![]() We have applied this equation to the analysis of the growth and light absorption by Skeletonema costatum cultured under light, temperature, and nutrient limitation. If the capacity for photochemistry exceeds the capacity for assimilation, dissipative processes occur, and the quantum yield is low. ![]() ![]() The independent variables are E?, the light intensity (assumed constant during the photoperiod), and ?, the photoperiod (as a fraction of 24 hours) that the cells are illuminated, ? is the instantaneous capacity of the dark reactions to assimilate electrons, while the product ap?max E?/? is the instantaneous capacity of the light reactions to supply electrons. The value of all three dependent variables is constrained. The dependent variables in this equation are g, the gross specific growth rate, ?, the maximum carbon-specific photosynthetic rate, and, ?, the ratio of carbon to chlorophyll. It can reasonably be assumed that the gross specific growth rate, g, is a function of the specific rate of light absorption. This study presents an approach to describing these interactions. Unfortunately, there has not been a complete mathematical description of the interaction of all four environmental parameters. These same environmental parameters vary with season in the polar seas and presumably affect the growth rate and cellular pigment concentration of the phytoplankton crop. Numerous studies of the growth of phytoplankton in the laboratory have demonstrated the dependence of cellular pigment concentration and growth rate upon light intensity, photoperiod, temperature, and nutrient supply.
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