Updated on 2025/12/19

写真a

 
INOUE Mayuri
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • PhD ( 2005.3   Tohoku University )

Education

  • Tohoku University   大学院理学研究科  

    2002.4 - 2005.3

  • Okayama University   大学院教育学研究科  

    2000.4 - 2002.3

  • Okayama University   教育学部  

    1996.4 - 2000.3

Professional Memberships

  • 日本地球環境史学会

  • 日本サンゴ礁学会

  • 日本地球化学会

  • 日本海洋学会

  • 日本第四紀学会

 

Papers

  • Transgenerational acclimation to acidified seawater and gene expression patterns in a sea urchin Reviewed

    Akira Iguchi, Kodai Gibu, Makiko Yorifuji, Miyuki Nishijima, Atsushi Suzuki, Tsuneo Ono, Yukio Matsumoto, Mayuri Inoue, Masahiko Fujii, Daisuke Muraoka, Yamato Fujita, Hideki Takami

    Science of The Total Environment   930   172616 - 172616   2024.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.scitotenv.2024.172616

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  • Assessment of chemical compositions in coral skeletons (Acropora digitifera and Porites australiensis) as temperature proxies Reviewed

    Shoko Sakata, Mayuri Inoue, Yasuaki Tanaka, Takashi Nakamura, Kazuhiko Sakai, Minoru Ikehara, Atsushi Suzuki

    Frontiers in Marine Science   11   2024.2

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

    Although biogenic carbonates, such as foraminifera and coccolithophorids, are valuable tools for reconstructing past environments, scleractinian corals also offer environmental data from tropical to subtropical regions with a higher time resolution. For example, oxygen isotopes (δ18O) and strontium-calcium (Sr/Ca) ratios have been utilized to reconstruct sea surface temperatures and salinity, primarily through the use of massive-type Porites sp. from the Pacific, as well as corals like Diploria and Montastrea from the Atlantic. While a few types of corals other than Porites have been utilized in paleoclimate studies, comprehensive evaluations of their geochemical tracers as temperature proxies have not been thoroughly conducted. Therefore, in this study, we focused on branching-type Acropora, which are found worldwide and are often present in fossil corals. We conducted a comparison of the chemical compositions (δ18O, δ13C, Sr/Ca, U/Ca, Mg/Ca, and Ba/Ca) of Acropora digitifera and Porites australiensis through temperature-controlled culture experiments. The validity of using the chemical components of A. digitifera as temperature proxies was then evaluated. Three colonies of A. digitifera and P. australiensis were collected for culture experiments on Sesoko Island, Okinawa, Japan. We reared coral samples in seawater with five different temperature settings (18, 21, 24, 27, 30°). The calcification rate and photosynthesis efficiency (Fv/Fm) of each nubbin were measured during the experimental period. After the culture experiment for 77 days, chemical components in skeletal parts grown during the experiment were then measured. Consequently, the mean growth rates and Fv/Fm throughout the experiment were higher for A. digitifera (0.22%/d and 0.63 for growth rate and Fv/Fm) compared to those for P. australiensis (0.11%/d and 0.38 for growth rate and Fv/Fm). This suggests that the higher efficiency of photosynthesis in A. digitifera would promote greater calcification compared to P. australiensis. Regarding the potential use as temperature proxies, A. digitifera exhibited a strong negative correlation, on average, between δ18O and the water temperature (r = 0.95, p< 0.001). The temperature dependency was found to be comparable to that reported in Porites corals (-0.11 and -0.17 ‰/°C for P. australiensis and A. digitifera, respectively). Thus, the δ18O of A. digitifera appeared to be a useful temperature proxy, although it was also slightly influenced by skeletal growth rate at the same temperature. A strong negative correlation was also observed between the mean Sr/Ca ratio and temperature in A. digitifera (r = 0.61, p< 0.001) as well as P. australiensis (r = 0.56, p< 0.001), without a clear influence from the skeletal growth rate. Therefore, the skeletal Sr/Ca ratio in corals may have been primarily influenced by water temperature, although large deviations in Sr/Ca were observed in A. digitifera, even at the same temperature settings. This deviation can be reduced by subsampling an apical part of a polyp including the axis of skeletal growth. The U/Ca ratio of A. digitifera appeared to be affected by internal pH variation within the corals, especially at 30°C. Similar to U/Ca ratios, metabolic and kinetic effects on corals were observed in δ13C of A. digitifera at 18 and 30°C. In addition, considering the variation pattern of both U/Ca and δ13C of A. digitifera at 30°C, it has been suggested that respirations may overwhelm photosynthesis for coral samples at 30°C. Therefore, the U/Ca and δ13C of A. digitifera could potentially be used as proxies of biomineralization processes, whereas the δ18O and Sr/Ca displayed a high possibility of acting as temperature proxies.

    DOI： 10.3389/fmars.2024.1329924

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  • Natural and Anthropogenic Climate Variability Signals in a 237-Year-Long Coral Record From the Philippines Reviewed

    M. Inoue, A. Fukushima, M. Chihara, A. Genda, M. Ikehara, T. Okai, H. Kawahata, F. P. Siringan, A. Suzuki

    Paleoceanography and Paleoclimatology   38 ( 11 )   2023.11

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2022PA004540

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  • Sea Surface Temperature and Salinity in Lombok Strait Reconstructed From Coral Sr/Ca and δ18O, 1962–2012 Reviewed

    Ai Genda, Minoru Ikehara, Atsushi Suzuki, Ali Arman, Mayuri Inoue

    Frontiers in Climate   4   2022.7

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media SA  

    Coral geochemical tracers have been used in studies of the paleoclimatology and paleoceanography of the tropics and subtropics. We measured Sr/Ca and oxygen isotope ratios (δ18O) in a coral sample collected from the southern part of Lombok Strait, a significant outlet of the Indonesian Throughflow (ITF) to the Indian Ocean, to reconstruct the historical record of sea surface temperature (SST) and seawater δ18O. Seawater δ18O can be used to approximate sea surface salinity (SSS) because it reflects the balance of evaporation and precipitation. The resulting time series reconstructed SST and SSS, covering the period 1962–2012, shows no clear trend of global warming, although the record includes a large cooling event (~4°C) during 1996–1997. Although neither SST nor SSS shows a systematic relationship with El Niño–Southern Oscillation and Indian Ocean Dipole (IOD), weak but significant correlations are found partly. In addition, the coral data show signals of major IOD and El Niño events in 1994 and 1997, respectively, although climatic trends recorded in the coral are not consistent with those found along the Java-Sumatra coast. To evaluate other influences on the ITF in Lombok Strait, we compared our coral record with coral records from sites in the Java Sea, the southern part of Makassar Strait, and Ombai Strait. During the northwest monsoon (December–January–February), variations in SST and SSS at Lombok Strait site are similar to those at the Java Sea and southern Makassar sites for the period 1962–1995, which suggests that low-salinity water from the Java Sea is carried at least to the southern part of Makassar Strait where it suppresses the ITF upstream from Lombok Strait. However, the SST and SSS records differ at the three sites during the southeast monsoon (June–July–August), indicating that surface conditions in Lombok Strait vary separately from those in the Java Sea. In the longer term, although global warming has been widely identified in the Indonesian Seas, the coral record shows no clear warming trend in the southern part of Lombok Strait, where fluctuations in the ITF may be modulating the distribution of heat in the surface waters of the western Pacific and eastern Indian Ocean.

    DOI： 10.3389/fclim.2022.918273

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  • Unique behavior of marine conditions in the Java Sea reconstructed from a 70 yr coral δ<sup>18</sup>O and Sr/Ca record from the Seribu Islands, Indonesia Reviewed

    Ai Genda, Minoru Ikehara, Atsushi Suzuki, Wahyoe S. Hantoro, Mayuri Inoue

    GEOCHEMICAL JOURNAL   56 ( 3 )   e1 - e7   2022

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Geochemical Society of Japan  

    DOI： 10.2343/geochemj.gj22007

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  • Whole-Genome Sequencing Highlights Conservative Genomic Strategies of a Stress-Tolerant, Long-Lived Scleractinian Coral, Porites australiensis Vaughan, 1918 Reviewed International journal

    Chuya Shinzato, Takeshi Takeuchi, Yuki Yoshioka, Ipputa Tada, Miyuki Kanda, Cédric Broussard, Akira Iguchi, Makoto Kusakabe, Frédéric Marin, Noriyuki Satoh, Mayuri Inoue

    Genome Biology and Evolution   13 ( 12 )   2021.12

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    <title>Abstract</title>
    Massive corals of the genus Porites, common, keystone reef builders in the Indo-Pacific Ocean, are distinguished by their relative stress tolerance and longevity. In order to identify genetic bases of these attributes, we sequenced the complete genome of a massive coral, Porites australiensis. We developed a genome assembly and gene models of comparable quality to those of other coral genomes. Proteome analysis identified 60 Porites skeletal matrix protein genes, all of which show significant similarities to genes from other corals and even to those from a sea anemone, which has no skeleton. Nonetheless, 30% of its skeletal matrix proteins were unique to Porites and were not present in the skeletons of other corals. Comparative genomic analyses showed that genes widely conserved among other organisms are selectively expanded in Porites. Specifically, comparisons of transcriptomic responses of P. australiensis and Acropora digitifera, a stress-sensitive coral, reveal significant differences in regard to genes that respond to increased water temperature, and some of the genes expanded exclusively in Porites may account for the different thermal tolerances of these corals. Taken together, widely shared genes may have given rise to unique biological characteristics of Porites, massive skeletons and stress tolerance.

