PROFILE VARIABILITY AND DIURNAL RHYTHM OF CHLOROPHYLL FLUORESCENCE ASA MANIFESTATION OF BACTERIAL-ACTIVITY IN THE BLACK-SEA C-LAYER

Chlorophyll fluorescence and sea water turbidity have been investigate d in the upper 250-meter layer of the Black Sea by means of a multicha nnel fluorometer probe. Differences in fine structure of fluorescence and turbidity profiles have been revealed and a diurnal rhythm of chlo rophyll fluorescence have been discovered within its secondary maximum attached to the C-layer. The observation results support the idea tha t obligate phototroph bacteria are carriers of chlorophyll fluorescing in the C-layer, point to bacterial photosynthetic activity and offer promise for fluoremetric chemocline monitoring in unoxic basins.