Abstract
The idea put forward by Dobzhansky (1950) that tropics and temperate zones are areas where selection operates differently generated fruitful lines of thinking and research. His contention was that in temperate areas mortality was essentially climatically determined, with little or no competition pressure, while in the tropics, where the environment is relatively more constant, mortality is the result of the effects of population size. In the first case, high fecundity and short developmental time are favored by selection, while in the latter selection would favor competitive ability through lower fecundity and longer developmental time, increasing overall fitness by allocating more energy into each individual but producing fewer offspring.
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