|The relationship between phytoplankton growth rate and production with emphasis on respiration and excretion|
Sakshaug, E. (1993). The relationship between phytoplankton growth rate and production with emphasis on respiration and excretion. ICES Mar. Sci. Symp. 197: 63-68
In: ICES Marine Science Symposia. ICES/Reitzel: Copenhagen. ISSN 0906-060X, more
Algae; Computer applications; Computer applications; Excretion; Growth; Growth rate; Laboratory culture; Light; Light effects; Mathematics; Measurement; Modelling; Photosynthesis; Phytoplankton; Primary production; Productivity; Productivity; Productivity; Respiration; Vertebrae; Algae; Cephalochordata [WoRMS]; Urochordata [WoRMS]; Marine
Rates of respiration and production of extracellular matter represent losses from phytoplankton, depend on the growth regime, and may become particularly high in stressed cells. They are also species-dependent to an extent that should be taken into consideration in models; species dependence in respiration rates to some extent may reflect differences in strategies for the uptake of nitrogen. In some species the mitochondrial respiration rate in the light is considerably higher than in the dark. For such species calculations on the basis of measurements of oxygen uptake in darkness may lead to underestimation of the gross phytosynthetic rate in terms of oxygen evolution and, conversely, underestimation of net carbon uptake on the basis of data for gross carbon uptake. Studies of laboratory cultures of three diatom species indicate that net particulate carbon uptake on average may be as low as similar to 50% of gross carbon uptake. This implies that the photosynthetic efficiency (alpha) and the maximum photosynthetic rate (Pm) for net particulate uptake should be that much lower than the corresponding values relevant for gross carbon uptake.