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All issues Volume 57 (2021) Ann. Limnol. - Int. J. Lim., 57 (2021) 1 Full HTML
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Table 2

Correlations between cyanobacterial abundance (Dolichospermum flos-aquae and Microcystis aeruginosa), microcystin-LR (MC-LR) concentration, and environmental factors (surface water temperature- T; water hydrogen potential- pH; secchi disk depth- Secchi; dissolved oxygen- DO; nitrate- N-NO3 –; nitrite- N-NO2 –; ammonium- N-NH4 +; dissolved inorganic nitrogen- DIN; dissolved phosphorus- P-PO4 −3 (DIP); total phosphorus- TP; DIN:TP ratio- DIN/TP; iron- Fe; chlorophyll a- Chl-a in the Foum-Gleita reservoir (Mauritania). The significance of the correlation coefficients (Pearson's r) is indicated by *0.01 < p < 0.05, **0.001 < p < 0.01, and ***p < 0.001.

  T pH Salinity Secchi DO N-NO3 – N-NO2 – N-NH4 + DIN P-PO4 −3 (DIP) TP DIN/TP Fe Chl-a MC-LR
T 1                            
pH −0.220 1                          
Salinity 0.060 −0.340 1                        
Secchi −0.290 −0.406 0.300 1                      
DO −0.290 0.320 0.230 0.150 1                    
N-NO3 – 0.434* −0.431 0.290 0.170 −0.394 1                  
N-NO2 – 0.460 −0.402 0.250 0.160 −0.417 0.936*** 1                
N-NH4 + 0.355 −0.442 0.250 0.120 −0.460 0.973*** 0.962*** 1              
DIN 0.440 −0.433 0.290 0.170 −0.398 0.960*** 0.940*** 0.975*** 1            
P-PO4 −3 (DIP) −0.408 0.401 −0.160 0.020 0.413 −0.723* −0.760** −0.731*** −0.725** 1          
TP −0.353 0.432 −0.190 0.010 0.300 −0.697** −0.724** −0.690** −0.698** 0.983*** 1        
DIN/TP 0.551* −0.651* 0.290 0.130 −0.418* 0.961*** 0.933** 0.970*** 0.963*** −0.786** −0.752** 1      
Fe 0.431 −0.404 0.160 0.010 −0.384 0.864* 0.883 0.898 0.867 −0.813 −0.781 0.869* 1    
Chl-a 0.230 −0.110 0.180 0.050 −0.450* 0.454** 0.443** 0.426** 0.454** −0.394* −0.408* 0.431** 0.455** 1  
MC-LR 0.466* −0.180 0.090 0.030 −0.100 0.468 0.528* 0.505* 0.471* −0.422* −0.409* 0.498* 0.574*** 0.891*** 1
D. flos-aquae 0.210 0.493* −0.130 −0.220 0.080 −0.567* −0.581* −0.491* −0.565* 0.673** 0.694** −0.504** −0.478* −0.310 −0.190
M. aeruginosa 0.474* −0.553* 0.050 −0.050 −0.464** 0.585** 0.750*** 0.693** 0.592** −0.482* −0.421* 0.630** 0.671*** 0.434** 0.606***

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