In subarctic saltmarshes, the addition of phosphorus has no effect on productivity but additional nitrogen will increase productivity. In this example, nitrogen is a

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In ecosystems, a limiting factor is a resource that is most scarce relative to the needs of organisms and thus limits the growth and productivity of the ecosystem. Since adding nitrogen (but not phosphorus) increases productivity in subarctic saltmarshes, nitrogen is the limiting factor for productivity in these ecosystems.

In Subarctic Saltmarshes, the Addition of Phosphorus Has No Effect