Origin and Bacterial Utilization of Organic Matters in Tidal-Flat Sediment

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  • SHIN WOO-SEOK
    Graduate School of Engineering, Tohoku University Institute of Marine Science and Technology Research, Hankyong National University
  • FUJIBAYASHI MEGUMU
    Graduate School of Engineering, Tohoku University
  • NAGAHAMA YUMI
    Graduate School of Engineering, Tohoku University Institute for the Advancement of Higher Education, Hokkaido University
  • NOMURA MUNEHIRO
    Graduate School of Engineering, Tohoku University
  • NISHIMURA OSAMU
    Graduate School of Engineering, Tohoku University

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Other Title
  • 干潟に堆積する有機物の起源およびバクテリアによる利用性
  • ヒガタ ニ タイセキ スル ユウキブツ ノ キゲン オヨビ バクテリア ニ ヨル リヨウセイ

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The origin and bacterial utilization of organic matters in tidal-flat sediment were investigated using stable isotope and fatty acid analysis. Sedimentary organic matter (SOM) and potential food sources such as land plant, marine particulate organic matter (POM), benthic microalgae, riverine POM were taken from Gamo lagoon and Nanakita River Mouth. Land plant (δ13C = －26.6 and δ15N = 3.6) and riverine POM (δ13C = －25.5 and δ15N = 8.9) were isotopically distinct from benthic microalgae (δ13C = －16.3 and δ15N = 6.2) and marine POM (δ13C = －20.3 and δ15N = 10.3). In the degradation experiment of SOM for 50 days, the δ13C value of SOM decreased from －19.1 ‰ to －20.7 ‰. This was due to the preferential utilization of higher δ13C organic matter such as benthic microalgae and marine POM by bacteria. Land plant and riverine POM had begun to degrade after the degradation of benthic microalgae and marine POM progressed.

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