Abstract
There is considerable current interest in plankton population distribution and movement in the sea. We consider two models with two different types of plankton between which there exists a predator-prey relation. Denoting by $U(t,x) = (u_1 (t,x),u_2 (t,x))$ the densities of the plankton populations at time t and position $x \in \mathbb{R}^r $, we assume that $U(t,x)$ satisfies a certain semilinear parabolic system. This system is treated as a mixed initial-boundary value problem with zero Neumann boundary conditions. Results concern the asymptotic behavior of the solution for large time.
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