    DOI： 10.1093/gbe/evab270

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    Other Link： https://academic.oup.com/gbe/article-pdf/13/12/evab270/41839460/evab270.pdf

  • Coral Record of Younger Dryas Chronozone Warmth on the Great Barrier Reef Reviewed

    Logan D. Brenner, Braddock K. Linsley, Jody M. Webster, Donald Potts, Thomas Felis, Michael K. Gagan, Mayuri Inoue, Helen McGregor, Atsushi Suzuki, Alexander Tudhope, Tezer Esat, Alex Thomas, William Thompson, Stewart Fallon, Marc Humblet, Manish Tiwari, Yusuke Yokoyama

    PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY   35 ( 12 )   2020.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2020PA003962

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  • Dataset of characteristic remanent magnetization and magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform)

    Luca Lanci, Elena Zanella, Luigi Jovane, Simone Galeotti, Montserrat Alonso-Garcia, Carlos A. Alvarez-Zarikian, Nagender Nath Bejugam, Christian Betzler, Or M. Bialik, Clara L. Blattler, Gregor P. Eberli, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Mayuri Inoue, Dick Kroon, Juan Carlos Laya, Anna Ling Hui Mee, Thomas Luedmann, Masatoshi Nakakuni, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, John J. G. Reijmer, Jesus Reolid, Angela L. Slagle, Craig R. Sloss, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young

    DATA IN BRIEF   27   2019.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.dib.2019.104666

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  • Magnetic properties of early Pliocene sediments from IODP Site U1467 (Maldives platform) reveal changes in the monsoon system Reviewed

    Luca Lanci, Elena Zanella, Luigi Jovane, Simone Galeotti, Montserrat Alonso-Garcia, Carlos A. Alvarez-Zarikian, Nagender Nath Bejugam, Christian Betzler, Or M. Bialik, Clara L. Blattler, Gregor P. Eberlik, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Mayuri Inoue, Dick Kroon, Juan Carlos Laya, Anna Ling Hui Mee, Thomas Luedmann, Masatoshi Nakakunir, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, John J. G. Reijmer, Jesus Reolid, Angela L. Slagle, Craig R. Sloss, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   533   2019.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.palaeo.2019.109283

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  • Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives Reviewed

    Peter K. Swart, Clara L. Blattler, Masatoshi Nakakuni, Greta J. Mackenzie, Christian Betzler, Gregor P. Eberli, Jesus Reolid, Montserrat Alonso-Garcia, Angela L. Slagle, James D. Wright, Dick Kroon, John J. G. Reijmer, Anna L. Hui Mee, Jeremy R. Young, Carlos A. Alvarez-Zarikian, Orr M. Bialik, Junhua Adam Guo, Sebastian Haffen, Senay Horozal, Mayuri Inoue, Luigi Jovane, Luca Lanci, Juan Carlos Laya, Thomas Luedmann, B. Nagender Nath, Kaoru Niino, Loren M. Petruny, Santi Dwi Pratiwi, Xiang Su, Craig R. Sloss, Zhengquan Yao

    EARTH AND PLANETARY SCIENCE LETTERS   521   1 - 13   2019.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.epsl.2019.05.019

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  • A two million year record of low-latitude aridity linked to continental weathering from the Maldives (vol 5, pg 86, 2018) Reviewed

    Tereza Kunkelova, Simon J. A. Jung, Erica S. de Leau, Nick Odling, Alex L. Thomas, Christian Betzler, Gregor P. Eberli, Carlos A. Alvarez-Zarikian, Montserrat Alonso-Garcia, Or M. Bialik, Clara L. Blattler, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Anna Ling Hui Mee, Mayuri Inoue, Luigi Jovane, Luca Lanci, Juan Carlos Laya, Thomas Luedmann, Nagender N. Bejugam, Masatoshi Nakakuni, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, John J. G. Reijmer, Jesus Reolid, Angela L. Slagle, Craig R. Sloss, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young, Sebastian Lindhorst, Stephanie Stainbank, Andres Rueggeberg, Silvia Spezzaferri, Igor Carrasqueira, Siyao Yu, Dick Kroon

    PROGRESS IN EARTH AND PLANETARY SCIENCE   6   2019.2

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  • Perspective on the response of marine calcifiers to global warming and ocean acidification-Behavior of corals and foraminifera in a high CO2 world "hot house" Reviewed

    Hodaka Kawahata, Kazuhiko Fujita, Akira Iguchi, Mayuri Inoue, Shinya Iwasaki, Azumi Kuroyanagi, Ayumi Maeda, Takuya Manaka, Kazuyoshi Moriya, Haruka Takagi, Takashi Toyofuku, Toshihiro Yoshimura, Atsushi Suzuki

    PROGRESS IN EARTH AND PLANETARY SCIENCE   6   2019.1

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  • Corrigendum to “Carbonate delta drift: A new sediment drift type” [Mar. Geol. 401 (2018) 98–111] (Marine Geology (2018) 401 (98–111), (S0025322717302761) (10.1016/j.margeo.2018.04.011))

    Thomas Lüdmann, Christian Betzler, Gregor P. Eberli, Jesús Reolid, John J.G. Reijmer, Craig R. Sloss, Or M. Bialik, Carlos A. Alvarez-Zarikian, Montserrat Alonso-García, Clara L. Blättler, Junhua Adam Guo, Sébastien Haffen, Senay Horozal, Mayuri Inoue, Luigi Jovane, Dick Kroon, Luca Lanci, Juan Carlos Laya, Anna Ling Hui Mee, Masatoshi Nakakuni, B. Nagender Nath, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, Angela L. Slagle, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young

    Marine Geology   406   214 - 215   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier B.V.  

    DOI： 10.1016/j.margeo.2018.10.005

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  • A two million year record of low-latitude aridity linked to continental weathering from the Maldives

    Tereza Kunkelova, Simon J. A. Jung, Erica S. de Leau, Nick Odling, Alex L. Thomas, Christian Betzler, Gregor P. Eberli, Carlos A. Alvarez-Zarikian, Montserrat Alonso-Garcia, Or M. Bialik, Clara L. Blattler, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Anna Ling Hui Mee, Mayuri Inoue, Luigi Jovane, Luca Lanci, Juan Carlos Laya, Thomas Luedmann, Nagender N. Bejugam, Masatoshi Nakakuni, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, John J. G. Reijmer, Jesus Reolid, Angela L. Slagle, Craig R. Sloss, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young, Sebastian Lindhorst, Stephanie Stainbank, Andres Rueggeberg, Silvia Spezzaferri, Igor Carrasqueira, Siyao Hu, Dick Kroon

    PROGRESS IN EARTH AND PLANETARY SCIENCE   5   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1186/s40645-018-0238-x

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  • A simple role of coral-algal symbiosis in coral calcification based on multiple geochemical tracers

    Mayuri Inoue, Takashi Nakamura, Yasuaki Tanaka, Atsushi Suzuki, Yusuke Yokoyama, Hodaka Kawahata, Kazuhiko Sakai, Nikolaus Gussone

    GEOCHIMICA ET COSMOCHIMICA ACTA   235   76 - 88   2018.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2018.05.016

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  • Carbonate delta drift: A new sediment drift type

    Thomas Luedmann, Christian Betzler, Gregor P. Eberli, Jesus Reolid, John J. G. Reijmer, Craig R. Sloss, Or M. Bialik, Carlos A. Alvarez-Zarikian, Montserrat Alonso-Garcia, Clara L. Blaettler, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Mayuri Inoue, Luigi Jovane, Dick Kroon, Luca Lanci, Juan Carlos Laya, Anna Ling Hui Mee, Masatoshi Nakakuni, B. Nagender Nath, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, Angela L. Slagle, Xiang Su, Peter K. Swart, James D. Wright, Zhengquan Yao, Jeremy R. Young

    MARINE GEOLOGY   401   98 - 111   2018.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.margeo.2018.04.011

