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• W2150818949 abstract "One of the main parameters of the condition of planktonic algae that determines the primary production of the phytocoenosis is the efficiency of the functioning of the photosynthetic system. At present, great success is achieved in the use of luminescence methods for estimates of the phytoplankton abundance and functional condition of its photosynthetic system [2‐4, 7‐ 11, 17]. These methods provide high sensitivity and output, and allow one to perform measurements in situ in an on-line mode. The efficiency of the measurements of the fluorescence from vessels is especially important when studying mesoscale processes in marine ecosystems, which are distinguished by their high temporal variability. The fluorescent methods are based on the fact that the chlorophyll existing in photosynthetic membranes serves as a kind of natural sensor of the alga cell condition. The successes in the studies of the mechanisms of primary photosynthetic processes and the wide use of fluorometric methods in the studies of alga physiology and ecology allowed scientists to recognize the relations of the chlorophyll fluorescence parameters to the characteristics of the photosynthetic system of the photosynthesizing organisms [3, 4, 8]. Under regular physiological conditions, 2‐3% of the light absorbed by photosynthetic pigments is radiated in the form of fluorescence. About 90% of this fluorescence is radiated by chlorophyll a of photosystem 2. The energy of the light quanta absorbed by the light-collecting unit may be converted into the energy of separated charges, which is later utilized in the subsequent photosynthetic reactions or lost either through the emission of quanta of fluorescence or through diffuse heat radiation. The measurements of the ratio between the chlorophyll fluorescence intensity in light saturating the photosynthesis ( F m ) and that under conditions that cause no changes in the condition of the photosynthetic system ( F 0 ) allow one to determine the intensity of the primary photosynthetic processes from the relation ( F m ‐ F 0 )/ F m = F v / F m . The values of the fluorescence intensity F 0 are well correlated with the total contents of pigments of the photosynthetic system of phytoplankton within a wide range of conditions [13]. The efficiency of the primary photosynthetic processes ( F v / F m ) represents a dimensionless characteristic of the energy of photosynthesis similar to the coefficient of efficiency and independent of the species particularities [3, 4]. The maximum theoretically feasible value of the efficiency of light utilization in photosynthesis equals 0.84 at a zero minimum value. A utilization efficiency close to zero points to the separa" @default.
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• W2150818949 date "2005-01-01" @default.
• W2150818949 modified "2023-09-27" @default.
• W2150818949 title "Variability in the Condition of the Photosynthetic System of the Black Sea Phytoplankton" @default.
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