Abstract
The evolution of a population of organisms will be dependent upon the ecological circumstances in which it lives. It has been suggested that organisms in constant environments will be subject to natural selection acting to influence their equilibrium population density, but in organisms in temporally variable environments natural selection will act more on differences in rates of increase in population size. These two types of selection have been called r- and K-selection. A quantitative relationship between the optimum genotype of an organism and environmental variability is calculated, and shown to depend upon the trade-off between evolutionarily possible values of r and K.
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