Monitoring of the annual cycle of main components of ecosystem of the Black Sea was carried out in the economic area of the ex-USSR during 1992 – 1993. As a part of the programme, suspended matter content, organic fractions and sedimentation rates in photic zone of the sea were investigated with the involvement of research vessels of the Ukrainian Research Centre of Ecology of Sea (UkrRCME). The investigation has shown that at known prevailing of particulate organic matter over abundance of structural elements of seston, seasonal changes in its content in the open sea agreed with seasonal changes in the abundance of plankton organisms; sedimentation rate of organic particles in photic zone was high and is driven by the hydrodynamic activity.
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