Fujimura Hiroyuki

写真a

Title

Professor

Researcher Number(JSPS Kakenhi)

20398308
2
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Science   Chemistry, Biology and Marine Science   Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Chemistry, Biology and Marine Science   Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Marine and Environmental Sciences   Professor  

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External Career 【 display / non-display 】

  • 2004.10
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    2006.03

    University of the Ryukyus  

  • 2004.10
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    2006.03

    University of the Ryukyus, Faculty of Science, Postdoctoral fellow  

  • 2006.07
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    2009.06

    University of the Ryukyus  

  • 2006.07
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    2009.06

    University of the Ryukyus, Faculty of Science, Department of Chemistry, Biology, and Marine Science, Analytical and Inorganic Chemistry, Assistant Research  

  • 2009.07
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    2019.06

    University of the Ryukyus  

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Affiliated academic organizations 【 display / non-display 】

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    American Geophysical Union 

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    The Japanese-French Oceanographic Society 

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    The Japan Society for Analytical Chemistry 

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    The Geochemical Society of Japan 

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    Japanese Coral Reef Society 

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Research Interests 【 display / non-display 】

  • Biogeochemistry

  • Carbonate Chemistry

  • calcification

  • carbonate

  • antioxidative enzyme

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Research Areas 【 display / non-display 】

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

  • Nanotechnology/Materials / Analytical chemistry

  • Nanotechnology/Materials / Green sustainable chemistry and environmental chemistry

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Research Theme 【 display / non-display 】

  • Vertical profiles of carbonate system and ocean acidification in east chaina sea

  • Antioxidase activity of coral under heat stress condition

  • Chemical pollutants in costal area and the effects on coral

  • Carbon metabolisms of photosynthesis and calcification in coral reef

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Published Papers 【 display / non-display 】

  • Vegetation variety affected by local environments in a coral reef lagoon

    Kandai Tozaki, Gregory N. Nishihara, Azusa Kawate, Teruko Konishi, Yoichi Sato, Michihiro Ito, Hiroyuki Fujimura, Atsuko Tanaka

    Phycological Research ( Wiley )  72 ( 2 ) 112 - 122   2024.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    Abstract From shore to sea, coral reefs can generally be divided into a lagoon zone, a reef crest, and a fore reef. Environmental variables, such as nutrient fluxes, light availability, and water temperature, vary among the zones and influence the biodiversity of submerged macrophytes. Additionally, the biodiversity of vegetation within the lagoon appears to be affected by multiple and extremely localized conditions. We investigated the impact of small‐scale variations on vegetation diversity, and implemented an ecological survey within a well‐defined area inside of a lagoon at Bise Point, Okinawa, Japan. A total of 20 macroalgal species (four green algae, six brown algae, and ten red algae) and four seagrass species were identified from the surveyed quadrats over a period of 19 months, from October 2019 to March 2021. Patterns in species occurrence were spatially and temporally heterogeneous. Notably, water motion and sediment flux were highly variable among the monitoring sites. Redundancy analysis allowed us to evaluate the significance of environmental factors on the vegetation of each monitoring area. Six environmental factors were considered in this study, but their impacts on local vegetation were not equivalent. Redundancy analysis suggested that water depth, flow velocity, and the ratio of the small fraction of deposition particles were the three factors with the strongest influence on local vegetation. This study provides some crucial insights into the determinants of vegetation in a coral reef lagoon. Our findings suggest that the factors we examined exert more influence on the vegetation than seasonal effects.

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  • Nutrient uptake characteristics of Cladosiphon okamuranus (Phaeophyceae) from the Ryukyu Islands of Japan

    Yoichi Sato, Eri Inomata, Hikari Nagoe, Michihiro Ito, Teruko Konishi, Hiroyuki Fujimura, Atsuko Tanaka & Gregory N. Nishihara

    Journal of Applied Phycology ( Journal of Applied Phycology )  35 ( 1 ) 265 - 275   2023.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Correction: The Effect of Co-Culture of Two Coral Species on Their Bacterial Composition Under Captive Environments.

