ESTIMATION OF PRODUCTIVITY OF EPIPLANKTON IC COMMUNITIES AND STOCKS OF THE MAIN GROUPS OF PLANKTON IN ULTRAOLIGOTROPHIC WATERS OF NORTH-ATLANTIC GYRE DURING SPRING-AUTUMN PERIOD WITH USE OF FIELD DATA AND REMOTE-SENSING OBSERVATIONS

On the basis of the analysis of data on mesoplankton, collected in ult raoligotrophic waters of North-Atlantic anticyclonic Gyre (cruises 34 and 39 of R/V ''Akademik Mstislav Keldysh'', 1994, 1996) the measured values of biomass of small (less than or equal to 3 mm) and large (> 3 mm) mesoplankton were compared with the ones calculated by two method s: from average values for waters of different productivity level eval uated by remote sensing, and from regression equations between mesopla nkton concentration and primary production and water transparency, mea sured by Secchi disk. The measured and calculated values are shown to be similar. It allows the calculated values of ecosystem characteristi cs to be used for evaluation the stocks of planktonic organisms, their production, destruction, destruction, etc., in the quasi stable regio ns of the ocean. In dynamically active waters (frontal zones and coast al regions) use of calculated values can result in displaced estimatio ns.