Japan Geoscience Union Meeting 2015

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Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW27] Water and material transport and cycle in watersheds: from headwater to coastal area

Sun. May 24, 2015 4:15 PM - 6:00 PM 301B (3F)

Convener:*Shinji Nakaya(Department of Civil Engineering, Faculty of Engineering, Shinshu University), Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University), Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Kazuhisa Chikita(Department of Natural History Sciences, Faculty of Science, Hokkaido University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Masahiro Kobayashi(Forestry and Forest Products Research Institute), Seiko Yoshikawa(Narional Institute for Agro-Environmental Sciences), Noboru Okuda(Research Institute for Humanity and Nature), Chair:Kazuhisa Chikita(Department of Natural History Sciences, Faculty of Science, Hokkaido University), Masahiro Kobayashi(Forestry and Forest Products Research Institute)

5:15 PM - 5:30 PM

[AHW27-26] Estimation of nutrient load via to the sea effect of nutrient enrichment on calcification of hard coral

*Jun YASUMOTO1, Ko YASUMOTO2, Mina HIROSE3, Kazuki NAKAMOTO1, Takuji NAKANO1 (1.University of the Ryukyus, 2.Kitasato Univ. School of Marine Bioscience, 3.Tropical Technology Plus)

Keywords:nutrient Enrichment, groundwater, calcification of hard coral

Coral reef degradation resulting from various types of stress such as nutrient enrichment and inflow of red sand in coastal waters is of increasing global concern. In general, tropical and subtropical seawaters are poor in nutrients and thus oligotrophic. Therefore, the above-mentioned stresses result in the decline of environments favorable to coral growth. Especially phosphate has been considered to possibly inhibit the formation of coral skeleton due to its ability to bind to calcium carbonate. Despite many studies about the effects of nutrients on coral, a clear consensus on how nutrients negatively affect coral still does not exist.
In this study, we estimated the nutrient load through groundwater to the coral reefs sea region of Okinawa through field measurement and numerical simulations, and investigated the effect of phosphate on in vivo skeleton formation of primary polyp for hard coral Acropora digitifera.