Ocean ecosystem models in discrete-time

In this talk we consider the discrete -time ocean ecosystem generated by 2-Volterra operator, consisting of phytoplankton, zooplankton, and nitrogen. In addition, we initiate the study of a discrete-time dynamical system modeling a trophic network connecting three types of plankton (phytoplankton, zooplankton, mixoplankton) and bacteria. For each operator it was studied type of fixed points, their local and global stability.