The effect of the turbulent mixing processes within fine structure of hydrophysical field on the prey and predator biomass is presented. The calculations were made on the basis of an one-dimensional prey-predator ecosystem model on the assumption of an absolutely stable vertical distribution of the average sea water density and that vertically intermittent layer are horizontally homogeneous. This model was tested with data obtained from the southern Gdansk Gulf (Baltic Sea). The vertical distributions of temperature and salinity fields were taken as initial conditions for various simulations. The numerical simulations were computed for different values of the wind speed. This study reveals that an intensity of the layer-mixing increase with the increase of the wind speed and duration of the turbulent disturbance. For low values of wind speed (U₁₀ < 2 m s⁻¹) and for short time of action of hydrodynamic sources of mixing (tₜ < 60 min.), fine-scale interlayering is not created in investigated case. It is also shown that the thicker the layer, the smaller the structural anomaly. The presented results demonstrate that the dynamic processes are responsible for the shape of vertical profiles of investigated characteristics to the same extent as physiological processes. Hydrodynamic conditions play a basic role where the microstructure of investigated functions is concerned.
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