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  • Refinement of Miocene sea level and monsoon events from the sedimentary archive of the Maldives (Indian Ocean)

    C. Betzler, G. P. Eberli, T. Luedmann, J. Reolid, D. Kroon, J. J. G. Reijmer, P. K. Swart, J. Wright, J. R. Young, C. Alvarez-Zarikian, M. Alonso-Garcia, O. M. Bialik, C. L. Blattler, J. A. Guo, S. Haffen, S. Horozal, M. Inoue, L. Jovane, L. Lanci, J. C. Laya, A. L. Hui Mee, M. Nakakuni, B. N. Nath, K. Niino, L. M. Petruny, S. D. Pratiwi, A. L. Slagle, C. R. Sloss, X. Su, Z. Yao

    PROGRESS IN EARTH AND PLANETARY SCIENCE   5   2018.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1186/s40645-018-0165-x

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  • 多元素・同位体分析に基づく造礁サンゴの骨格成長における褐虫藻の役割 Reviewed

    井上 麻夕里, 中村 崇, 田中 泰章, 鈴木 淳, 横山 祐典, 川幡 穂高, 酒井 一彦, Nikolaus Gussone

    日本地球化学会年会要旨集   65   2018

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人日本地球化学会  

    <p>本研究ではサンゴの骨格成長における褐虫藻の役割を明らかにするために、褐虫藻有りと無しのポリプ試料を作成し、温度、塩分、pCO2を調整した水槽で飼育した。飼育実験の後、ポリプ骨格について6種類の化学成分を分析した。その結果、海水のpH指標とされているU/Ca比についてのみ、褐虫藻有りと無しの間に有意な差が見られた。これは、褐虫藻有りのサンゴ体内のpHが上昇していることを示しており、これにより褐虫藻と共生関係にあるサンゴは骨格成長が早いことが分かった。</p>

    DOI： 10.14862/geochemproc.65.0_23

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  • Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years

    Yuki Ota, Hodaka Kawahata, Masafumi Murayama, Mayuri Inoue, Yusuke Yokoyama, Yosuke Miyairi, Thura Aung, H. M. Zakir Hossain, Atsushi Suzuki, Akihisa Kitamura, Kyaw Thu Moe

    JOURNAL OF QUATERNARY SCIENCE   32 ( 4 )   528 - 539   2017.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/jqs.2947

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  • An aposymbiotic primary coral polyp counteracts acidification by active pH regulation

    Yoshikazu Ohno, Akira Iguchi, Chuya Shinzato, Mayuri Inoue, Atsushi Suzuki, Kazuhiko Sakai, Takashi Nakamura

    SCIENTIFIC REPORTS   7   2017.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep40324

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  • Calcification process dynamics in coral primary polyps as observed using a calcein incubation method Reviewed International journal

    Ohno, Yoshikazu, Iguchi, Akira, Shinzato, Chuya, Gushi, Mikako, Inoue, Mayuri, Suzuki, Atsushi, Sakai, Kazuhiko, Nakamura, Takashi

    Biochemistry and biophysics reports   9   289 - 294   2017

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

    Calcification processes are largely unknown in scleractinian corals. In this study, live confocal imaging was used to elucidate the spatiotemporal dynamics of the calcification process in aposymbiotic primary polyps of the coral species Acropora digitifera. The fluorophore calcein was used as a calcium deposition marker and a visible indicator of extracellular fluid distribution at the tissue-skeleton interface (subcalicoblastic medium, SCM) in primary polyp tissues. Under continuous incubation in calcein-containing seawater, initial crystallization and skeletal growth were visualized among the calicoblastic cells in live primary polyp tissues. Additionally, the distribution of calcein-stained SCM and contraction movements of the pockets of SCM were captured at intervals of a few minutes. Our experimental system provided several new insights into coral calcification, particularly as a first step in monitoring the relationship between cellular dynamics and calcification in vivo. Our study suggests that coral calcification initiates at intercellular spaces, a finding that may contribute to the general understanding of coral calcification processes.

    DOI： 10.1016/j.bbrep.2017.01.006

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    Other Link： http://orcid.org/0000-0002-8894-1977

  • The role of symbiotic algae in the formation of the coral polyp skeleton: 3-D morphological study based on X-ray microcomputed tomography

    Shinya Iwasaki, Mayuri Inoue, Atsushi Suzuki, Osamu Sasaki, Harumasa Kano, Akira Iguchi, Kazuhiko Sakai, Hodaka Kawahata

    GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   17 ( 9 )   3629 - 3637   2016.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/2016GC006536

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  • The abrupt onset of the modern South Asian Monsoon winds

    Christian Betzler, Gregor P. Eberli, Dick Kroon, James D. Wright, Peter K. Swart, Bejugam Nagender Nath, Carlos A. Alvarez-Zarikian, Montserrat Alonso-Garcia, Or M. Bialik, Clara L. Blattler, Junhua Adam Guo, Sebastien Haffen, Senay Horozal, Mayuri Inoue, Luigi Jovane, Luca Lanci, Juan Carlos Laya, Anna Ling Hui Mee, Thomas Luedmann, Masatoshi Nakakuni, Kaoru Niino, Loren M. Petruny, Santi D. Pratiwi, John J. G. Reijmer, Jesus Reolid, Angela L. Slagle, Craig R. Sloss, Xiang Su, Zhengquan Yao, Jeremy R. Young

    SCIENTIFIC REPORTS   6   2016.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep29838

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  • Intensification of the meridional temperature gradient in the Great Barrier Reef following the Last Glacial Maximum (vol 5, 4102, 2014) Reviewed

    Thomas Felis, Helen V. McGregor, Braddock K. Linsley, Alexander W. Tudhope, Michael K. Gagan, Atsushi Suzuki, Mayuri Inoue, Alexander L. Thomas, Tezer M. Esat, William G. Thompson, Manish Tiwari, Donald C. Potts, Manfred Mudelsee, Yusuke Yokoyama, Jody M. Webster

    NATURE COMMUNICATIONS   7   2016.6

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  • Controlling factors of Ca isotope fractionation in scleractinian corals evaluated by temperature, pH and light controlled culture experiments

    Mayuri Inoue, Nikolaus Gussone, Yasuko Koga, Akihiro Iwase, Atsushi Suzuki, Kazuhiko Sakai, Hodaka Kawahata

    GEOCHIMICA ET COSMOCHIMICA ACTA   167   80 - 92   2015.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gca.2015.06.009

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  • Nutrient availability affects the response of juvenile corals and the endosymbionts to ocean acidification

    Yasuaki Tanaka, Akira Iguchi, Kozue Nishida, Mayuri Inoue, Takashi Nakamura, Atsushi Suzuki, Kazuhiko Sakai

    LIMNOLOGY AND OCEANOGRAPHY   59 ( 5 )   1468 - 1476   2014.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.4319/lo.2014.59.5.1468

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  • Loss of zooxanthellae in a coral under high seawater temperature and nutrient enrichment

    Yasuald Tanaka, Mayuri Inoue, Takashi Nakamura, Atsushi Suzuki, Kazuhiko Sakai

    JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY   457   220 - 225   2014.8

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    DOI： 10.1016/j.jembe.2014.04.019

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  • Skeletal oxygen and carbon isotope compositions of Acropora coral primary polyps experimentally cultured at different temperatures

    Kozue Nishida, Kei Ishikawa, Akira Iguchi, Yasuaki Tanaka, Mizuho Sato, Toyoho Ishimura, Mayuri Inoue, Takashi Nakamura, Kazuhiko Sakai, Atsushi Suzuki

    GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   15 ( 7 )   2840 - 2849   2014.7

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    DOI： 10.1002/2014GC005322

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  • Intensification of the meridional temperature gradient in the Great Barrier Reef following the Last Glacial Maximum

    Thomas Felis, Helen V. McGregor, Braddock K. Linsley, Alexander W. Tudhope, Michael K. Gagan, Atsushi Suzuki, Mayuri Inoue, Alexander L. Thomas, Tezer M. Esat, William G. Thompson, Manish Tiwari, Donald C. Potts, Manfred Mudelsee, Yusuke Yokoyama, Jody M. Webster

    NATURE COMMUNICATIONS   5   2014.6

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    DOI： 10.1038/ncomms5102

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  • Evaluation of Mn and Fe in coral skeletons (Porites spp.) as proxies for sediment loading and reconstruction of 50 yrs of land use on Ishigaki Island, Japan

    Mayuri Inoue, Daisaku Ishikawa, Tsuzumi Miyaji, Atsuko Yamazaki, Atsushi Suzuki, Hiroya Yamano, Hodaka Kawahata, Tsuyoshi Watanabe

    CORAL REEFS   33 ( 2 )   363 - 373   2014.6

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    DOI： 10.1007/s00338-014-1128-3

