I observed higher ammonium concentration in a floated-farm of seaweed (Porphyra yezoensis: Nori) than a control area. There was no river discharge and drain ditch, and water depth and sediment condition were almost the same. Did seaweed release NH4 into ambient water?
Porphyra indeed contains substantially higher protein content than any other seaweeds. I have no clue whether there is relation between and protein and NH4 concentration. I know higher the nitrogen in seawater greater the protein in Porphyra. What do you mean by control area? An area without seaweed cultivation?
Yes, the control area is non-cultivation area.
The nitrogen concentration was very low. NOx was around 0.6 micro M in both area. NH4 was around 1.0 and 3.5 micro M in control and cultivation area, respectively.
As seaweed cultivation attracts fish and other marine animals (you can see our 2015 paper in Aquaculture here in RG) you may be having a case of NH4 from animal feces.
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