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. 2014 Apr 22;9(4):e96065. doi: 10.1371/journal.pone.0096065

Figure 2. Example chlorophyll a response patterns.

Figure 2

These patterns correspond to a subset of the nutrient limitation categories defined by Harpole et[37]. A) Single N limitation: a response to only one of the single treatments, in this example +N and the response to the +NP treatment is no different. B) Serial P limitation: a response to only one of the single nutrient treatments, in this example +P and a larger response to the +NP treatment. C) Independent co-limitation (primary P): a response to both single nutrient treatments with a larger response to +P and an even larger response to the +NP treatment; D) Simultaneous co-limitation: a response only to the +NP treatment.