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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Limnol Oceanogr Bull. 2019;28(1):26–30. doi: 10.1002/lob.10293

FIG. 2.

FIG. 2.

(A) Number of U.S. states using particular measures of N and P in developing numeric nutrient criteria (out of 17 states with river and stream criteria). N0x = N02− + N03−. TIN = total inorganic nitrogen. TKN = total Kjeldahl nitrogen. See more details in Table 1. (data from https://www.epa.gov/nutrient-policy-data/state-progress-toward-developing-numeric-nutrient-water-quality-criteria). (B) Number of experimental studies reporting particular measures of N and P in response to nutrient addition (out of 100 studies examined). Mol/other = molar concentration, molar ratio, and other measures.