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Fig. 8. Seasonal relationship between total phenolic concentration and proportion of 18:1 ${omega}$ 7c/ ${omega}$ 9t/ ${omega}$ 12t and 18:1 ${omega}$ 7t fatty acid methyl esters (FAMEs) in the two-stage first phototrophic lagoon (TS1PL). Total phenolics is the summation of phenol, p-cresol, 4-ethyl phenol, and the indoles. 18:1 ${omega}$ 7t ( ${blacktriangledown}$ ), 18:1 ${omega}$ 7c/ ${omega}$ 9t/ ${omega}$ 12t (•), and total phenolic concentration ( ${square}$ ). Similar profiles were observed for the two-stage second phototrophic lagoon (TS2PL) and single-stage phototrophic lagoon (SSPL).