A DYNAMIC-MODEL OF THE PELAGIC ECOSYSTEM OF THE KARA SEA

Based on the literary data and integral materials obtained during the 49th Cruise of the R/V Dmitry Mendeleev (September, 1993), mathematica l model of the pelagic ecosystem of the Kara Sea functioning was devel oped and verified. The model calculations allow to describe seasonal d ynamics in the North and South-West Kara Sea of the following main eco system elements: phytoplankton, bacteria, protozoans, small zooplankto n, large euryphagous animals and predators, as well as autochthonous d etritus and dissolved organic matter. The performed model experiments on the estimation of the influence of the organic matter carried in by the Yenisei River discharge have shown that the great bulk of zooplan kton makes up for approximately a half of its ration with the suspensi on brought by the river and that it is impossible to equalize the biot ic annual balance of the marine ecosystem without taking into consider ation the allochthonous organic matter of the rivers discharge. The co mparison of the calculated and in situ parameters showed that the meas ured magnitudes appeared to be mainly in the range of the values confi ned by the calculated curves for the late-summer state of the ecosyste m.