Assistant Professor:Azumi Kuroyanagi

Assistant Professor:Azumi Kuroyanagi

Assistant Professor:Azumi Kuroyanagi

Research field

Micropaleontology & paleoceanography

Research Interests

  •  Planktonic foraminifera as proxy for oceanic environment


Selected papers
  1. Kuroyanagi, A., Irie, T., Kinoshita, S., Kawahata, H., Suzuki, A., Nishi, H., Sasaki, O., Takashima, R., Fujita, K. (2021) Decrease in volume and density of foraminiferal shells with progressing ocean acidification. Scientific Reports, 11, 19988. DOI: 10.1038/s41598-021-99427-1
  2. Kinoshita, S., Kuroyanagi, A., Kawahata, H., Fujita, K., Ishimura, T., Suzuki, A., Sasaki, O., Nishi, H. (2021) Temperature effects on the shell growth of a larger benthic foraminifer (Sorites orbiculus): Results from culture experiments and micro X-ray computed tomography. Marine Micropaleontol., 163, 101960. DOI: 10.1016/j.marmicro.2021.101960
  3. Kuroyanagi, A., Kawahata, H., Ozaki, K., Suzuki, A., Nishi, H., Takashima, R. (2020) What drove the evolutionary trend of planktic foraminifers during the Cretaceous: Oceanic Anoxic Events (OAEs) directly affected it? Marine Micropaleontology, 161, 101924. DOI: 10.1016/j.marmicro.2020.101924
  4. Arimoto, J., Nishi, H., Kuroyanagi, A., Takashima, R., Matsui, H., Ikehara, M. (2020) Changes in upper ocean hydrography and productivity across the Middle Eocene Climatic Optimum: Local insights and global implications from the Northwest Atlantic. Global and Planetary Change, 193, 103258. DOI: 10.1016/j.gloplacha.2020.103258
  5. Kuroyanagi, A., Toyofuku, T., Nagai, Y., Kimoto, K., Nishi, H., Takashima, R., Kawahata, H. (2019) Effect of euxinic conditions on planktic foraminifers: Culture experiments and implications for past and future environments. Paleoceanography and Paleoclimatology, 34. DOI: 10.1029/2018PA003539
  6. Kawahata, H., Fujita, K., Iguchi, A., Inoue, M., Iwasaki, S., Kuroyanagi, A., Maeda1, A., Manaka, T., Moriya, K., Takagi, H., Toyofuku, T., Yoshimura, T., Suzuki, A. (2019). Perspective of the response by marine calcifiers to global warming and ocean acidification—Behavior of corals and foraminifers in the high CO2 world in “hot house”. Progress in Earth and Planetary Science, 5. DOI: 10.1186/s40645‐018‐0239‐9
  7. Iwasaki, S., Kimoto, K., Kuroyanagi, A., Kawahata, H. (2017) Horizontal and vertical distributions of planktic foraminifera in the subarctic Pacific. Marine Micropaleontology, 130, pp. 1-14. DOI: 10.1016/j.marmicro.2016.12.001
  8. Kawahata, H., Ishizaki, Y., Kuroyanagi, A., Suzuki, A., Ohkushi, K.-I. (2017) Quantitative reconstruction of temperature at a Jōmon site in the Incipient Jōmon Period in northern Japan and its implications for the production of early pottery and stone arrowheads. Quaternary Science Reviews, 157, pp. 66-79. DOI: 10.1016/j.quascirev.2016.12.009
  9. Matsui, H., Nishi, H., Kuroyanagi, A., Hayashi, H., Ikehara, M., Takashima, R. (2017) Vertical thermal gradient history in the eastern equatorial Pacific during the early to middle Miocene: Implications for the equatorial thermocline development. Paleoceanography, 32 (7), pp. 729-743. DOI: 10.1002/2016PA003058
  10. Uchimura, H., Nishi, H., Takashima, R., Kuroyanagi, A., Yamamoto, Y., Kutterolf, S. (2017) Distribution of Recent Benthic Foraminifera off Western Costa Rica in the Eastern Equatorial Pacific Ocean. Paleontological Research, 21 (4), pp. 380-396. DOI: 10.2517/2017PR003
  11. Yoshimura, T., Tamenori, Y., Suzuki, A., Kawahata, H., Iwasaki, N., Hasegawa, H., Nguyen, L.T., Kuroyanagi, A., Yamazaki, T., Kuroda, J., Ohkouchi, N. (2017) Altervalent substitution of sodium for calcium in biogenic calcite and aragonite. Geochimica et Cosmochimica Acta, 202, pp. 21-38. DOI: 10.1016/j.gca.2016.12.003
  12. Matsui, H., Nishi, H., Takashima, R., Kuroyanagi, A., Ikehara, M., Takayanagi, H., Iryu, Y. (2016) Changes in the depth habitat of the Oligocene planktic foraminifera (Dentoglobigerina venezuelana) induced by thermocline deepening in the eastern equatorial Pacific. Paleoceanography, 31 (6), pp. 715-731. DOI: 10.1002/2016PA002950
  13. Yoshimura, T., Tamenori, Y., Takahashi, O., Nguyen, L.T., Hasegawa, H., Iwasaki, N., Kuroyanagi, A., Suzuki, A., Kawahata, H. (2015) Mg coordination in biogenic carbonates constrained by theoretical and experimental XANES. Earth and Planetary Science Letters,421, 68-74. DOI: 10.1016/j.epsl.2015.03.048
  14. Kuroyanagi, A., da Rocha, R.E., Bijma, J., Spero, H., Russel, A.D., Eggins, S.M., Kawahata, H. (2013) Effect of dissolved oxygen concentration on planktonic foraminifera through laboratory culture experiments and implications for oceanic anoxic events. Marine Micropaleontology, Vol. 101, pp. 28-32. doi: 10.1016/j.marmicro.2013.04.005
