A limiting factor causes a population to decrease in size. A few limiting factors are food, shelter, water, space. These are not all limited to the condition of the species. Somefactors may be increased or reduced based on circumstances. An example of a limiting factor is sunlight in the rain forest, where growth is limited to all plants in the under story unless more light becomes available. This decreases plants photosynthesis.
A number of potential factors could influence a biological process, but importantly only one is limiting at any one place and time. This recognition that there is always a single limiting factor is vital in ecology; and the concept has parallels in numerous other processes.
Some other limiting factors in biology are water availability, temperature, shelter, or predatation. See Liebig's Law.
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