A computer simulation was used to investigate the relative effects of changes in net fecundity and development time on population growth rate ( r ). Increases in net fecundity had the largest effect on r when net fecundity is small. Conversely, decreases in developmental time had the largest effect on r when net fecundity was large. The intersection point where similar changes in developmental time, and net fecundity had equivalent effects on r was also investigated in four organisms with very different life histories. Cases were considered where changes in net fecundity and developmental time are correlated and different results were obtained.
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