A LABORATORY STUDY OF THE EFFECT OF REMOVAL OF NEW BORN ANIMALS FROM A POPULATION

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Abstract
If Daphnia are maintained in the laboratory under conditions of constant temperature and constant food ration, a characteristic pattern of population fluctuations is observed. Population size at any temperature is determined exclusively by food increment. If a constant proportion of newborn are removed from such self-regulating populations of Daphnia, population size and yield are predictable from simple equations requiring only knowledge of normal population size and 1 conversion constant. When adult animals are removed, destroying the simple food dependence of the population, these equations are no longer applicable.