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Changes in nutritional types in bacterial successions.

In a succession in which three bacteria having different nutritional needs were inoculated simultaneously into a medium with no added growth factors, the fastidious population developed only after an initial period of growth by bacteria with simple nutritional demands. In a model succession of soil bacteria inoculated into a glucose–salts medium, the relative abundance of cells requiring no growth factors declined with time, while bacteria needing growth factors made up an increasing percentage of the community in late stages of the succession.