Author(s)

S. Meksumpun, C. Meksumpun, A. Hoshika, Y. Mishima & T. Tanimoto

Abstract

Stable carbon and nitrogen isotope techniques were used to clarify the movement of terrestrial organic matter and the status of coastal environment of the Osaka Bay which was known as one of the most polluted coastal areas in Japan. Sedimental cores and particulate matter samples from the Yodo River and the Osaka Bay were collected for examination of 6^C, 6^N, carbon and nitrogen contents. Means 6^C for sediment, large size of participate organic matter (15-149 jum) and small size of particulate organic matter (<15 //m) in the Yodo River were -25.1 ±0.2 %o, -25.3±0.6%o and -25.5±0.4%o, respectively, whereas means of those the inner part of the Osaka Bay were -20.6±0.3 %o, -21.6±1.

Keywords