Table 7.

Results of principal component analysis obtained for physicochemical and hydromorphological variables at the sampling locations

Variable	PC1 (34%)	PC2 (18%)	PC3 (12%)
DO (% saturation)	− 0.072	− 0.06	0.231
pH (pH units)	0.141	− 0.081	− 0.295
Temperature (°C)	0.022	− 0.001	− 0.444
Conductivity (μS cm−1)	0.115	0.02	0.333
BOD	0.138	0.025	− 0.024
NH3-N (mg L−1)	0.045	0.081	0.42
NO3-N (mg L−1)	0.304	0.008	− 0.259
PO4-P (mg L−1)	0.318	− 0.007	− 0.208
Suspended solids (mg L−1)	0.148	0.18	0.185
Discharge (m3 s−1)	0.212	0.116	0.451
Catchment area (miles2)	0.372	0.071	− 0.001
Boulders (%)	− 0.007	0.485	− 0.074
Stones (%)	− 0.168	0.474	− 0.071
Pebbles (%)	− 0.356	0.124	− 0.055
Gravel (%)	0.136	− 0.098	0.077
Sand (%)	0.15	− 0.445	0.05
Silt (%)	− 0.144	− 0.487	0.059
Altitude (m)	− 0.368	− 0.051	0.008
Slope (%)	− 0.364	− 0.061	0.002