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Haruka Takagi

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Historical Geology and Paleontology Group

Department of Earth Sciences

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  • Jan. 2021: Moved here as an assistant professor (tenure-track)
  • Mar. 2021: Research grant adopted (Showa Seitoku Memorial Foundation)
  • Apr. 2021: Research grant adopted (JSPS Grant-in-Aid for Young Scientists)

    • Research Subjects

    I am interested in species ecology and its interaction to the environments through geologic time. I mainly use planktonic foraminifera both fossils and living organisms in my research. Planktonic foraminifera is a marine calcifying zooplankton that can be preserved in the sediments, which is a useful recorder of paleoenvironment and also a precious record of species evolution by itself.
    My current research focuses on understanding photosymbiosis in planktonic foraminifera. Diversity, functions, partnerships, specificity/flexibility of photosymbiosis are studied using shell geochemistry, chlorophyll fluorometry, molecular biology, and culture experiments.

    Keywords: Planktonic foraminifera, Photosymbiosis, Paleoecology, Evolutonary paleontology, Biological oceanography, Stable isotope, Culture experiment

    Main subjects:
    1. Modern foraminiferal photosymbiosis
    2. Stable isotope paleoecology
    3. Response of planktonic foraminifera to global warming

    Selected Publications

      [1] Takagi, H., Kurasawa, A., Kimoto, K. Observation of asexual reproduction with symbiont transmission in planktonic foraminifera. Journal of Plankton Research, 42, p 403–410, 2020
      [2] Takagi, H., Kimoto, K., Fujiki, T., Saito, H., Schmidt, C., Kucera, M., Moriya, K. Characterizing photosymbiosis in modern planktonic foraminifera. Biogeosciences, 16, p 3377–3396, 2019
      [3] 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, p 127–141, 2019
      [4] 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
      [5] 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, p 46–55, 2018
      [6] Takagi, H., Kimoto, K., Fujiki, T., Kurasawa, A., Moriya, K. Effect of nutritional condition on photosymbiotic consortium of cultured Globigerinoides sacculifer (Rhizaria, Foraminifera). 2018, Symbiosis, 76, p 25–39, 2018
      [7] 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, p 268–284, 2016
      [8] 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, p 44–52, 2016
      [9] 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, p 108–121, 2015
      [10] 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, p 1403–1407, 2014

    Teaching

    Undergraduate Course

    • Laboratory Class of Histroical Geology and Paleontology I
    • Earth Science Seminar
    • Undergraduate Research

    Academic Society Membership

    • Paleontological Society of Japan
    • The Geological Society of Japan
    • The Oceanographic Society of Japan
    • The Plankton Society of Japan
    • Paleosciences Society
    • The Geochemical Society of Japan
    • Japan Geoscience Union
    • European Geosciences Union
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