Some aspects of non-linear studies in some population models

The authors have studied the joint effects of migration and mortality function on a density dependent female population under the assumption that the mortality function depends implicitly on time. The characteristics of the population has been investigated under various functional forms of migration function, total population and mortality function. When the population and mortality is a decreasing function of their arguments and the migration is one kind of emigration then the profile of the female population is a straight line.