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  • A Snapshot of a Coral "Holobiont": A Transcriptome Assembly of the Scleractinian Coral, Porites, Captures a Wide Variety of Genes from Both the Host and Symbiotic Zooxanthellae

    Chuya Shinzato, Mayuri Inoue, Makoto Kusakabe

    PLOS ONE   9 ( 1 )   2014.1

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    DOI： 10.1371/journal.pone.0085182

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  • Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements

    Ed C. Hathorne, Alex Gagnon, Thomas Felis, Jess Adkins, Ryuji Asami, Wim Boer, Nicolas Caillon, David Case, Kim M. Cobb, Eric Douville, Peter deMenocal, Anton Eisenhauer, Dieter Garbe-Schoenberg, Walter Geibert, Steven Goldstein, Konrad Hughen, Mayuri Inoue, Hodaka Kawahata, Martin Koelling, Florence L. Cornec, Braddock K. Linsley, Helen V. McGregor, Paolo Montagna, Intan S. Nurhati, Terrence M. Quinn, Jacek Raddatz, Helene Rebaubier, Laura F. Robinson, Aleksey Sadekov, Rob Sherrell, Dan Sinclair, Alexander W. Tudhope, Gangjian Wei, Henri Wong, Henry C. Wu, Chen-Feng You

    GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   14 ( 9 )   3730 - 3750   2013.9

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    DOI： 10.1002/ggge.20230

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  • Symbiosis increases coral tolerance to ocean acidification

    S. Ohki, T. Irie, M. Inoue, K. Shinmen, H. Kawahata, T. Nakamura, A. Kato, Y. Nojiri, A. Suzuki, K. Sakai, R. van Woesik

    2013.4

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    Abstract. Increasing the acidity of ocean waters will directly threaten calcifying marine organisms such as reef-building scleractinian corals, and the myriad of species that rely on corals for protection and sustenance. Ocean pH has already decreased by around 0.1 pH units since the beginning of the industrial revolution, and is expected to decrease by another 0.2–0.4 pH units by 2100. This study mimicked the pre-industrial, present, and near-future levels of pCO2 using a precise control system (&amp;amp;pm;5% pCO2), to assess the impact of ocean acidification on the calcification of recently-settled primary polyps of Acropora digitifera, both with and without symbionts, and adult fragments with symbionts. The increase in pCO2 of 100 μatm between the pre-industrial period and the present had more effect on the calcification rate of adult A. digitifera than the anticipated future increases of several hundreds of micro-atmospheres of pCO2. The primary polyps with symbionts showed higher calcification rates than primary polyps without symbionts, suggesting that (i) primary polyps housing symbionts are more tolerant to near-future ocean acidification than organisms without symbionts, and (ii) corals acquiring symbionts from the environment (i.e. broadcasting species) will be more vulnerable to ocean acidification than corals that maternally acquire symbionts.

    DOI： 10.5194/bgd-10-7013-2013

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  • Microscopic observation of symbiotic and aposymbiotic juvenile corals in nutrient-enriched seawater

    Yasuaki Tanaka, Akira Iguchi, Mayuri Inoue, Chiharu Mori, Kazuhiko Sakai, Atsushi Suzuki, Hodaka Kawahata, Takashi Nakamura

    MARINE POLLUTION BULLETIN   68 ( 1-2 )   93 - 98   2013.3

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    DOI： 10.1016/j.marpolbul.2012.12.017

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  • Growth-rate influences on coral climate proxies tested by a multiple colony culture experiment

    Erika Hayashi, Atsushi Suzuki, Takashi Nakamura, Akihiro Iwase, Toyoho Ishimura, Akira Iguchi, Kazuhiko Sakai, Takashi Okai, Mayuri Inoue, Daisuke Araoka, Shohei Murayama, Hodaka Kawahata

    EARTH AND PLANETARY SCIENCE LETTERS   362   198 - 206   2013.1

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    DOI： 10.1016/j.epsl.2012.11.046

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  • Calcification responses of symbiotic and aposymbiotic corals to near-future levels of ocean acidification Reviewed

    Ohki S, Irie T, Inoue M, Shinmen K, Kawahata H, Nakamura T, Kato A, Nojiri Y, Suzuki A, Sakai K, van Woesik R

    BIOGEOSCIENCES   10 ( 11 )   6807 - 6814   2013

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  • Estimate of calcification responses to thermal and freshening stresses based on culture experiments with symbiotic and aposymbiotic primary polyps of a coral, Acropora digitifera

    Mayuri Inoue, Kotaro Shinmen, Hodaka Kawahata, Takashi Nakamura, Yasuaki Tanaka, Aki Kato, Chuya Shinzato, Akira Iguchi, Hironobu Kan, Atsushi Suzuki, Kazuhiko Sakai

    GLOBAL AND PLANETARY CHANGE   92-93   1 - 7   2012.7

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    DOI： 10.1016/j.gloplacha.2012.05.001

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  • Effects of acidified seawater on coral calcification and symbiotic algae on the massive coral Porites australiensis

    Akira Iguchi, Saori Ozaki, Takashi Nakamura, Mayuri Inoue, Yasuaki Tanaka, Atsushi Suzuki, Hodaka Kawahata, Kazuhiko Sakai

    MARINE ENVIRONMENTAL RESEARCH   73   32 - 36   2012.2

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    DOI： 10.1016/j.marenvres.2011.10.008

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  • Mg isotope fractionation in biogenic carbonates of deep-sea coral, benthic foraminifera, and hermatypic coral

    Toshihiro Yoshimura, Masaharu Tanimizu, Mayuri Inoue, Atsushi Suzuki, Nozomu Iwasaki, Hodaka Kawahata

    ANALYTICAL AND BIOANALYTICAL CHEMISTRY   401 ( 9 )   2755 - 2769   2011.11

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    DOI： 10.1007/s00216-011-5264-0

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  • Effects of seawater pH on growth and skeletal U/Ca ratios of Acropora digitifera coral polyps

    Mayuri Inoue, Ryota Suwa, Atsushi Suzuki, Kazuhiko Sakai, Hodaka Kawahata

    GEOPHYSICAL RESEARCH LETTERS   38   2011.6

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    DOI： 10.1029/2011GL047786

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  • Abrupt shift toward cooler condition in the earliest 20th century detected in a 165 year coral record from Ishigaki Island, southwestern Japan

    Mari Mishima, Atsushi Suzuki, Masayuki Nagao, Toyoho Ishimura, Mayuri Inoue, Hodaka Kawahata

    GEOPHYSICAL RESEARCH LETTERS   37   2010.8

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    DOI： 10.1029/2010GL043451

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  • Enhanced riverine carbon flux from carbonate catchment to the ocean: A comparative hydrogeochemical study on Ishigaki and Iriomote islands, southwestern Japan

    Hiroyuki Ushie, Hodaka Kawahata, Atsushi Suzuki, Shohei Murayama, Mayuri Inoue

    JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES   115   2010.6

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    DOI： 10.1029/2009JG001039

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  • Historic 1771 Meiwa tsunami confirmed by high-resolution U/Th dating of massive Porites coral boulders at Ishigaki Island in the Ryukyus, Japan

    Daisuke Araoka, Mayuri Inoue, Atsushi Suzuki, Yusuke Yokoyama, R. Lawrence Edwards, Hai Cheng, Hiroyuki Matsuzaki, Hironobu Kan, Naotatsu Shikazono, Hodaka Kawahata

    GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   11   2010.6

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    DOI： 10.1029/2009GC002893

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  • Trace element variations in fossil corals from Tahiti collected by IODP Expedition 310: Reconstruction of marine environments during the last deglaciation (15 to 9 ka)

    Mayuri Inoue, Yusuke Yokoyama, Mariko Harada, Atsushi Suzuki, Hodaka Kawahata, Hiroyuki Matsuzaki, Yasufumi Iryu

    MARINE GEOLOGY   271 ( 3-4 )   303 - 306   2010.6

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    DOI： 10.1016/j.margeo.2010.02.016

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  • Reconstruction of the East China Sea palaeoenvironment at 16 ka by comparison of fossil and modern Faviidae corals from the Ryukyus, southwestern Japan

    Mari Mishima, Hodaka Kawahata, Atsushi Suzuki, Mayuri Inoue, Takashi Okai, Akio Omura

    JOURNAL OF QUATERNARY SCIENCE   24 ( 8 )   928 - 936   2009.12

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    DOI： 10.1002/jqs.1268

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  • Anthropogenic lead inputs to the western Pacific during the 20th century

    Mayuri Inoue, Masaharu Tanimizu

    SCIENCE OF THE TOTAL ENVIRONMENT   406 ( 1-2 )   123 - 130   2008.11

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    DOI： 10.1016/j.scitotenv.2008.07.032

