NON-EQUILIBRIUM FLUCTUATIONS IN A STOCHASTIC PLANKTON MODEL : PERIODICITY OF PHYTOPLANKTON BLOOM

摘要

A stochastic model describing the planktonic interaction is presented. The environmental fluctuations are incorporated by perturbing the growth rate of phytoplank-ton and death rate of zooplankton with coloured noises. Spectral density functions are studied and statistical linearization technique is used to show the unstability and periodicity of the model system indicating the cyclic nature of bloom.