Carbon budgets in batch and continuous cultures: How can we understand natural physiology of marine phytoplankton?

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Abstract
Monitoring of respiratory and organic losses from carbon assimilation for the diatom Thalassiosira pseudonana shows very slight (about 5%) total carbon losses in continuous culture. Although correlation between batch and continuous culture cellular chemistry was less than ideal, batch culture exponential phase cells showed carbon metabolism similar to that for the continuous culture. In both cases, growth rates were in excess of 1.5 divisions d−1 and total carbon losses in the batch exponential phase were similar (50%). To understand phytoplankton physiology in nature, it is necessary to find what effects growth rate and population density have on carbon losses and to ascertain whether or not steady state conditions really pertain to the ocean.

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