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  • Empirical assessment of coral Sr/Ca and Mg/Ca ratios as climate proxies using colonies grown at different temperatures

    Mayuri Inoue, Atsushi Suzuki, Masato Nohara, Kohei Hibino, Hodaka Kawahata

    GEOPHYSICAL RESEARCH LETTERS   34 ( 12 )   2007.6

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    DOI： 10.1029/2007GL029628

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  • Distribution and temporal changes of lead in the surface seawater in the western Pacific and adjacent seas derived from coral skeletons

    Mayuri Inoue, Akiko Hata, Atsushi Suzuki, Masato Nohara, Naotatsu Shikazono, Wyss W. -S. Yim, Wahyoe S. Hantoro, Sun Donghuai, Hodaka Kawahata

    ENVIRONMENTAL POLLUTION   144 ( 3 )   1045 - 1052   2006.12

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    DOI： 10.1016/j.envpol.2005.11.048

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  • Stable isotope and chemical composition of pearls: Biomineralization in cultured pearl oysters in Ago Bay, Japan

    Hodaka Kawahata, Mayuri Inoue, Masato Nohara, Atsushi Suzuki

    JOURNAL OF OCEANOGRAPHY   62 ( 4 )   405 - 412   2006.8

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    DOI： 10.1007/s10872-006-0064-4

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  • Temperature-related influences on multiple coral climate proxies: an assessment using a tank experiment

    Inoue Mayuri, Suzuki Atsushi, Nohara Masato, Hibino Kohei, Kawahata Hodaka

    Abstracts of Annual Meeting of the Geochemical Society of Japan   52   199 - 199   2005

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    Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

    DOI： 10.14862/geochemproc.52.0.199.0

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  • Coral skeletal tin and copper concentrations at Pohnpei, Micronesia: possible index for marine pollution by toxic anti-biofouling paints

    M Inoue, A Suzuki, M Nohara, H Kan, A Edward, H Kawahata

    ENVIRONMENTAL POLLUTION   129 ( 3 )   399 - 407   2004.6

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    DOI： 10.1016/j.envpol.2003.11.009

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  • Endocrine disrupter nonylphenol and bisphenol A contamination in Okinawa and Ishigaki Islands, Japan - within coral reefs and adjacent river mouths

    H Kawahata, H Ohta, M Inoue, A Suzuki

    CHEMOSPHERE   55 ( 11 )   1519 - 1527   2004.6

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    DOI： 10.1016/j.chemosphere.2004.01.032

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  • Concentrations of trace elements in carbonate reference materials coral JCp-1 and giant clam JCt-1 by inductively coupled plasma-mass spectrometry

    M Inoue, M Nohara, T Okai, A Suzuki, H Kawahata

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   28 ( 3 )   411 - 416   2004

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    DOI： 10.1111/j.1751-908X.2004.tb00759.x

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  • A review of the marine calcium cycle and stable isotope tracers in geoscience studies

    吉村寿紘, 井上麻夕里

    海の研究   25 ( 3 )   81‐99 - 99   2016

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  • Studies and current issues on the reconstruction of paleo-environments based on trace elements of coral skeletons

    INOUE Mayuri, Mayuri Inoue, Atmosphere and Ocean Research Institute The University of Tokyo

    Oceanography in Japan   21 ( 5 )   159 - 175   2012.9

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    <p>Elevated CO<sub>2 </sub>caused by human activities is thought as a cause of future climate change driving global warming and ocean acidification. In order to predict global environments in the near future, it is required to understand the past environmental change and its process in detail. While it is well known that biogenic carbonates such as foraminifera and coccolithophorid are attractive tools to reconstruct the past environments, scleractinian corals also provide environmental data around tropical to subtropical region with much higher time resolution. In this review, I summarize previous works on paleo-environments based on chemical components of fossil and modern coral skeletons in order of the age from Pliocene to the present. Then recent studies concerning elemental variability in micro scales of skeletal surfaces and current issues accompanying with new findings from these studies are discussed. I hope that this review will inspire further study in this field.</p><p></p>

    DOI： 10.5928/kaiyou.21.5_159

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  • Coral calcification and its response to global environmental changes

    SUZUKI Atsushi, INOUE Mayuri, Atsushi Suzuki, Mayuri Inoue, Atmosphere and Ocean Research Institute The University of Tokyo

    Oceanography in Japan   21 ( 5 )   177 - 188   2012.9

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    <p>Calcification mechanism of reef-building corals and its response to global environmental changes are reviewed based on the recently published literature. Coral calcification is an extracellular reaction occurred in subcalicoblastic extracellular calcifying medium. To maintain progress of calcification, calcium ions and dissolved inorganic carbon species are needed to be supplied in the calcifying medium while calcification inhibitors such as protons should be removed efficiently. Catalytic reaction of carbonic anhydrase in calicoblastic endoderm layers seems to play important role for fast calcification of corals. Better understanding on coral calcification is essential to evaluate on-going ocean acidification impact on reef calcification. More integrated research strategy is required including physiology, skeletal geochemistry, and molecular biology.</p>

    DOI： 10.5928/kaiyou.21.5_177

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  • Changes of global environments and reef building corals (Reprint)

    INOUE Mayuri, M. Inoue

    Oceanography in Japan   21 ( 5 )   145 - 146   2012.9

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    Language：Japanese   Publisher：The Oceanographic Society of Japan  

    DOI： 10.5928/kaiyou.21.5_145

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  • A review of the influence of ocean acidification on marine organisms in coral reefs

    SUWA Ryota, NAKAMURA Takashi, IGUCHI Akira, NAKAMURA Masako, MORITA Masaya, KATO Aki, FUJITA Kazuhiko, INOUE Mayuri, SAKAI Kazuhiko, SUZUKI Atsushi, KOIKE Isao, SIRAYAMA Yoshihisa, NOJIRI Yukihiro, Ryota Suwa, Takashi Nakamura, Akira Iguchi, Masako Nakamura, Masaya Morita, Aki Kato, Kazuhiko Fujita, Mayuri Inoue, Kazuhiko Sakai, Atsushi Suzuki, Isao Koike, Yoshihisa Sirayama, Yukihiro Nojiri, Seto Marine Biological Laboratory Field Science Education and Research Center Kyoto University, Amakusa Marine Laboratory Kyusyu University, Sesoko Station Tropical Biosphere Research Center University of the Ryukyus, Sesoko Station Tropical Biosphere Research Center University of the Ryukyus, Sesoko Station Tropical Biosphere Research Center University of the Ryukyus, Graduate School of Engineering and Science University of the Ryukyus, Graduate School of Engineering and Science University of the Ryukyus, Ocean Research Institute The University of Tokyo, Sesoko Station Tropical Biosphere Research Center University of the Ryukyus, Geological Survey of Japan National Institute of Advanced Industrial Science and Technology(AIST), Seto Marine Biological Laboratory Field Science Education and Research Center Kyoto University, Center for Global Environmental Research National Institute for Environmental Studies

    Oceanography in Japan   19 ( 1 )   21 - 40   2010.1

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  • Variation of trace elements in coral skeleton based on culture experiments

    Chikyu Monthly   ( 59 )   12 - 17   2008

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  • Oxygen and carbon isotope ratios of hermatypic corals

    Chishitsu news   ( 632 )   23 - 28   2007.4

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  • Re-evaluation of Sr/Ca ratio in coral skeletons as a proxy for temperature

    INOUE Mayuri

    Chikyukagaku   40 ( 3 )   209 - 219   2006

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    Language：Japanese   Publisher：The Geochemical Society of Japan  

    Components in biogenic carbonates have been recognized to be attractive tools for reconstructing past oceanographic and climatic changes. Although chemical components in coral aragonite are precipitated away from equilibrium, fluctuations of Sr/Ca ratio in coral skeletons have been empirically considered to be controlled by temperature. Thus, Sr/Ca ratio in coral skeletons has been applied for paleoclimate reconstruction. Recently, coupled measurements of coral skeletal δ<sup>18</sup>O, indicator of both SST and seawater δ<sup>18</sup>O, and Sr/Ca ratio are used to reconstruct seawater salinity as well as SST. On the other hand, it has been reported that Sr/Ca is also affected by growth rate of coral skeleton besides SST. However, the impact of skeletal growth rate on Sr/Ca ratio is a matter of debate and controversial results have been reported at the present. In this review, recent progress of studies on the topics and a mechanism of growth rate-related Sr/Ca variation based on a physiological model are summarized.

