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西 弘嗣にしひろし
プロフィール
研究活動
| 専門 | 古生物学、地質学、古環境学 |
|---|---|
| 研究活動の紹介 | 地層の研究に関しては，浮遊性有孔虫とよばれる微化石を用いて過去2億年間の地層や海洋底の堆積物の年代を決めています。深海では太平洋，大西洋，インド洋など広い海域の堆積物を検討しています．これに酸素・炭素同位体比変動やジルコンのウランー鉛（U-Pb）年代測定を加えて、さらに高解像度で地質年代が決められるように研究を行っています。また、地球の気候には温室と冷室があり、それぞれの時期の環境は大きく異なっています。それぞれの時期に気温や水温、生物生産、生物の絶滅などが、どのように変化したかも研究しています。これにより、地球の環境変動と生物の進化がどのように結び付いていたかをつきとめたいと思っています。特に、恐竜の生きていた白亜紀の時代に焦点をあてて研究しています。 |
| キーワード | 化石層序、浮遊性有孔虫、古環境 |
著書・論文
(18) Azumi Kuroyanagi, Takahiro Irie, Shunichi Kinoshita1, Hodaka Kawahata, Atsushi Suzuki4, Hiroshi Nishi1, Osamu Sasaki1, Reishi Takashima and Kazuhiko Fujita (2021): Decrease in volum and density of foraminiferal shells with progressing ocean acidification Scientific Reports | (2021) 11:19988, https://doi.org/10.1038/s41598-021-99427-1
(17) Shunichi Kinoshita, Azumi Kuroyanagi, Hodaka Kawahata, Kazuhiko Fujita, Toyoho Ishimura, Atsushi Suzuki, Osamu Sasaki, Hiroshi Nishi (2021): Temperature effects on the shell growth of a larger benthic foraminifer (Sorites orbiculus€i0): Results from culture experiments and micro X-ray computed tomography. Marine Micropaleontology, 163, 101960.
(16) J.Arimoto, H. Nishi, A. Kuroyanagi, R.Takashima, H.i Matsui, M. Ikehara (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.
(15) R. Takashima H. Kusakawa, S. Kuwabara, Y. Orihashi, H. Nishi, M. Niwano, T. Yoshida (2020): Identification of the source caldera for a Pliocene ash-flow tuff in Northeast Japan based on apatite trace-element compositions and zircon U-Pb ages. Journal of Volcanology and Geothermal Research, 401 1069-48.
(14) S. Kuwabara, R. Takashima, Y. Orihashi, H. Nishi, T. Satoh, K. Hayashi (2019): Preliminary tephrochronological study of the Yezo Group (uppermost Albian-basal Campanian) in north Japan. Cretaceous Research, 103 104-158.
(13) R. Takashima, H. Nishi, T. Yamanaka, Y. Orihashi, Y. Tsujino, X. Quidelleur, K. Hayashi, K. Sawada, H. Nakamura and T. Ando (2019): Establishment of Upper Cretaceous bio- and carbon isotope stratigraphy in the northwest Pacific Ocean and radiometric ages around the Albian/Cenomanian, Coniacian/Santonian and Santonian/Campanian boundaries. Newsletters on Stratigraphy, 52-3, 341-376.
(12) A. Kuroyanagi, T. Toyofuku, Y. Nagai, K. Kimoto, H. Nishi, R. Takashima, and H. Kawahata (2019): Effect of Euxinic Conditions on Planktic Foraminifers: Culture Experiments and Implications for Past and Future Environments. Paleoceanography, 34, 54-62.
(11) S. J. Batenburg, O. Friedrich, K. Moriya, S. Voigt, C. Cournède, I. Moebius, P. Blum and the IODP Expedition 342 Scientists (2018): Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342), Newsletters on Stratigraphy, vol.51/2, 245-260
(10) H. Koyasu, H.Nishi, R. Takashima and N. Suzuki (2019): Cretaceous Radiolarian Biostratigraphy in the Yezo Group, Hokkaido, Northeast Japan,. Newsletters on Stratigraphy, 52-3, 297-319.
(9) J. Arimoto, R. Takashima, H. Nishi, T. Yamanaka, Y. Orihashi, S. Jo, K. Yamamoto, K. Umetsu (2018): Constraining the depositional age of an Upper Cretaceous non-marine and shallow marine siliciclastic succession, Kuji Group, northeastern Japan, based on carbon isotope stratigraphy and U-Pb radiometric dating. Cretaceous Research 92, 1-22.
(8) Tatsuhiko Yamaguchi, André Bornemann, Hiroki Matsui Hiroshi Nishi (2017): Latest Cretaceous/Paleocene deep-sea ostracode fauna at IODP Site U1407 (western North Atlantic) with special reference to the Cretaceous/Paleogene boundary and the Latest Danian Event. Marine Micropaleontology, 135, 32-44.
(7) H. Matsui, H. Nishi, A. Kuroyanagi, H. Hayashi, M. Ikehara and R. Takashima (2017). Vertical thermal gradient history in the eastern equatorial Pacific during the early to middle Miocene: Implications for the equatorial thermocline development. Paleoceanography, 32, 729-743.
(6) Takashima, R., Kuwabara, S., Sato, T., Takemura, K., Nishi, H. (2017). Utility of trace elements in apatite for discrimination and correlation of Quaternary ignimbrites and co-ignimbrite ashes, Japan. Quaternary Geochronology, vol. 41, 151-192.
(5) Ando, T., Sawada, K., Okano, K., Takashima, R., Nishi, H., (2017). Marine primary producer community during the mid-Cretaceous oceanic anoxic events (OAEs) 1a, 1b and 1d in the Vocontian Basin (SE France) evaluated from triaromatic steroids in sediments. Organic Geochemistry, vol. 106, 13-24.
(4) Yamaguchi, T., Honda, R., Matsui, H., Nishi, H (2017): Sexual shape dimorphism and selection pressure on males in fossil ostracodes. Paleobiology, DOI: 10.1017/pab.2016.57.
(3) H. Uchimura, H. Nishi, R. Takashima, A. Kuroyanagi , Y. Yamamoto, S. Kuttreolf (2016): Distribution of recent benthic foraminifera off of western Costa Rica in the eastern equatorial Pacific Ocean. Paleontological Reseach, vol. 21(4), 380-396.
(2) T. Ando, K. Sawada, H. Nakamura, K. Omatsu, R.Takashima and H. Nishi (2017): Depositional environments and maturity evaluated by biomarker analyses of sediments deposited across the Cenomanian-Turonian boundary in the Yezo Group, Tomamae area, Hokkaido, Japan. Island Arc，vol. 26, e12178. DOI: 10.1111/iar.12178.
(1) B. R. Gyawali, H.Nishi, R. Takashima, J. O. Herrle, H. Takayanagi, Jean-Louis Latil, Y. Iryu (2017): Upper Albian–upper Turonian calcareous nannofossil biostratigraphy and chemostratigraphy in the Vocontian Basin, southeastern France. News on Stratigraphy, vol. 50(2), 111-139,
社会・地域活動
日本古生物学会評議員、日本地質学会理事、日本地球惑星科学連合理事、日本学術会議会員
教育活動
| 担当科目 | 地球生命史学，地球環境史学，古生物学専攻演習 I，古生物学専攻演習 II，古生物学専攻実験 I，古生物学専攻実験 II |
|---|---|
| オフィスアワー | |
| 相談・講演・共同研究等に応じられるテーマなど | 地質学，古生物学，古環境学，古海洋学に関する分野 |