Table 4 Principal component matrix of surface water variables in the two lagoon systems.

pH

0.867

0.169

0.183

− 0.042

0.900

0.255

0.048

Temperature

− 0.808

− 0.440

− 0.219

− 0.056

− 0.905

− 0.085

0.162

DO

− 0.500

− 0.709

0.238

0.119

− 0.920

− 0.276

− 0.068

Salinity

0.880

0.355

− 0.057

0.004

0.931

− 0.212

0.023

TSS

− 0.860

− 0.380

0.137

− 0.161

− 0.960

0.019

0.079

BOD

− 0.120

− 0.007

− 0.058

0.959

− 0.904

0.065

0.000

EC

0.058

− 0.188

− 0.907

− 0.259

0.988

0.092

0.037

COD

0.179

− 0.378

0.493

0.645

− 0.989

− 0.091

− 0.064

TDS

− 0.829

− 0.527

0.093

− 0.078

− 0.069

0.941

− 0.137

Alkalinity

0.160

− 0.109

0.945

− 0.172

0.804

− 0.050

0.556

Cd

0.342

0.887

0.026

0.043

0.717

0.315

0.319

Cu

0.302

0.876

− 0.041

0.174

0.816

− 0.079

− 0.472

Cr

0.397

0.831

0.068

0.037

0.792

− 0.133

− 0.455

Fe

0.396

0.416

0.060

0.689

0.672

− 0.536

0.041

Pb

0.850

0.197

0.363

− 0.024

0.729

− 0.152

0.294

Ni

0.301

0.781

0.064

− 0.069

0.729

0.077

− 0.411

Zn

0.696

0.634

0.202

− 0.016

0.899

− 0.106

− 0.107

As

0.826

0.376

− 0.141

0.225

0.912

0.099

0.230

Variance

55.291

14.580

10.230

8.1795

70.282

8.684

6.816

Total variance

55.291

69.870

80.100

88.280

70.282

78.966

85.782

KMO sampling adequacy

0.672

Bartlett’s Test of Sphericity (Sig)

0.001