EliScholar – A Digital Platform for Scholarly Publishing at Yale
Abstract
In studying the relation of an animal population to its environment it must always be remembered that the population forms part of its own environment. This is due mainly to the influence its size has upon the other elements, both physico-chemical and biotic, of the environment. Allee ( 1931) in his discussion of the harmful effects of crowding upon growth separates the growth retarding factors into two groups namely, the vague and the definite...