TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 63 (No. 2), pp. 341-347, 2007

Short Contribution

Concentration Level of Dissolved Cadmium and Its Variation in Surface Seawater of Urasoko Bay, Ishigaki Island

Kazuo Abe*

Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fukai-Ota, Ishigaki 907-0451, Japan

(Received 31 July 2006; in revised form 19 October 2006; accepted 1 November 2006)

Abstract: From April 2005 to March 2006, the concentration of dissolved cadmium (Cd) was monitored in the surface seawater of Urasoko Bay, which is in a subtropical area of the North Pacific Ocean and is surrounded by a well-developed fringing reef. During this period, the observed salinity and Cd concentrations varied in a range of approximately 16-34.5 and 4.8-77.8 pM, respectively. The concentration range of Cd obtained in this study was considered to be too low to damage the coral species, and its variation throughout the year did not show any seasonality and was not connected with climate data. The Cd-salinity plot for all the data in the salinity range over 26 showed apparent non-conservative behavior, which suggests a possible irregular input of Cd from a solid phase through streams and groundwater, release from bottom sediments, and atmospheric deposition into the bay.

*E-mail: abek@fra.affrc.go.jp

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