Figure 3
From: Tidal variability of water quality parameters in a mesotidal estuary (Sado Estuary, Portugal)
Tidal variability of the total oxidized nitrogen (NOx), ammonium (NH4+), dissolved inorganic nitrogen (DIN), phosphates (PO43−), silicate (Si(OH)4) and nitrogen-phosphorus ratio (N/P) observed during the sampling campaigns in neap tide and spring tide conditions. All data were collected at the surface of the water column. The tidal height is represented in grey dashed lines. Yellow dashed line represents the N:P Redfield ratio (16). Blue and orange arrows correspond to unusual higher values of PO43− obtained at station B and C, respectively. Sampling stations are colored as follows: A—blue, B—brown, C—green and D—red. The figure was produced using PRIMER 6 (6.1.16) + PERMANOVA (1.0.6) software from PRIMER-e (https://www.primer-e.com/).
