Table 3. Most influential variables for simulated parameters (in decreasing order).

Food	NH${}_4^{+}$	NO${}_2^{-}$	NO${}_3^{-}$	Org N	Total N
Temperature	Mussel excretion rate	NH${}_4^{+}$ to NO${}_2^{-}$ rate	Temperature	Water depth	Temperature
Mussel biomass	Mussel biomass	NO${}_2^{-}$ to NO${}_3^{-}$ rate	Hydraulic retention time	Org N settling rate	Mussel biomass
Hydraulic retention time	Nitrification rate	Temperature	Nitrification rate	Hydraulic retention time	Mussel excretion rate