On the selection of a model class for describing non-homogeneous biosystem

The paper deals with the relationship between box, diffusion and integral model. We have shown that an integral model reduces to a diffusion one if a community to be modelled is weakly non-homogeneous (i.e. the size of space non-homogeneity is much large than the sizes of individuals and the radius of their activity). The paper gives examples of integral description of various processes in biological communities and studies of integral models.