where
phytoplankton standing stock at the beginning of grazing to Bt standing stock at the end of grazing Thus the Eq. (3) allows change in phytoplankton standing stock if reproduction, grazing and mortality of the algae are taken into account. Fig. 1 consists of 3 curves determining(1) increase in phytoplankton standing stock(exponential since eliminating is lacking); (2) changes in grazing rate; (3) changes in phytoplankton standing stock as a result of a momentary action of both reproduction and elimination. From(3), knowing the coefficients k and ku, initial Bo, and finite Bt phytoplankton standing stock, one can determine the amplitude A for curve(2)