[Spatially heterogeneous distribution of phytoplankton in a model of a regulated population]

With the help of the mathematical model is shown that the existence of the phitoplankton's mechanism of growth-speed regulation by means of excretion to the environment of biologically active substances, may lead to a considerable inhomogenity of it's spatial distribution, that is, patchness. There appears an intensive crowding of phitoplankton with homogenious distribution of nutrients, while some limitations of excretion rate and of dispersion coefficients are taken into account.