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Chemical measurements corresponding to sequenced filters (site numbers noted in X-axis). (A) Methane, (B) sulfide, (C) pH, (D) magnesium, (E) manganese, and (F) silica concentrations are arranged by habitat type; green—seawater (SW), blue—intra-field (Int), and yellow—diffuse flow (Dif). Note than Mn and Si were not measured at Site 2.
