Japan Geoscience Union Meeting 2015

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS26] Biogeochemistry

Thu. May 28, 2015 2:15 PM - 4:00 PM 104 (1F)

Convener:*Muneoki Yoh(Tokyo University of Agriculture and Technology), Shibata, Hideaki(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chair:Izumi Watanabe(Graduate School of Agriculture, Tokyo University of Agriculture and Technology), Yoriko Yokoo(Faculty of Science and Engineering, Doshisha University), Tomoya Iwata(Faculty of Life and Environmental Sciences, University of Yamanashi), Urumu Tsunogai(名古屋大学大学院環境学研究科)

3:45 PM - 4:00 PM

[MIS26-21] Behavior of organic phosphorus compounds in Lake Kasumigaura, Japan: A 31P nuclear magnetic resonance spectroscopy study

*Ryuichiro SHINOHARA1, Akio IMAI1, Noriko TOMIOKA1, Ayato KOHZU1, Kazuhiro KOMATSU1, Takayuki SATOU1, Tomoharu SANO1, Shingo MIURA1, Koichi SHIMOTORI1 (1.National Institute for Environmental Studies)

Keywords:Phosphorus, 31P nuclear magnetic resonance (NMR)

Phosphorus (P) is an essential nutrient for all living organisms in lakes. In the surface water, particulate P is the major P fraction usually accounting for more than 80% in total P in eutrophic lakes.
The goal of this study is to clarify how nucleic acid-P compounds in suspended particles change with the productions of microorganisms in a shallow eutrophic lake. In particular, primary productions by phytoplankton are the greatest biological productions in surface water in lakes, yet information on P compounds composition through productions of phytoplankton is limited. The current study therefore concurrently analyzes P compounds with 31P NMR spectroscopy, particulate organic C (POC), biomass of M. aeruginosa by the quantitative polymerase chain reaction (qPCR) technique as a possible contributor of nucleic acid-P in Lake Kasumigaura. We hypothesized that (1) concentrations of nucleic acid-P compounds change with production of microorganisms in a shallow, eutrophic lake; and (2) phytoplankton species composition, including M. aeruginosa, could also alter P composition in suspended particles.