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Phosphate uptake by zooxanthellae isolated from corals

[32P]orthophosphate was used to study phosphate uptake by Symbiodinium sp. isolated from the hermatypic coral Acropora formosa. The results for phosphate uptake are uniphasic and obey Michaelis-Menten kinetics. The value for the Michaelis constant (Km) was 14 μM. Phosphate uptake was dependent on light. Preincubation of freshly isolated zooxanthellae in the presence of 500 μM phosphate caused a significant decrease in uptake capacity. These results suggest that the zooxanthellae in this study originate from conditions where phosphate is depleted. The results are discussed in relation to the depletion-diffusion hypothesis for nutrient uptake in zooxanthellate symbiosis.