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• 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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• Can feeding be used for coral bleaching mitigation? Assessing the effect of using transcriptomics

  Yuyama, I; Yasuda, N; Higa, S; Yang, SY; Agostini, S; Higuchi, T; Miyajima, T; Nakamura, T; Furukawa, R; Mukaida, S; Fujimura, H

  BULLETIN OF MARINE SCIENCE   101 ( 1 )   2025.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

• Does coral community diversity increase microflora diversity and enhance environmental adaptation?

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

  BULLETIN OF MARINE SCIENCE   101 ( 1 )   2025.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

• Feeding effect on reducing reactive oxygen species in the scleractinian coral <i>Galaxea fascicularis</i>

  Higa Sayaka, Fujimura Hiroyuki, Higuchi Tomihiko, Miyajima Toshihiro, Yuyama Ikuko, Agostini Sylvain, Nakamura Takashi

  Galaxea, Journal of Coral Reef Studies ( 日本サンゴ礁学会 )  27 ( 1 ) 33 - 46   2025 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>Reactive oxygen species (ROS) are thought to be involved in the mechanism of coral bleaching caused by high water temperature. Corals able to acquire nutriments through heterotrophy are more resilient to bleaching. However, the detailed mechanism for the alleviation of coral bleaching is not known. Here, we investigated the effects of feeding on ROS production in the coral <i>Galaxea fascicularis</i> to evaluate its potential as a mitigation technique of coral bleaching. The culture experiment was conducted with <i>G. fascicularis</i> in a 2×2 factorial design with and without food, ambient water temperature (27°C), and high water temperature (32°C). <i>Artemia salina</i> was used as a food source. The results showed that SOD enzyme activity in coral and zooxanthellae increased significantly at higher water temperatures and feeding led to a decrease of this activity. This indicates that feeding can reduce ROS production, especially in the host tissue, and potentially lessen cellular damage during heat stress. However, bleaching was not completely alleviated by feeding with reduced zooxanthellae density, chlorophyll-<i>a</i> and zooxanthellae protein contents observed under high water temperatures. Moreover the addition of food also led to lower calcification rates, regardless of temperature. These findings highlight the potential of using food addition as a mitigation technique of coral bleaching but this will require further investigation on the long term effects of feeding to better understand the limitations of the technique.</p>

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• Chemistry on coral reefs: In memory of Dr. Tamotsu Oomori (1944–2022)

  Fujimura Hiroyuki, Toki Tomohiro

  Galaxea, Journal of Coral Reef Studies ( 日本サンゴ礁学会 )  27 ( 1 ) 30 - 32   2025

  Type of publication: Research paper (scientific journal)

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• Estimation of bubbled oxygen flux from a coral reef community

  Toki Tomohiro, Matayoshi Rie, Yamauchi Masataka, Koizumi Seiichi, Fujimura Hiroyuki

  Galaxea, Journal of Coral Reef Studies ( 日本サンゴ礁学会 )  27 ( 1 ) 47 - 61   2025 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>We collected bubbles from the seafloor of coral reef areas to determine their quantity and chemical composition. The chemical composition was high in oxygen and low in carbon dioxide compared to that of the atmosphere. Oxygen fluxes to the atmosphere from coral reef waters are generally determined considering only dissolved oxygen in seawater, but accounting for bubbled oxygen increased such fluxes by about 70%. At the same time, the primary production rate in coral reefs is estimated only from the dissolved oxygen concentration in seawater, but accounting for bubbled oxygen increased it by about 20–30%. The composition of bubbled gases suggests that approximately 20% of the oxygen present may be derived from photosynthesis in the reef area. Global quantitative estimation of bubbled oxygen fluxes in tropical and subtropical coral reef waters remains critical for future research.</p>

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• 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 

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Grant-in-Aid for Scientific Research 【 display / non-display 】

• Dynamics of microplastics on coral reefs and their impact on reef-building corals

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2024.04  -  2027.03 

  Investigator(s): Hiroyuki Fujimura 

  Direct: 3,500,000 (YEN)  Overheads: 4,550,000 (YEN)  Total: 1,050,000 (YEN)

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2015.04  -  2018.03 

  Direct: 3,700,000 (YEN)  Overheads: 1,110,000 (YEN)  Total: 4,810,000 (YEN)

• Grant-in-Aid for Scientific Research on Innovative Areas

  Project Year: 2008  -  2012 

• Grant-in-Aid for Scientific Research(B)

  Project Year: 2008  -  2011 

• Grant-in-Aid for Scientific Research(A)

  Project Year: 2007  -  2010 

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