We consider a system of two degenerate parabolic equations with nonlocal terms and
Dirichlet boundary conditions. More precisely, the degeneracy in each equation of the …

We deal with a degenerate model describing the dynamics of a population depending on
time, on age and on space. We assume that the degeneracy can occur at the boundary or in …

The existence of positive equilibrium solutions to age-dependent population equations with
nonlinear diffusion is studied in an abstract setting. By introducing a bifurcation parameter …

In this paper, we deal with the null controllability of a population dynamics model with an
interior degenerate diffusion. To this end, we proved first a new Carleman estimate for the …

We study the fish population model integrating age and weight structures, introduced in E.
Sánchez, ML Hbid, R. Bravo de la Parra.(J. Evol. Equ. 14: 603–616, 2014). We reformulate …

We consider the well-posedness of models involving age structure and non-linear diffusion.
Such problems arise in the study of population dynamics. It is shown how diffusion and age …

In the present paper, we address the asymptotic behavior of a fish population system
structured in age and weight, while also incorporating spatial effects. Initially, we develop an …

In this paper, we discuss the qualitative behavior of an age/size-structured population
equation with delay in the birth process. The linearization about stationary solutions is …

We consider a diffusive p-logistic equation in the whole of ℝN with absorption and an
indefinite weight. Using variational and truncation techniques, we prove a bifurcation …

In this paper, we investigate a size-structured population model of Daphnia coupled with an
unstructured algal food source. We introduce a delay into the boundary condition of this …