Also includes changes in access to these species and competition among species that build and those that are used as materials for construction. Spatial and Functional Structure of Populations Beklemishev, V.N. 1960. Spatial and Functional Structure of Populations. Population is a set of conspecific individuals which interact with each other and inhabit the same area which is more or less isolated from areas occupied by other populations of the species. Differentiation of population is usually a result of the heterogeneity of environment.
Migration occurs in both differentiated and non-differentiated populations.
However, in differentiated populations it is less intensive. Can persist without any immigration, and its numbers do not depend on immigration. Semi-dependent populations . Can persist without any immigration, however, its numbers depend on immigration. If there is no immigration, then the abundance is much lower than in the presence of immigration Dependent populations .