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Limiting Factors Of all abiotic and biotic factors that affect a population only one affects the population and limits its growth. This is known as the limiting factor. The factor may be too less in quantity or too much. For example, the limiting factor for a plant population near a chemical factory may be the soil pH. Range of Tolerance Every population thrives in an optimal range of abitoic factors. Beyond this range, one finds less and less numbers of these organisms. In an ecosystem, it is harder to represent what this optimal range is, since a host of factors affect the survivability of this population. Often, the range is shown for each factor, and this is known as the range of tolerance.
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