    DOI： 10.14934/chikyukagaku.40.209

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  • 危険化学物質による環境汚染(その3)ミクロネシア連邦ポンペイ島における船底塗料による海洋汚染の歴史的変遷--サンゴ骨格中の銅とスズを指標として

    鈴木 淳, 井上 麻夕里, 野原 昌人

    地質ニュース   ( 604 )   8 - 14   2004.12

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  • 危険化学物質による環境汚染(その2)琉球列島サンゴ礁および隣接地域の外因性内分泌攪乱物質(環境ホルモン)ノニルフェノールとビスフェノールAの汚染

    川幡 穂高, 井上 麻夕里, 北田 幸男

    地質ニュース   ( 603 )   20 - 24   2004.11

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  • Collaborative analysis of GSJ/AIST geochemical reference materials JCp-1 (Coral) and JCt-1 (Giant Clam)

    OKAI Takashi, SUZUKI Atsushi, TERASHIMA Shigeru, INOUE Mayuri, NOHARA Masato, KAWAHATA Hodaka, IMAI Noboru

    Chikyukagaku   38 ( 4 )   281 - 286   2004

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    Language：Japanese   Publisher：The Geochemical Society of Japan  

    The chemical composition of coral skeleton and clamshell is closely linked to the composition of surface sea water in which skeletal or shell calcium carbonate is precipitated. For this reason, several chemical components in coral and clam have been determined to be indicatrs of sea surface environmental conditions. However, there is no reference material having the same chemical composition as coral or clam. Therefore, GSJ/AIST has issued the reference materials JCp-1 (Coral <i>Porites</i> sp.) and JCt-1 (Giant Clam <i>Tridacna</i>), for the determination and evaluation of elements in coral, clam and other biogenic carbonates. In this study, collaborative analysis for the certification of reference materials JCp-1 and JCt-1 was carried out in ten laboratories. The analytical data were compiled for 9 components (CaO, Ba, Fe, K, Mg, Mn, Na, P and Sr). The ICP-AES and AAS were mainly used, and the analytical results agreed relatively well. In the statistical analysis, the reference values were mainly decided using the robust method. ISO typically recommends that data should be submitted from no fewer than 15 laboratories for deciding the certified values; the reference values given in this paper could be considered as preliminary certified values.

    DOI： 10.14934/chikyukagaku.38.281

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  • Relationship between sediments and water turbidity in coral reefs around Ishigaki Island, the Ryukyus

    Tottori K., Suzuki A., Nagao M., Morimoto N., Inoue M., Iwase A., Shibuno T., Fujioka Y., Ohba H., Kan H.

    Journal of the Japanese Coral Reef Society   2004 ( 6 )   1 - 19   2004

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    Publisher：The Japanese Coral Reef Society  

    The distributions of sediments and its relation to reef water turbidities were investigated in three fringing reefs along the east coast of Ishigaki Island and a patch reef named &ldquo;Shimobishi&rdquo; in the lagoon of Sekisei Reef. In order to quantify fine particles in sediments, we employed &ldquo;SPSS (content of suspended particles in sea sediments)&rdquo; method, which was originally proposed by Ohmija (1987) for quick assessment of land-derived soil distribution in reef sediments. We found highest SPSS values in a moat and channel bottom of the Miyara Bay and along the northern coast of the Todoroki River mouth in Ishigaki Island. In contrast, SPSS values were low in other three reefs including Yasurazaki, Shiraho and Shimobishi areas. Reef water turbidities showed significant correlation with SPSS values, which suggests that the major cause of reef water turbidities is resuspension of fine particles in the sediments. Accuracy and precision of the measurements can be increased by using a portable turbidimeter in the original SPSS method. The modified method has the potential for applying to a study of under-water light environment, which may influence coral-algal competitions in degrading reef conditions.

    DOI： 10.3755/jcrs.2004.1

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  • サンゴ骨格を用いた古海洋環境の復元 (特集 環境を記録する生物(1))

    井上 麻夕里

    地質ニュース   ( 575 )   26 - 33   2002.7

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  • Heavy Metals in Coral Skeleton as Proxies for Marine Pollution

    INOUE Mayuri, SUZUKI Atsushi, KAN Hironobu

    Bulletin of the Society of Sea Water Science, Japan   56 ( 2 )   113 - 117   2002

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    Language：Japanese   Publisher：The Society of Sea Water Science, Japan  

    DOI： 10.11457/swsj1965.56.113

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  • Trace elements in coral skeleton –Potential proxies for marine pollution–

    INOUE Mayuri, KAN Hironobu, SUZUKI Atsushi

    Chikyukagaku   36 ( 2 )   65 - 79   2002

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    Language：Japanese   Publisher：The Geochemical Society of Japan  

    Coral reefs are increasingly threatened by human activities (e.g., sewage discharge and industrial effluents). Composition of coral skeleton is expected to quantitatively record the change in marine environments in which skeletal calcium carbonate is precipitated. Recently, trace elements, particularly heavy metals, in the skeleton of massive and annually banded corals have been successfully used as a proxy of marine pollution at regional and local scale. Critical problems, however, exist due to lack of a well-established method for analyzing trace elements in coral skeleton. Large range in reported values for heavy metal concentrations in coral skeleton could be attributed to differences in pretreatment procedures of skeletal materials rather than the real extent of marine pollution. In this review, we summarize recent progress of studies on the topics and key factors for the further application of coral proxies in order to reconstruct the history of marine pollution.

    DOI： 10.14934/chikyukagaku.36.65

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Research Projects

  • Geographical studies of coastal waters: creating coastal seafloor geomorphology and visualization and enlightenment of seafloor landscape

    Grant number：21H04379  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    菅 浩伸, 後藤 和久, 藤田 和彦, 横山 祐典, 渡部 真史, 後藤 秀昭, 島津 弘, 清野 聡子, 長谷川 均, 堀 信行, 今里 悟之, 小野 林太郎, 高橋 そよ, 伊藤 幸司, 鈴木 淳, 井上 麻夕里, 藤田 喜久, 平林 頌子, 木村 淳, 中西 裕見子, 片桐 千亜紀, 山舩 晃太郎

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    Grant amount：\42250000 （ Direct expense: \32500000 、 Indirect expense：\9750000 ）

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  • Past climatic change and its influence on the Japanese society

    Grant number：20H01981  2020.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    川幡 穂高, 井上 麻夕里, 鈴木 淳, 吉田 明弘, 大石 龍太

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    Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

    近年，完新世の気候変動は，人間の移動と発達に大きな影響を与えたと考えられている．日本では，中石器時代の文明は約16,000年前（縄文時代）に始まった．そして，3000年前頃，水稲栽培の技術を持った人々が中国本土から日本列島に移住し弥生時代となった．本研究では，水稲栽培の発祥の地である中国の浙江沿岸の沿岸から復元された古水温と比較するため，博多湾の堆積物より今回新たに古温度変化を復元した．アルケノンから復元した水温は18.7℃から21.8℃まで変動し，数百年から数千年のスケールで変動した．過去7,000年間の温度は数百年から数千年の規模で変動し，両者で類似していた．この中で約300年前と約4,200年前の寒冷イベントは，小氷期と4.2 kaイベントに対応していた．この「4200年前イベント」は， 2018年7月に国際年代層序表に関する国際層序委員会により完新世の中期／後期境界として正式に認定された．興味深いことに，場所によって乾燥，洪水，寒冷など特徴が異なっているものの，気候の異常が報告された地域はほぼ温帯域に位置していた．筆者たちは，私達の研究地域の寒冷化はアジアモンスーンや偏西風などの変調が原因と考えている．さらに，浙江海岸では，約4,200年前の寒冷イベントに伴い，沿岸湧昇が強化されたために寒冷化が増幅されたと示唆された．現代日本人の半分程度の遺伝子をもたらした祖先である弥生・渡来人は，4200年前は中国に暮らしていた．水稲栽培が始まった長江下流域では，文明が途絶えるほどの厳しい寒冷化を経験した．現代日本人の遺伝子の中に，当時中国に生活していた日本人の祖先の遺伝子を特定できる．この遺伝子のグループについて，過去の人口変動を現代人の遺伝子の解析から推定できる．このデータに基づくと，水稲栽培を生業としていた人びとの人口が大きく減少したことが示唆される．

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  • Comprehensive study on high-time resolution reconstruction of paleo-climate and its social impact assessment using sedimentary and coral samples around Japan

    Grant number：23K20242  2020.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    川幡 穂高, 井上 麻夕里, 鈴木 淳, 吉田 明弘, 大石 龍太

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    Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

