An algorithm for calculating the concentration of phytoplankton in a stratified sea with respect to the daily migration of zooplankton. Part 1. P–V–Z–D model

This paper presents a nutrient-phytoplankton-zooplankton-detritus biological model with a fully-developed regeneration mechanism with respect to the daily migration of zooplankton. The P-V-Z-D model consists of two partial differential equations of the diffusion type for the concentration of nutrients and phytoplankton, and two ordinary differential equations for the concentration of zooplankton and the benthic detritus pool, together with initial and boundary conditions.