Growth Inhibition of a Red Tide Flagellate, Chattonella antiqua by Copper

概要

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Copper toxicity in Chattonella antiqua (Raphidophyceae) was examined using an artificial seawater medium. The growth rate (μ) was found to be a unique function of cupric ion activity (acu) as follows: μ=μmax/(1+K (acu) 2), where μmax and K are 0.63 d-1 and 2.4×1020 mol-2l2, respectively. The value of acu at which μ is reduced to half the maximum is 10-10.2M. A comparison of our results with those for other phytoplankton species indicated C. antiqua to be rather sensitive to cupric ions. Furthermore, the growth of C. antiqua was strongly influenced at the calculated cupric ion activity of natural seawater in the Seto Inland Sea, assuming only inorganic copper complexation. Thus, organic chelation may be necessary before C. antiqua is capable of competing with other phytoplankton species.
日本海洋学会の論文