  15. Kuroyanagi, A., da Rocha, R.E., Bijma, J., Spero, H., Russel, A.D., Eggins, S.M., Kawahata, H. (2013) Effect of dissolved oxygen concentration on planktonic foraminifera through laboratory culture experiments and implications for oceanic anoxic events. Marine Micropaleontology, Vol. 101, pp. 28-32. doi: 10.1016/j.marmicro.2013.04.005
  16. Sagawa, T., Kuroyanagi, A., Irino, T., Kuwae, M., Kawahata, H. (2013) Seasonal variations in planktonic foraminiferal flux and oxygen isotopic composition in the western North Pacific: Implications for paleoceanographic reconstruction. Marine Micropaleontology, Vol. 100, pp. 11-20. doi: 10.1016/j.marmicro.2013.03.013
  17. Kuroyanagi, A., Kawahata, H., Nishi, H. (2011) Seasonal variation in the oxygen isotopic composition of different-sized planktonic foraminifer Neogloboquadrina pachyderma (sin.) in the northwestern North Pacific, and implications for reconstruction of the paleo-environment. Paleoceanography. doi:10.1029/2011PA002153
  18. Dueñas-Bohórquez, A., da Rocha, R.E., Kuroyanagi, A., de Nooijer, L.J., Bijma, J., Reichart, G.J. (2011) Interindividual variability and ontogenetic effects on Mg and Sr incorporation in the planktonic foraminifer Globigerinoides sacculifer. Geoghimica et cosmochimica acta, Vol. 75, pp. 520-532. doi: 10.1016/j.gca.2010.10.006
  19. Kawahata, H., Ohshima, H., Kuroyanagi, A. (2011) Terrestrial - ocean environmental change in the northwestern Pacific from the glacial times to Holocene. Asian Earth Science, Vol. 40, pp. 1189-1202. doi: 10.1016/j.jseaes.2010.10.007
  20. Hikami, M., Ushie, H., Irie, T., Fujita, K., Kuroyanagi, A., Nojiri, H., Sakai, K., Suzuki, A., Kawahata, H. (2011) Contrasting calcification responses to ocean acidification between two reef foraminifers harboring different algal symbionts. Geophysical Research Letters, Vol. 38, L19601. doi:10.1029/2011GL048501
  21. Fujita, K., Hikami, M., Suzuki, A., Kuroyanagi, A., Sakai, K., Kawahata, H., Nojiri, H. (2011) Effects of ocean acidification on calcification of symbiont-bearing reef foraminifers. Biogeoscience, Vol. 8, pp. 2089-2098. doi:10.5194/bg-8-2089-2011
  22. Kuroyanagi, A., Kawahata, H., Suzuki, A., Fujita, K., Irie, T. (2009) Impacts of ocean acidification on large benthic foraminifers: Results from laboratory experiments. Marine Micropaleontology, Vol. 73, pp. 190-195. doi: 10.1016/j.marmicro.2009.09.003
  23. Dueñas-Bohórquez, A., da Rocha, R.E., Kuroyanagi, A., Bijma, J., Reichart, G.J. (2009) Effect of salinity and seawater calcite saturation state on Mg and Sr incorporation in cultured planktonic foraminifera. Marine Micropaleontology, Vol. 73, pp. 178-189. doi: 10.1016/j.marmicro.2009.09.002
  24. Kawahata, H., Minoshima, K., Ishizaki, Y., Yamaoka, K., Gupta L.P., Nagao, M., Kuroyanagi, A. (2009) Comparison of settling particles and sediments at IMAGES coring site in the northwestern North Pacific - Effect of resuspended particles on paleorecords. Sedimentary Geology, Vol. 222, pp. 254-262. doi: 10.1016/ j.sedgeo.2009.09.012
  25. Kuroyanagi, A., Tsuchiya, M., Kawahata, H., Kitazato, H. (2008) Paleo-environmental implications of two genotypes of the planktonic foraminifer Globigerinoides ruber (white). Marine Micropaleontology, Vol. 68, pp. 236-243. doi: 10.1016/j.marmicro.2008.04.004
  26. Kuroyanagi, A., Kawahata, H., Nishi, H., Honda, M.C. (2008) Seasonal to interannual changes in planktonic foraminiferal assemblages in the northwestern North Pacific: sediment trap results encompassing a warm period related to El Ni?o. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 262, pp. 115-135. doi: 10.1016/j.palaeo.2008.02.012
  27. Kuroyanagi, A., Kawahata, H., Narita, H., Ohkushi, K., Aramaki, T. (2006) Reconstruction of paleoenvironmental changes based on the planktonic foraminiferal assemblages off Shimokita (Japan) in the northwestern Pacific. Global Planetary Change, Vol. 53, pp. 92-107. doi: 10.1016/j.gloplacha.2006.01.015
  28. Kuroyanagi, A., Kawahata, H. (2004) Vertical distribution of living planktonic foraminifera in the seas around Japan. Marine Micropaleontology, Vol. 53, pp. 173-196. doi:10.1016/j.marmicro.2004.06.001
  29. Kuroyanagi, A., Kawahata, H., Nishi, H., Honda, M.C. (2002) Seasonal changes in planktonic foraminifera in the northwestern North Pacific Ocean: sediment trap experiments from subarctic and subtropical gyres. Deep-Sea Research II, Vol. 49, pp. 5627-5645.


  1. PALEO10: Paleosciences Society “地球環境史学会貢献賞” (23 October 2021)
  2. Japan Geoscience Union (JpGU) The 4th Nishida Prize (1 June 2021)