    江戸時代は，北半球の平均気温が0.6℃ほど低下したと推定される「小氷期」と呼ばれる寒冷な時代であった．このように寒冷化が常態化した条件で，火山噴火やエルニ－ニョなどが起こると，極端な冷夏が訪れる．日本では江戸時代後半に顕著な冷夏により天明・天保の大飢饉などを経験した．
    天明の大飢饉は主に極端な冷夏によって引き起こされた．これは1782～87（天明2～7）年の6年もの長期間継続した．特に甚大な被害を被ったのが東日本と東北日本であったが，九州，四国でも被害が報告されており，被害は全国的規模であった．幕府による1780年と1792年の人口調査によると，人口は1,119,059人減少となり，全人口の約3%に達する人命が失われたことになる．
    従来，天明の大飢饉の主たる原因は，浅間山の噴火であると説明されてきたが，文献調査をしした結果，これは正しくないことが判明した．浅間山の本格的な噴火は1783年7月で，それ以前に飢饉の前兆となる「ヤマセ」が三陸海岸では吹いていた．1783年には青森県弘前市にある岩木山も噴火したので，東日本と北日本の耕作地は降灰を被った．降灰は農作物の収量低下を引き起こし，量が多くなると大凶作となる場合が多い．
    東北地方は「天明・天保の大飢饉」を経験し，仙台藩の文書によれば米の収量が30%以下まで落ち込んだことが記録されている．私たちのこれまでの成果に基づくと，「天明・天保期の寒冷イベント」は過去8,000年間で最寒期であると予想される． 今回，松島湾内で堆積物柱状コアの入手ができた．松島湾は内湾で水深が4mと浅いが，江戸時代の環境復元に最適で，天明・天保期の堆積物は，海底面より20から40cmの深さにあると推定される．海底柱状試料を採取し，日本の歴史記録と環境の関係を明らかにしたい．

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  • 人間活動が支配する新しい地球環境時代の開始とその評価に向けて

    Grant number：20K12135  2020.04 - 2024.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    井上 麻夕里

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    Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

    本研究では東南アジア海域から採取されたサンゴ骨格試料を用いて、全球同時的な地球温暖化が開始した時期、および地球温暖化を含む全球規模の人間活動の局所的な海域への影響評価を目的としている。昨年度、バリ島のサンゴ年輪についてSr/Ca比および酸素同位体比を測定したところ、年輪カウントによる年数と化学分析による年数が一致していない箇所があり、サンゴの年輪形成機構について精査する必要があることが分かった。よって、本年度はインドネシア・ジャワ海のサンゴ試料について、微小試料採取を行い、細かくSr/Ca比およびMg/Ca比測定を実施し、骨格の密度バンド（年輪）がどのような環境で形成されているのか、ということについて調査を開始した。今のところ、Sr/Ca比の変動と密度パターンが毎年一致しておらず、必ずしも海水温が骨格密度を規定している要因だとは限らないことが推察されている。今後、異なる場所のサンゴ試料でも検証していく予定である。
    また、すでに分析済みのフィリピンのサンゴ試料のSr/Ca比および酸素同位体比について２２８年間分のデータを見直し、再構築を行った上で、先行研究との比較なども実施し、論文を投稿した。新たな考察の結果、1800年代はクラカタウやタンボラのような大規模噴火に伴う寒冷化が何度か認められていたこと、1975年以降から全球規模でより画一的な温暖化が加速していることが分かってきた。同様に、バリ島のSr/Ca 比と酸素同位体比の結果についても、こちらは特にインドネシア通過流とその気候に及ぼす影響の観点からデータをまとめ、論文を投稿した。バリ島では全球規模の近年の温暖化に反して、寒冷化傾向が認められており、インドネシア多島海での海洋環境の複雑性、また気候の調節機能があることが示唆されている。

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  • 海洋酸性化が沿岸生物の世代交代、群集・個体群構造に及ぼす長期影響評価

    Grant number：19H04288  2019.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    高見 秀輝, 林 正裕, 井上 麻夕里, 村岡 大祐, 小埜 恒夫, 酒井 一彦, 井口 亮

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    Grant amount：\17290000 （ Direct expense: \13300000 、 Indirect expense：\3990000 ）

    二酸化炭素濃度を1000ppmおよび2000ppmに調整した海水と約400ppmの原海水（対照区）で4年間飼育したキタムラサキウニを親として用い、対照区の親から得られた子世代を1000ppmと2000ppmで飼育する実験区(非順化区)と、1000ppmと2000ppmで飼育した親から得られた子世代をそれぞれ親と同じ濃度で飼育する実験区(順化区)を設定した。各実験区の子世代について、受精後8日目の八腕期浮遊幼生の段階で腕長を比較した結果、2000ppmの非順化区のみ対照区と比較して平均値が低下した。以上から、幼生期における酸性化環境への順化・適応については2000ppmで影響が出る可能性が考えられた。親ウニの棘の微量元素の経年分析の結果から、幼生期は成熟個体よりも棘のMg/Ca比が高くなる傾向にあることが示唆された。造礁サンゴの三種の長期飼育実験に向けて、異なる二酸化炭素濃度条件で短期飼育実験を実施した。その結果、これらサンゴ種の長期飼育条件が明らかとなり、海水酸性化にエダコモンサンゴが最も脆弱であることが判明した。遺伝子解析について、サンゴのトランスクリプトームデータから、サンゴと褐虫藻に加えて、他の内在生物の遺伝子データの分離を行い、各生物での発現量マトリックスの作成を進めた。褐虫藻組成に関しては、ストレス暴露処理間では明瞭な差異は見られなかった。キタムラサキウニに関しては、ストレス暴露処理サンプルのRNA抽出を行い、RNA-seqによるショートリードデータの取得に成功した。魚類に関しては、トランスクリプトーム解析に向けたサンプル処理の準備を進めた。
    二酸化炭素濃度の精度管理については、船舶観測用pCO2計を用いて飼育水のpCO2レベルを直接測定し、飼育実験装置のpCO2制御装置に生じたずれの検出とずれ補正式の作成を行いより精度の高い濃度管理が可能となった。

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  • Investigation of spatial-temporal transition and influx of heavy metal pollution on the coast of the Dominican Republic and validation of load source measures

    Grant number：16H05631  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Sakuno Yuji

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    Grant amount：\16120000 （ Direct expense: \12400000 、 Indirect expense：\3720000 ）

    Chemical analysis of coral samples in the estuary and analysis of outflow patterns by satellite remote sensing and numerical model were carried out to understand the actual situation of heavy metal outflow to the coast of the Dominican Republic. The study suggests that heavy sanitation in the capital Santo Domingo is insufficient for living and industrial waste treatment facilities, and that heavy metals may be brought to the sea area from the large river represented by the Haina River. In particular, it has become clear that lead contamination from battery factories can be detected by massive corals. In addition, it was also found that flood events such as hurricanes have serious impacts from other sources.

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  • Studies on marine environments of Indonesian throughflow and its impact on the climate and coral reefs

    Grant number：15H05329  2015.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    Inoue Mayuri

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    Grant amount：\24700000 （ Direct expense: \19000000 、 Indirect expense：\5700000 ）

    Geochemical tracers such as Sr/Ca, U/Ca, oxygen and carbon isotope ratios were measured on annual bands of the coral skeleton collected from Java Sea in order to reconstruct marine environments for the past 70 years. As a result, 0.7 degree C warming was found for this time period. Especially impact from emission of fossil fuels seems to be intensified since 1970s as seen in the record of carbon isotope ratios as well as U/Ca ratios. Based on the variation of Sr/Ca and U/Ca ratios for 70 years, seawater pH would be decreased since 1970s probably due to the anthropogenic CO2 emission.

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  • Experimental studies of ocean acidification impact on coastal marine organisms and ecosystem

    Grant number：26220102  2014.05 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Nojiri Yukihiro

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    Grant amount：\194870000 （ Direct expense: \149900000 、 Indirect expense：\44970000 ）

    Impacts of ocean acidification for coastal species were evaluated including the CO2 ranges, expected by the emission scenarios under possible future socio-economic conditions. Ordinary corals, bivalves, and sea urchins inhabiting in Japanese coastal areas were tested and additional tests with increased water temperature were carried out for corals. Impacts for larval shell formation of Ezo abalone showed relationship with integration of exceedance of concentration from a critical value and exposure time. For two coral species of Okinawa, additive impacts of acidification and water temperature increase were observed. Recruitment experiment into the CO2 concentration adjusted tanks were carried out for evaluation of ecosystem impact of acidification and change of Mg/Ca ratio in shell carbonate in accordance with acidification were observed. Difference in reproduction impacts for two fish species was observed. Acclimation test of a fish species was experimented during subculture process.

