Abstract
Fronds of a calcareous red alga Serraticardia maxima were cultured in the sea water containing H14CO3- or both H14CO3- and 45Ca++ in the ight and in the dark, and radioactivities incorporated into calcium carbonate deposited were determined. It was found that the rate of calcium carbonate deposition was accelerated in the light to an extent of 2-4times as that in the dark. On the basis of the data from pyruvate-U-14C infiltration experiment and from measurement of the respiration rate of algal fronds, carbon dioxide originated from the respiration was found to contribute rather slightly to calcium carbonate deposition. Most of the carbon of calcium carbonate was derived from carbonic ions in sea water. An exchange reaction between the calcium carbonate deposited and the calcium and carbonic ion in sea water was observed in both intact and boiled fronds. It was found that the exchange reaction is much higher in the latter than in the former.
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