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Table 3

Linear models explaining the total biomass. The models result from a stepwise selection procedure using the independent factors: temperature, pH, conductivity, turbidity, dissolved oxygen, total nitrogen, ammonium, nitrite, nitrate, total phosphorus, permanganate index.

Total biomass Parameters included n P
All data CODMn, T, NH4–N, tur, pH, NO3 383 <0.001 0.198
Data averaged by site NH4–N, tur, pH, cond 96 <0.001 0.285
Spring CODMn 96 0.006 0.066
Summer Cond, NO3–N, CODMn, NH4–N, TP, pH 96 <0.001 0.393
Autumn NH4–N, DO, pH, tur, TN, cond 96 <0.001 0.477
Winter DO, NH4–N, pH, tur 95 <0.001 0.311