Details of a Researcher - Fujita Kazuhiko

Fujita Kazuhiko

写真a

Title	Professor
Researcher Number(JSPS Kakenhi)	00343377

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Current Affiliation Organization 【 display / non-display 】

Duty University of the Ryukyus Graduate School of Engineering and Science Physics and Earth Sciences Professor
Concurrently University of the Ryukyus Graduate School of Engineering and Science Marine and Environmental Sciences Professor

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Academic degree 【 display / non-display 】

Tohoku University - Science (Geology and Paleoontology)

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External Career 【 display / non-display 】

2007.04

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2012.02

University of the Ryukyus, Faculty of Science, Department of Physics and Earth Sciences, Meteorology Oceanography Sedimentology, Research Associate
2012.03

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2015.04

University of the Ryukyus, Faculty of Science, Department of Physics and Earth Sciences, Meteorology Oceanography Sedimentology, Associate Professor
2015.05

　

　

University of the Ryukyus, Faculty of Science, Department of Physics and Earth Sciences, Meteorology Oceanography Sedimentology, Professor

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Research Interests 【 display / non-display 】

Marine Micropaleontology

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Research Areas 【 display / non-display 】

Natural Science / Biogeosciences

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Research Theme 【 display / non-display 】

Paleoenvironmental changes of coral-reef islands during the last glacial cycle
Past, Present and Future of coral-reef coasts under climate changes
Response to coral-reef calcifying organisms to global environmental changes
Paleoenvironmets of Quaternary coral-reef deposits: proxy developments and high-resolution reconstructions

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Published Papers 【 display / non-display 】

Biogeographical patterns of the porcelaneous larger foraminifer Alveolinella quoyi through the integration of fossil data

Davide Bassi, Yasufumi Iryu, Johannes Pignatti, Kazuhiko Fujita, Willem Renema

Geobios ( Elsevier BV ) 85 1 - 9 2024.08 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Porcelaneous larger foraminiferal responses to Oligocene–Miocene global changes

Davide Bassi, Juan Carlos Braga, Johannes Pignatti, Kazuhiko Fujita, James H. Nebelsick, Willem Renema, Y. Iryu

Palaeogeography, Palaeoclimatology, Palaeoecology ( Elsevier BV ) 634 111916 - 111916 2024.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Public symposium “Biogenic Reefs: Past and Future"

IRYU Yasufumi, ADACHI Natsuko, YAMAMOTO Kazuyuki, FUJITA Kazuhiko, ASAMI Ryuji, YAMANO Hiroya, TAKAYANAGI Hideko

Journal of the Japanese Coral Reef Society ( The Japanese Coral Reef Society ) 26 ( 1 ) 59 - 80 2024 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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A new species of the larger porcelaneous foraminifer Borelis provides novel insights into Neogene to Recent western Pacific palaeobiogeographical dispersal patterns

Bassi, D; Iryu, Y; Kinoshita, S; Fujita, K; Pignatti, J

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY ( Palaeogeography, Palaeoclimatology, Palaeoecology ) 628 2023.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Constant shell density of hyaline large benthic foraminifers under thermal stress

Shunichi Kinoshita, Azumi Kuroyanagi, Hodaka Kawahata, Kazuhiko Fujita, Toyoho Ishimura, Atsushi Suzuki, Harumasa Kano, Yoshimi Kubota, Hiroshi Nishi

Marine Micropaleontology 181 2023.05 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Recently, increased concentrations of anthropogenic atmospheric CO2 have caused ocean warming and acidification, leading to swift environmental alterations. In coral reef regions, bleaching and death of symbiotic calcifying organisms have been distressing. Generally, large benthic foraminifers (LBF), a principal symbiotic calcifying organisms in coral reefs, have gained popularity because thermal stress impedes their growth and ecological functions. Nevertheless, due to the complex nature of the shell structure, it is unclear whether indicators (shell volume, density, and size) influence the calcification rate. Micro X-ray computed tomography (MicroCT) has been efficiently used to study these parameters on porcelaneous LBF; however, hyaline LBF remained largely unexplored. In this research, reproducing populations of LBF Calcarina gaudichaudii were grown asexually under six varying temperatures (19 °C–29 °C). They were then determined using MicroCT. Shell weight and volume is reduced under high and low thermal stress with an optimal water temperature of 26 °C. However, the density of the shell was sustained at a continual level. These outcomes indicate that C. gaudichaudii can sustain a continual shell density given circumstances of growth inhibition due to thermal stress.
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Books 【 display / non-display 】

Proceedings of the Integrated Ocean Drilling Program (IODP)

Webster J.M., Yokoyama Y., Cotterill C., the Expedition 325 Scientists (Fujita K.) ( Part: Multiple Authorship )

Integrated Ocean Drilling Program Management International, Inc., Tokyo 2011.08
Proceedings of the Integrated Ocean Drilling Program, Volume 310 Expedition Reports, Tahiti Sea Level

Camoin G. F., Iryu Y., McInroy D. B. and the IODP Expedition 310 Scientists (Fujita K.) ( Part: Multiple Authorship )

IODP Management International, Inc., Washington, DC 2007.04