Damped oscillation of population density at equilibrium

Summary It has been theoretically assumed that the population density at the equilibrium oscillates with damping from generation to generation. In the adult population of the southern cowpea weevil, Callosobruchus maculatus , it was exemplified. But, it was not so clear in the adult population of the azuki bean weevil, C. chinensis as seen in that of C. maculatus . This difference seems to be due to the scramble type of competition that occurs in larval stage in C. maculatus , instead of in the egg stage as C. chinensis . Comparing with the oscillation from generation to generation obtained in the present experiment to that of Lucilia population found by Nicholson , the oscillation in Lucilia population is composed of the cycle in a generation and the descending phase of each cycle of it is not regulated density‐dependently. The present result seems to be more appropriate for the demonstration of the theory of self‐adjustment of population.