Nutrient concentrations. Phosphate (A, B), ammonium (C, D), nitrate plus nitrite (E, F), and silicic acid (G, H) concentrations in surface water (5 m) (A, C, E, G) and at 25-m depth (B, D F, G) at station M and G during June 2015. Surface nutrient concentrations at station M are from two individual water samples; other measurements, from a single sample. Note the difference in scale between panels A, C, E, and B, D, F. DOI: https://doi.org/10.1525/elementa.307.f3