and ocean acidification – Behavior of corals and foraminifera in a high CO2 world “hot house”. Progress in Earth and Planetary Science, 6:5, 2019

Hori, M., Kimoto, K., Shirai, K., Kurasawa, A., Takagi, H., Ishida, A., Takahata, N., Sano, Y. Chamber formation and trace element distribution in the calcite walls of laboratory cultured planktonic foraminifera (Globigerina bulloides and Globigerinoides ruber). Marine Micropaleontology, 140, pp 46–55, 2018

Takagi, H., Kimoto, K., Fujiki, T., Moriya, K. Effect of nutritional condition on photosymbiotic consortium of cultured Globigerinoides sacculifer (Rhizaria, Foraminifera). Symbiosis, 76, pp 25–39, 2018

Takagi, H., Moriya, K., Ishimura, T., Suzuki, A., Kawahata, H., Hirano., H. Individual migration pathways of modern planktic foraminifers: Chamber-by-chamber assessment of stable isotopes. Paleontological Research, 20, pp 268–284, 2016

Takagi, H., Kimoto, K., Fujiki, T., Kurasawa, A., Moriya, K., Hirano, H. Ontogenetic dynamics of photosymbiosis in cultured planktic foraminifers revealed by fast repetition rate fluorometry. Marine Micropaleontology, 122, pp 44–52, 2016

Takagi, H., Moriya, K., Ishimura, T., Suzuki, A., Kawahata, H., Hirano., H. Exploring photosymbiotic ecology of planktic foraminifers from chamber-by-chamber isotopic history of individual foraminifers. Paleobiology, 41, pp 108–121, 2015

Fujiki, T., Takagi, H., Kimoto, K., Kurasawa, A., Yuasa, T., Mino, Y. Assessment of algal photosynthesis in planktic foraminifers by fast repetition rate fluorometry. Journal of Plankton Research, 36, pp 1403–1407, 2014

Flemings P. B., Polito P. J., Pettigrew T. L., Iturrino G. J., Meissner E., Aduddell R., Brooks D. L., Hetmaniak C., Huey D., Germaine J. T., the IODP Expedition 342 Scientists. The motion decoupled delivery system: A new deployment system for downhole tools is tested at the New Jersey Margin. Scientific Drilling, 15, pp 51–63, 2013

Norris R.D., Wilson, P.A., Blum, P., the Expedition 342 Scientists. Proceedings of the Integrated Ocean Drilling Program Expedition 342; Paleogene Newfoundland sediment drifts and MDHDS test, College Station, TX, Integrated Ocean Drilling Program, 2014, doi:10.2204/iodp.proc.342.2014

Expedition 342 Scientists. Paleogene Newfoundland sediment drifts. IODP Preliminary Report, 342, College Station, TX, Integrated Ocean Drilling Program, 2012, doi:10.2204/iodp.pr.342.2012

 

Presentations (selected) --------------------------------------------------------------------------

Oral presentations at international meetings

Takagi, H., Fujiki, T., Kimoto, K., Moriya, K., Saito, H. Disclosing photosymbiosis in modern planktic foraminifers. FORAMS2018 (Edinburgh, UK, 6/2018)

Takagi, H. Individual ecology of tiny protistan zooplankton: Investigation on photosymbiotic ecology of planktic foraminifers. 3rd PICES/ICES Early Career Scientist Conference, (Busan, South Korea, 6/2017) 

Takagi, H., Kimoto, K., Fujiki, T., Hirano, H. Photosymbiosis in planktic foraminifers: New aspects from culture and fast repetition rate fluotrometry. ASLO Aquatic Science Meeting 2015, (Granada, Spain, 2/2015)

Takagi, H., Kimoto, K., Fujiki, T., Kurasawa, A., Hirano, H. Measuring photosynthesis of symbiont-bearing planktic foraminifers and implications for ecological difference. International Symposium on Foraminifera 2014 (Concepcion, Chille, 1/2014)

Takagi, H., Moriya, K., Ishimura, T., Suzuki, A., Kawahata, H., Hirano., H., IODP Exp. 330 Scientists. Individual ontogenetic stable isotope records of Recent planktonic foraminifers: Testing for algal photosymbiosis. EGU General Assembly 2012 (Vienna, Austria, 4/2012)

 

Poster presentations at international meetings

Takagi, H., Fujiki, T., Kimoto, K., Moriya, K. Experimental study of growth and photophysiology Globigerinoides sacculifer to understand host-symbiont nutritional interactions. FORAMS2018 (Edinburgh, UK, 6/2018)

Takagi, H., Fujiki, T., Kimoto, K. Light dependent photophysiology and carbon fixation in symbiont bearing planktic foraminifers. AQUAFLUO II Chlorophyll Fluorescence in Aquatic Sciences (Sydney, Australia, 12/2017) 

Takagi, H., Moriya, K., Ishimura, T. Ontogenetic stable isotope records of Eocene planktic foraminifers: Comparison to modern symbiotic species observation. IODP Exp. 342 Post-Cruise Science Meeting, (Snowbird, UT, USA, September 2015)

Takagi, H., Moriya, K., Ishimura, T., Suzuki, A., Kawahata, A., Hirano, H. Chamber-by-chamber isotopic history of individual planktic foraminifers: Detection of photosymbiotic ecology from fossils. 11th International Conference on Paleoceanography, (Sitges, Spain, September. 2013)

Takagi, H., Moriya, K., Ishimura, T., Suzuki, A., Kawahata, H., Hirano., H. Ontogenetic stable isotope records of modern planktic foraminifers from Sagami Bay, Japan. Goldschmidt 2013 (Florence, Italy, 8/2013)

Fujiki, T., Takagi, H., Kimoto, K., Kurasawa, A., Yuasa, T., Mino, Y. Assessment of algal photosynthesis in planktic foraminifers by fast repetition rate fluorometry. Aquatic Science Meeting 2015, (Granada, Spain, February 2015)