BIOMASS DYNAMIC AND PRODUCTIVITY OF ECOSY STEMS OF CONTINENTAL WATER BASINS

Biomass dynamics variability (BDV) of phytoplankton, zooplankton and z oobenthos has been studied in 134 continental water bodies located on various continents and at different latitudes. BDV was estimated as th e ratio of minimum to maximum biomass value observed during the year. BDV is shown to increase in parallel to the volume of water body and v ariability of the temperature. BDV is connected also with the primary production of water basins. The lowest BDV values are observed at lati tudes about 10 degrees and 60 degrees, while the highest ones - close to 30 degrees. BDV values reflect the degree of complexity of communit ies or ecosystems. Index of endurance is suggested which prove to be l ow in water basins with stable conditions. It is shown that the produc tivity of water basins can increase only in parallel to the increase i n the environmental variability, e.g. temperature conditions.