| Chemical Properties of Sediment in Nanakita Estuarine
Tidal Flat: Estimation of Sedimentary Organic Matter
Origin by Stable Isotope and Fatty Acid |
| Woo-Seok Shin1,2†, Yoshio Aikawa1, and Osamu Nishimura1 |
1Graduate School of Engineering, Department of Ecological Engineering, Tohoku University, Sendai 980-8579, Japan
2Institute of Marine Science and Technology Research, Hankyong National University, Anseong 456-749, Korea |
Corresponding Author:
Woo-Seok Shin ,Tel: +82-31-670-5621, Fax: +82-31-670-5622, Email: swooseok@hknu.ac.kr
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Received: January 12, 2012; Accepted: May 17, 2012. |
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| ABSTRACT |
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The spatial variation of organic matter sources in tidal flat sediment of the Nanakita River estuary, involving Gamo lagoon on the
north-east coast of Honshu Island, Japan, was examined using carbon stable isotopes and fatty acid biomarkers. The spatial variation of
total organic carbon (TOC) contents and δ13C values were highly variable in between the stations, such as sandy flat (1.3 mg/g, -21.0‰),
sand-muddy flat (2.6 mg/g, -21.9‰), and muddy flat (24.9 mg/g, -25.9‰), respectively. Particularly, at the muddy flat, high TOC content
and low δ13C value of the sediments indicated that the surface sediment was composed largely of terrestrial organic matter. Whereas, at
the sandy flat and sand-muddy flat, the high ratios of diatom and bacteria biomarkers indicated the high contribution of abundant microorganism
along with marine organic matter in sediment composition. From these results, it considered that the amount and origin
of transported sedimentary organic matter indicated different characteristics in this study stations. |
| Keywords:
Estuary | Intertidal flat | Microorganism | Sediment | Spatial variation |
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