The ecologist can manipulate the nutrient supply to understand the factors that limit the growth of the primary producers.
Limiting elements in the ecosystem, such as temperature, moisture, nutrients, and light, have an impact on the primary producers' ability to generate food. When considering aquatic ecosystems, the phosphorus and nitrogen nutrient contents as well as light are limiting factors for primary production.
While in the terrestrial environment, primary production is also significantly influenced by temperature and moisture. The amount of phosphorus in the soil affects production rate as well, therefore an ecologist can measure production growth unless other parameters are constrained.
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