Japan Geoscience Union Meeting 2014

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Symbol B (Biogeosciences) » B-BG Biogeosciences & Geosphere-Biosphere Interactions

[B-BG21_1AM1] Material cycles in tropical- subtropical coastal ecosystems

Thu. May 1, 2014 9:00 AM - 10:30 AM 213 (2F)

Convener:*Atsushi Watanabe(Department of Mechanical and Environmental Informatics Graduate School of Information Science and Engineering Tokyo Institute of Technology), Kazuhiko Fujita(Department of Physics and Earth Sciences, University of the Ryukyus), Chuki Hongo(Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus), Chair:Atsushi Watanabe(Department of Mechanical and Environmental Informatics Graduate School of Information Science and Engineering Tokyo Institute of Technology), Kazuhiko Fujita(Department of Physics and Earth Sciences, University of the Ryukyus), Chuki Hongo(Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus)

9:15 AM - 9:30 AM

[BBG21-02] Ocean acidification influences on coral growth of temperate species

*So KIM1, Atsushi SUZUKI2, Masahiro HAYASHI3, Yuzo YAMAMOTO3, Kimiaki HOTTA3, Ryosuke ISONO3, Yusuke WATANABE3, Hiroya YAMANO4, Keiichi NOMURA5, Kozue NISHIDA2, Mayuri INOUE6, Jing ZHANG1, Yukihiro NOJIRI4 (1.Toyama University, 2.Geological Survey of Japan, AIST, 3.Marine Ecology Research Institute (MERI), 4.National Institute for Environmental Studies, 5.Kushioto Marine Park, 6.Atmosphere and Ocean Research Institute, The University of Tokyo)

Keywords:Ocean acidification, temperate coral, calcification, global warming

Carbon dioxide concentration in the atmosphere has steadily increased since the industrial revolution due to burning of fossil fuel and will cause the global warming and ocean acidification. It will raise the ocean temperature around Japan and reduce the seawater pH and then it may bring serious threat to corals dwelling around Honsyu Island, Japan. Last year, our research group did temperature-controlled culture experiments of temperate coral species from the Pacific side of Honsyu Island of Japan under the present level of the partial pressure of CO2 (pCO2). But, synergetic effect of the global warming and ocean acidification on these corals has not been tested yet in detail. In this study, we focus on the how the different pCO2 levels (past, present, and future) can influence skeletal growth of temperate Acropora coral species under the different temperature setting using a precise control system. This system was used to generate six different pCO2 levels: (i) pre-industrial, ~300 μatm, (ii) present-day pCO2, ~400 μatm, and at four near-future conditions, (iii) ~550 μatm, (iv) ~750 μatm, (v) ~1000 μatm and (vi) ~1200 μatm at three temperature conditions (17, 25, and 27 deg C). Our early results suggested a negative influence of higher pCO2 levels on skeletal growth of temperate Acropora corals, but not so sensitive compared to tropical and subtropical Acropora corals.