Abstract
Seawater concentrations of dissolved Cd and PO 4 from the euphotic zone at Funka Bay were determined during March–August 1984. The bay is isolated from the outside sea during this period. The concentrations decrease with time from March to August. Plotting [Cd] vs. [PO 4] results in a convex curve about a straight line through the origin. In addition, the uptake rates for both Cd and PO 4 were measured by culture experiments involving several phytoplankton species. By assuming that the uptake rates are first-order, the following equation was obtained: [Cd] = exp( Kln [PO 4] + const.), where K represents the ratio of the rate constants for the uptake of Cd and PO 4. For K = 1, the points lie on a straight line through the origin, whereas for K < 1, a convex curve above the straight line is obtained. In the culture experiments the K values were all <1. The mechanism controlling the seasonal variations of [Cd] and [PO 4] in the bay can be explained by the uptake rates of Cd and PO 4.
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