Abstract
Starting in March there was an increase in bacterial number until a maximum was reached at the end of April; from then there was a decrease in number until the end of summer. The biomass of the phytoplankton followed an opposite curve,viz. a maximum in February, a minimum at the end of April and several pulses in summer. Two hypothetical models are described to explain this phenomenon. (a) Competition for phosphate between phytoplankton and bacteria (with subsequent grazing by herbivorous zooplankton on bacteria), and (b) excretion by bacteria of compounds that inhibit phytoplankton growth.
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