    Ide K, Nakano Y, Ito M, Nishikawa Y, Fujimura H, Takeyama H

    Marine biotechnology (New York, N.Y.) ( Marine Biotechnology )  24 ( 6 ) 1176 - 1176   2022.10 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • The Effect of Co-Culture of Two Coral Species on Their Bacterial Composition Under Captive Environments.

    Ide K, Nakano Y, Ito M, Nishikawa Y, Fujimura H, Takeyama H

    Marine biotechnology (New York, N.Y.) ( Marine Biotechnology )  24 ( 5 ) 871 - 881   2022.10 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    Coral symbionts are important members of the coral holobiont, and coral bacterial flora are essential in host health maintenance and coral conservation. Coral symbionts are affected by various environmental factors, such as seawater temperature, pH, and salinity. Although physicochemical and chemical factors have been highlighted as possible causes of these effects, the effects of water flow and the co-culture of different species corals have not been elucidated. In this study, we designed an artificial rearing environment to examine the impact of environmental and biological factors on Acropora tenuis, one of the major coral species in Okinawa, and Montipora digitata, during their co-culture. We intervened with the water flow to reveal that the movement of the rearing environment alters the bacterial flora of A. tenuis. During the rearing under captive environment, the alpha diversity of the coral microbiota increased, suggesting the establishment of rare bacteria from the ocean. No differences in the bacterial composition between the control and water flow groups were observed under the rearing conditions. However, the structure of the bacterial flora was significantly different in the co-culture group. Comparison of bacterial community succession strongly suggested that the differences observed were due to the suppressed transmission of bacteria from the ocean in the co-culture group. These results enhance our understanding of interactions between corals and shed light on the importance of regional differences and bacterial composition of coral flora.

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  • Long-term trends and seasonal variations in environmental conditions in Sesoko Island, Okinawa, Japan

    Singh Tanya, Sinniger Frederic, Nakano Yoshikatsu, Nakamura Shigeo, Kadena Shouhei, Jinza Mori, Fujimura Hiroyuki, Harii Saki

    Galaxea, Journal of Coral Reef Studies ( 日本サンゴ礁学会 )  24 ( 1 ) 121 - 133   2022.01 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    <p>Knowledge of environmental factors is crucial in understanding biological and ecological processes. Yet information on the environment around Sesoko Island, Okinawa, Japan, one of the main locations for coral reef research in Japan, remains scarce. Data of air and sea surface temperature (SST), wind velocity, wave height, and frequency of typhoons have been manually recorded at Sesoko Station, Tropical Biosphere Research Station, the University of the Ryukyus from September 1990 to November 2021. Here we describe the seasonal and long-term trends in these environmental variables at Sesoko Island. Some of the key findings were that the air temperature and SST fluctuated by ~9-12°C throughout the year. A rise in air temperature and SST between 1990 and 2021 was observed in the winter and autumn season, respectively. The Degree Heating Week (DHW) based on the in-situ data reflected the bleaching observations around Sesoko Station. The DHW exceeded the critical bleaching level of 8°C-week in 1998 and the significant bleaching level of 4°C-week in 2001, 2016, and 2017. Weak southerly winds were dominant in summers, while stronger northeasterly winds were dominant in winters. The frequency of winds between 3.4 to 7.9 m/s and northeastern winds have increased through time. Typhoons generally occur between May and October, and the frequency of typhoons has not increased over the past 30 years. Wave heights never exceeded 0.5 m and were highest between July and September. These findings will provide a reliable baseline of the environment at Sesoko Island for further ecological studies.</p>

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Presentations 【 display / non-display 】

  • Behavior of Aluminum and DOC in waters of the Gesashi mangrove estuary, Okinawa, Japan

    Kombo Mohamed, Bakari Said, Okada Koichiro, Fujimura Hiroyuki, Shinjo Ryuichi, Tokuyama Akira

    日本地球化学会年会要旨集  2005  -  2005 

    CiNii Research

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SDGs 【 display / non-display 】

  • サンゴの白化現象解明による白化防止およびサンゴの救済

  • サンゴ礁におけるマイクロプラスとチックの動態と造礁サンゴへの影響

  • 個人レベルによる再生可能エネルギー導入の可能性と実践

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