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  • Survey of past/present lead pollution caused by a battery factory in the coastal area of Dominican Republic

    Grant number：24404006  2012.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NAKAI Satoshi, MUTSUDA Hidemi, SAKUNO Yuji, OKUDA Tetsuji, SUZUKI Atsushi, NAGAO Masayuki, INOUE Mayuri

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    Grant amount：\17420000 （ Direct expense: \13400000 、 Indirect expense：\4020000 ）

    In order to reveal contamination of lead derived from a battery factory in the river and coastal area in Dominican Republic, many sediment and massive coral samples were collected from the river mouth of Rio Haina and analyzed for lead. In addition, diffusion of suspended matters from the river mouth of Rio Haina were predicted using the satellite observation data, while a quantitative model was proposed using the satellite observation data for estimation of suspended matters distribution. Applying the ALOS AVNIR-2 data to these models, mapping of suspended matters was carried out. Finally, a coastal environment simulation was carried out to predict 3-dimensional diffusion of suspended matters from the river mouth of Rio Haina to the Caribbean Sea.

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  • Inter- and intracolony variability of coral climate proxies and implication for coral climatology

    Grant number：24244090  2012.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro

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    Grant amount：\48620000 （ Direct expense: \37400000 、 Indirect expense：\11220000 ）

    As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

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  • Study on ocean acidification and mass extinction of biosphere in the earth surface's environmental system

    Grant number：22224009  2010.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    KAWAHATA Hodaka, SUZUKI Atsushi, YAMAOKA Kyoko, MAYURI Inoue, NISHI Hirosi

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    Grant amount：\142610000 （ Direct expense: \109700000 、 Indirect expense：\32910000 ）

    This study focused on reevaluating conditions based on samples taken from the Ayeyarwady, Mekong, and Chao Phraya rivers. Our calculations suggest that chemical weathering and associated CO2 uptake in the Himalayas have played a minor role in long-term global cooling in the past. In contrast, soil respiration in these river basins, which have thick, well-developed soil layers, increases river water pCO2, and on a short timescale these rivers function as strong sources of CO2 to the atmosphere.
    In Paleocene/Eocene (P/E) transition at 56-57 Ma, a pH decrease was very likely responsible for the emergence of agglutinated foraminiferal fauna as calcareous fauna was eliminated by acidification. Current global emission rate (~7.3 peta gC yr-1) of anthropogenic carbon input is approximately 30 times. The results give an implication that the deep sea benthic fauna will be threatened in future in combination with ocean acidification.

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  • 精密飼育実験に基づく間接指標の開発と低中緯度域の気候変動システムの解明

    Grant number：22244064  2010

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    川幡 穂高, 鈴木 淳, 井上 麻夕里

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    Grant amount：\23920000 （ Direct expense: \18400000 、 Indirect expense：\5520000 ）

    研究の目的は,(1)サンゴ礁に生息する大型底棲有孔虫(Amphistegina lobifera,Marginopora kudakajimensis)を対象に精密飼育実験を行い,水温・塩分・pHに関して新しい環境間接指標を開発し,IODP(統合国際深海掘削計画)のグレートバリアリーフとタヒチから得られた試料に適用し,低緯度域のエルニーニョ・南方振動を明らかにする.(2)サンゴの飼育実験より,pH指標に関して,サンゴ骨格のU/Ca比などの新しい指標を開発するとともに,それを用いてpH時系列のデータを復元し,石灰化への影響,海洋環境や気候変動からの影響を明らかにする.(3)また,翼足類について,精密飼育実験を行い,水温・塩分・pHに関して新しい環境間接指標を開発するとともに,実海域での分布などを把握し,将来の海洋酸性化による影響を評価することである.
    サンゴについては,試料を採取し,精密飼育実験のセットアップを行い,飼育を継続できた.現在,その試料について,1)酸素・炭素の安定同位体比,2)ホウ素同位体,3)微量無機元素などを分析中である.また,翼足類についても,プランクトンネットにても,現生の試料を採取した.そして,海水中の二酸化炭素濃度をコントロールした海水中で飼育中である.

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  • Reconstructions of seasonality of sea surface temperature and salinity in the tropics during the last glacial maximum based on a fossil coral

    Grant number：21740387  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    INOUE Mayuri

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    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    The magnitude of cooling of sea surface temperature(SST) during the last glacial maximum(LGM) in tropical to subtropical regions remains controversial. We conducted Sr/Ca andδ^<18> O measurements on a coral(Porites sp.) yielding a<230>^Th age of 22 ka that was retrieved from Vanuatu in the southwest Pacific. Our results indicated large, seasonal SST changes(~ 5℃), in particular, large cooling during the austral winter, at the LGM as compared to the present(<3℃). In addition, if the previously reported slight freshening around Vanuatu during the LGM is assumed, then a simple mathematical mass balance model indicates a decrease in the mean annual SST of 4. 5. 5℃.

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  • Study on coral calcification and signal recording ability of coral climate proxies

    Grant number：21340166  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    SUZUKI Atsushi, INOUE Mayuri, SAKAI Kazuhiko, KATO Aki, OKAI Takashi, KAWAHATA Hodaka, MURAYAMA Syohei

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    Grant amount：\14820000 （ Direct expense: \11400000 、 Indirect expense：\3420000 ）

    Corals are rich archives of climatic changes in tropical seas covering from the recent to distant past. The isotope and elemental compositions of coral skeletons reflect physicochemical parameters of the ambient seawater. In this study, we examine the magnitude of growth-rate influence on coral oxygen and carbon isotope and Sr/Ca ratios in a long-term common-garden culture experiment of Porites australiensis corals. This project involved paleoclimate analyses of coral skeletal records. Coral proxy records from Ogasawara and Ishigaki revealed several coupled phenomena during the early 20th century in the northwestern subtropical Pacific.

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  • Historic changes in coral reefs and their stressors

    Grant number：20121004  2008 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    YAMANO Hiroya, HASEGAWA Hitoshi, WATANABE Tsuyoshi, INOUE Mayuri, SUZUKI Atsushi, OGUMA Hiroyuki, SHIRAI Kotaro

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    Grant amount：\131950000 （ Direct expense: \101500000 、 Indirect expense：\30450000 ）

    Based on historic maps, aerial photographs and satellite images at Ishigaki Island, Japan, we revealed increase in sediment discharge due to land development in the watershed of Todoroki River may have caused decrease in coral cover. Analysis of coral annual bands collected closed to the river mouth indicated increase in sediment discharge and resulting decrease in coral calcification.

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  • Development of culturing system for coral and establishment of precise proxies using coral skeleton

    Grant number：19840020  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (Start-up)

    INOUE Mayuri

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    Grant amount：\3105000 （ Direct expense: \2700000 、 Indirect expense：\405000 ）

    サンゴ骨格中のストロンチウム/カルシウム(Sr/Ca)比やマグネシウム/カルシウム(Mg/Ca)比は、海水温指標としてこれまで世界的に広く測定されているが、近年これら微量元素が海水温のみではなくサンゴ骨格の成長速度にも依存している可能性が指摘されている。そこで本研究では、温度と光量のみを厳密に制御したサンゴの飼育実験を行い、Sr/Ca比はこれまでの報告と同様海水温に、一方Mg/Ca比は温度ではなく成長速度により強く依存して変動していることを明らかにした。

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  • サンゴ骨格を用いた熱帯域における微量化学物質による海洋汚染の精密復元に関する研究

    Grant number：04J03245  2004 - 2005

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    井上 麻夕里

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    Grant amount：\1800000 （ Direct expense: \1800000 ）

    人為起源の鉛は,有鉛ガソリンの使用,石炭燃焼や鉛・銅などの鉱山の採掘など主に工業化に附随して放出されることが知られているが,近年アジアにおいて工業起源の鉛の放出量が増加していることが指摘されている.前年度の研究から、西太平洋においては大陸起源の鉛が外洋表層まで広がっていることが明らかにされている。そこで今年度はサンゴ骨格を用いて,アジアから排出される汚染物質の影響を強く受ける西太平洋表層における鉛の時系列変動を明らかにした.試料は海南島,小笠原,ジャカルタ湾から採取されたサンゴ骨格(Porites sp.)を用い,過去それぞれ約10年間,100年間,70年間の鉛濃度変動を復元した.サンゴ骨格中の鉛濃度の測定はICP-MSを用いて行い,サンゴ標準試料であるJCp-1の15回の繰り返し測定による誤差は2.3%だった.
    サンゴ年輪に沿った鉛の測定結果からは,小笠原,ジャカルタ湾ともに過去それぞれ100年,70年において鉛濃度が上昇傾向にあった.このことから,アジア大陸から西太平洋,インドネシア各都市からジャワ海へと放出されている人為起源の鉛が,過去70年以上にわたって増加し続けていることが明らかとなった.特に小笠原のコアからは、1950年以降に鉛濃度の急激な上昇が見られ、これは日本を始めとするアジア各国における工業化のためと考えられる。また海南島のサンゴ骨格からは,1997年に急激な鉛濃度の減少が見られた.中国沿岸部では1997年から無鉛ガソリンの導入が行われ始めたので,この無鉛ガソリンの導入に対応して,サンゴ骨格中の鉛濃度が減少したことが示唆された.

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